The universal screw cutter LT-10 is one of the easiest to operate, high-precision, reliable and economical tools that our craftsmen love.

The machine was produced at the Ivanovo machine-tool plant in the Luhansk region. Currently discontinued and buy the machine can only be hand-operated - from companies and individuals.

The most popular platform for searching for goods by ads is the Internet site Avito. Here you can even find brand new machines, somehow preserved by the owners. But it's best to look at boo copies.

LT-10 is wear-resistant equipment, its quality mostly does not suffer from time. And here price for used machines is significantly lower than the original.

Passport provides for the following turning operations:

Turning of metal and wooden blanks,

Boring of inner diameters of workpieces,

Centering and drilling holes,

Cutting modular, inch, metric external and internal threads,

Finishing grinding and polishing of finished cylindrical products.

- easy to place in any cramped environment:

home environment,

workshop,

They are very popular in service stations for the manufacture of spare parts for rare car models.

Advantages:

Affordable price;

High precision machining of parts;

Easy to install blanks, cutters;

Ease in performing turning operations provided for in the passport;

Reliability of electrical and mechanical components;

Reliability in operation

Ease of maintenance

Safety,

Economical electricity consumption.

The distance between the chuck and the caliper is 960 mm, which allows processing large enough parts.

Device

LT-10, like any lathe, consists of the following structural units:

1. Beds with headstock
2. Spindle with chuck
3. Tailstock
4. Electric motor and other electrical equipment connected according to a special electrical circuit
5. Protective apron

Bed with headstock

The assembly consists of a cast-iron table and two rails for attaching the headstock and tailstock.

The accuracy of processing the part depends on the quality of the milling and grinding of the guides, as well as their alignment in the horizontal and vertical planes.

Before
The headstock is installed on the left side of the bed. Structurally, it is a gearbox with a central shaft, the outer part of which (spindle) has a thread for mounting the cartridge.

Gears of different diameters, driven by a guide gear, allow you to adjust the rotation speed. The number of revolutions is set using handles mounted in the front plane of the headstock.

On a plate attached next to the knobs, a diagram is drawn showing the positions corresponding to a certain number of spindle revolutions. A cam or driver chuck is screwed onto the thread of the latter to fasten the workpiece.

Spindle with chuck

The spindle is the master node. All other mechanisms are only serving. The shaft is made of high quality alloy steel, it is strong and extremely wear resistant. Inside the spindle is a conical bore. It can be attached to:

mandrels,

Front centering of the part,

Reamers

A complete list of tools is indicated in the passport.

On the outer part of the spindle there is a left-hand thread with a groove for a chuck or faceplate. The groove prevents the chuck from curling up when the shaft stops abruptly.

High-quality and high-precision processing of the part is possible only with the full serviceability of this device.

Spindle quality requirements:

Correct shaft rotation

No axial and radial play in bearings,

Density of threaded and conical connections,

Correspondence of repair bearings with shaft speeds (for high frequencies, not plain bearings are more reliable, but their ball and roller version).

In addition, the quality of workpiece processing is affected by the mobility and wear of the jaws in the chuck. Otherwise, clamping is uneven and the workpiece vibrates.

tailstock

The mechanism is designed to stop and maintain the workpiece in the horizontal axis. It is mounted on rails and has a conical center built into the quill that rotates with the part.

Axial force is provided by a ball-type thrust bearing.

The tailstock also includes:

Locking device, if necessary, blocking the rotation of the quill;

The possibility of shifting the quill transverse to the bed for processing workpieces with a cone of a flat design.

In addition to the center, reamers, taps, drills, countersinks and other devices can be attached to the quill.

This device has its own guide plane mounted perpendicular to the longitudinal axis of the table.

It is a mechanical carriage with two thick steel plates (tool holders), between which the cutter is clamped.

The change of incisors is carried out with the help of a handle, expanding and compressing the plate.

Due to the design of the caliper, the tool holder (carriage), together with the cutters installed in it, can move in two planes with respect to the frame guides:

Longitudinal - along guides perpendicular to the frame (sled);

Transverse - along the guides of the bed.

It is possible to move the caliper in an inclined plane (at any angle). In this case, special conical "slides" are installed on the guides.

The tool holder can clamp from one to four cutters at the same time. This makes it possible to quickly change the processing modes of the part. The cutter is set between the clamping plates and firmly fixed with a handle with a clamping bolt.

The most popular incisors:

1. Checkpoints

Direct (surface treatment of metal),

Bent (chamfering, end processing),

Bent thrust (machining cylindrical parts)

1. Cutting cutter (cutting the workpiece to size).

electrical equipment

The main unit that provides the mechanical drive of the machine to the rotation mode is an asynchronous DC motor.

Direct current provides stepless speed control in the gearbox.

The motor frame is made of low-carbon steel, which excludes the magnetic conductivity of the assembly and the corresponding induction pickups from the side of the magnetically conductive frame.

An inductive power divider connected to the stator winding makes it possible to provide a given number of revolutions, which then

differentiated by the gears of the gearbox.

The combination of the engine and gearbox is carried out by means of pulleys on both devices and a drive belt.

The operation of electrical equipment is ensured by the following scheme:

Specifications

Machining accuracy class (GOST 8-82) - H

The maximum diameter of the workpiece for processing:

Above bed - 400 mm

Above the recess in the frame - 540 mm

Above the caliper - 250 mm

The maximum longitudinal size of the workpiece - 960 mm

Taper spindle size - No. 5

Largest Diameter:

Cone in spindle - 38 mm

The bar inserted inside - 36 mm

The maximum range of frequencies of rotation of the spindle shaft - from 28 to 1000 rpm

The number of steps on forward and reverse turns of the spindle - 12

Main characteristics of the spindle:

External thread marking at the end - M68

Brake mechanism

Rotation lock when shifting gears

Characteristics of the movement of the caliper in mechanical mode (limb):

Transverse stroke (maximum) - 235 mm (per division of the limb - 1 mm)

Longitudinal stroke (maximum) - 120 mm (per division of the limb - 0.02 mm)

The maximum longitudinal travel of the caliper during manual movement - 875 mm

Longitudinal movement of the tool holder by one division of the limb - 0.05 mm

Characteristics of the caliper feed on limbs:

Longitudinal - 38 divisions (tolerance - 0.03 - 2.91 mm)

Transverse - 38 divisions (tolerance - 0.03 - 2.6 mm)

Threaded characteristics:

Metric thread pitch (range) - 0.4 - 10 mm

Inch pitch - 3 - 48 mm

Modular thread pitch - 0.25 - 5 mm

Tailstock Specifications:

The maximum extension of the quill - 85 mm

Type of an internal cone - M No. 24

Electrical equipment:

Electric motors - 3 pcs.

Drive motor power - 2.2 kW

Power of the cooling electric pump - 0.125 kW

Power of the electric drive for the grinding device - 0,7 kW

Dimensions (mm):

Length - 2160

Width - 1000

Height - 1400

The total weight is 1000 kg.

Conclusion

Universal LT-10 is a multifunctional, precise and reliable equipment. With proper care, it can last a very long time, even if you buy it as a used one. Numerous favorable reviews from the owners of the unit testify to this.

The equipment does not require much space.

Repair of worn components is very simple - all components are easy to find in any mall specializing in electrical. Some mechanical spare parts can be made directly on the machine itself.

The total cost of maintaining and purchasing equipment is negligible compared to the benefits that it can bring.

The demand for turning products for individual orders is very high, to be convinced of this, it is enough to place your offers on the website Avito.

Video:

Universal screw-cutting lathes LT-10, LT-10M, LT-10S, LT-11, LT-11M, LT-11S were produced at the enterprise Ivanovo Machine Tool Plant in the village of Ivanovka, Luhansk region, Ukraine.

The LT-10 machine replaced the outdated DT-10 screw-cutting lathe.

LT-10 Universal screw-cutting lathe. Purpose and scope.

Lightweight universal screw-cutting lathes of the LT-10, LT-10M, LT-10S, LT-11, LT-11M, LT-11S models are designed to perform a wide variety of turning operations in centers or a chuck and for threading: metric, inch and modular.

Lightweight screw-cutting lathes and LT-11M were designed for use in mobile repair shops, such as KUNG (Today, KUNG is called any insulated booth on a car or trailer).

The LT-10 lathe fits into the DIP-200 size and is capable of processing medium and small disc-type parts with a diameter of up to Ø 540 mm above the recess in the frame and shaft-type parts up to Ø 250 mm above the upper part of the support.

Main technical characteristics of the screw-cutting lathe LT-10 (LT-11)

Manufacturer - Ivanovo Machine Tool Plant, Ivanovka, Ukraine.

The main parameters of the machine are in accordance with GOST 18097-93. Screw-cutting and turning machines. Main dimensions. Accuracy standards.

• The largest diameter of the workpiece type Disc, machined over the bed - Ø 400 , mm
• The largest diameter of the workpiece type Shaft, machined over the caliper - Ø 250 mm
• The largest turning diameter above the notch - Ø 540 mm
• Distance between centers - 960 (1400) mm
• Maximum turning length - 875 (1315) mm
• Motor power - 2.2 kW, 1430 rpm
• Full machine weight 1 (1,2) T

Spindle of the screw-cutting lathe LT-10 (LT-11)

• Spindle End - Threaded M68
• Tool cone - cone Morse number 5
• Spindle hole diameter - Ø 38 mm
• The largest diameter of the processed bar — Ø 36 mm
• Spindle RPM Limits (12 steps) - 28..1000 rpm
• Standard chuck diameter - Ø 250 mm

Feeds and threads of the LT-10 (LT-11) screw-cutting lathe

• Limits of longitudinal feeds: (38 steps) - 0,03..2,91 mm/rev
• Limits of transverse feeds: (38 steps) - 0,03..2,60 mm/rev
• Metric thread pitch limits - (24 steps) 0,4..10 mm
• Inch thread pitch limits - (33 steps) 3..48 threads per inch
• Limits of pitches of modular threads - (25 steps) 0,25..5 modules

Machine accuracy class H.

Surface roughness V6.

By special order, for a fee, the following are supplied: a device for milling small planes, a device for external and internal grinding, a conical ruler and a movable square.

Machine tools LT-10M and LT-11M are intended for use in mobile repair shops, and LT-10S and LT-11S - for use in stationary conditions in individual production.

The universal screw-cutting lathe LT-10 differs from the LT-11 machine by an increased center distance. LT-10 has RMC = 960 mm, LT-11 has RMC = 1400 mm.

Overall dimensions of the working space of the LT-10 screw-cutting lathe

Landing and connecting bases of a screw-cutting lathe

General view of the LT-10 screw-cutting lathe

The location of the components of the lathe LT-10M, LT-11M, intended for use in mobile repair shops

List of components of the lathe LT-10M, LT-11M

1. Machine bed

1. Reducer

1. Headstock
2. guitar shroud

1. cone ruler
2. Gearbox
3. Apron
4. caliper

1. Steady rest
2. Steady rest

1. Movable square
2. tailstock

1. Cooling

1. Milling fixture
2. grinding attachment

1. electrical equipment

List of controls for lathe LT-10M, LT-11M

1. Handle for setting the amount of feed and thread pitch
2. Spindle speed setting knob
3. Feed cone handle
4. Handle for turning on, stopping and reversing the main drive
5. Spindle speed setting knob
6. Tailstock mounting nut
7. Handle for turning on, stopping, reversing and blocking the main drive
8. Coolant pump switch
9. Line switch

The location of the controls of the lathe LT-10S, LT-11S, intended for use in stationary conditions

List of components of the lathe LT-10S, LT-11S

1. Machine bed
2. Spindle speed switch

1. Reducer
2. guitar shroud
3. Headstock

1. cone ruler
2. Gearbox
3. Apron
4. caliper

1. Steady rest
2. Steady rest

1. Movable square
2. tailstock

1. Cooling

1. Milling fixture
2. grinding attachment

1. electrical equipment
2. Electrical cabinet

List of controls for the lathe LT-10C, LT-11C

1. Local lighting switch
2. Coolant pump switch
3. Sander switch
4. Stop button
5. Handle for setting the amount of feed and thread pitch
6. Feed Direction Change Lever
7. Handle for setting the amount of feed and thread pitch
8. Spindle speed setting knob
9. Feed cone handle
10. Handle for turning on the lead screw or lead shaft
11. Spindle speed setting knob
12. Handle for turning on, stopping, reversing the main drive
13. Spindle speed setting knob
14. Handwheel for manual movement of the caliper
15. Handle for fixing and fixing the tool holder
16. Handles of manual cross feed of a support
17. Handle for feeding the upper (incisal) slide of the caliper
18. Handle for attaching the tailstock quill
19. Nut for fastening the carriage to the frame
20. Tailstock mounting nut
21. Handwheel for moving the tailstock quill
22. Leadscrew Nut Lever
23. The handle of inclusion of longitudinal or cross giving
24. Handle for turning on, stopping and reversing and blocking the main drive
25. Line switch

Kinematic diagram of a screw-cutting lathe LT-10, LT-11

Chain of the main movement

The rotation of the product fixed in the chuck or in the centers is carried out by an electric motor through a gearbox located in the left pedestal, then through a V-belt drive to the drive pulley of the headstock and then through the gears of the reborer or, bypassing the enumeration, directly to the spindle.

The change in the speed of rotation of the spindle is achieved by enumeration by moving the blocks of gears of the gearbox and switching the enumeration of the headstock.

Twelve different spindle speeds (from 28 to 1000 rpm) are carried out according to the following kinematic chains: from the motor shaft through the friction clutch, the movement is transmitted to the first shaft of the gearbox. Next, the rotation is transmitted to the second shaft through the gears 56-55; 57-59; 58-61, (Fig. 10), and to the third shaft - through gears 59-60; 62-63.

By V-belt transmission, the rotation of the output shaft of the gearbox is transmitted to the drive pulley of the headstock. Further, with the gear 23 turned on and the gear clutch 22 turned off, the spindle rotates at speeds from 28 to 160 rpm. The upper row of spindle speeds is carried out by turning on the gear clutch 22 with the simultaneous turning off of the gear 23.

Eccentric K drives the oil pump.

Feed chain

The mechanical longitudinal and transverse movement of the caliper during turning is carried out using a running roller through the mechanisms of the feed box and apron. Longitudinal movement of the caliper when cutting threads - with the help of a lead screw 43 and a mother nut 35. .

Manual longitudinal movement of the caliper is carried out by handwheel H through gears 29, 31, 30 and rack 40.

The feed box receives movement through the gears 17, 19, 18, 16 (headstock mechanism) and the replaceable gears of the guitar. Further, through gears 14, 13, 11, 10; 15, 11, 10, 14, 13, 12, 9; 15, 11, 12, 9, allowing you to get gear ratios 2/1, 1/1, 1/2, 1/4, cone gears, gears 7, 8, 25, block, gear 26-27 and gear 28 rotation is reported to the chassis roller, and through the included clutch M - lead screw.

The feed box mechanism makes it possible to cut the following threads through the lead screw with a pitch of 4 threads by 1 ″:

• metric - in increments of 0.4 to 10 mm;
• inch - in increments of 3 to 48 threads per 1 ″;
• modular - with a module from 0.25P to 5P.

The caliper receives longitudinal feeds from 0.03 to 2.91 mm / rev of the spindle through the roller, gears 36, 37, 47, 48, 49, 50, 51. 34, 52, 31 of the apron mechanism and rack and pinion gear 30 with rack 40; transverse feeds from 0.03 to 2.60 mm / rev of the spindle - when gear 48 is engaged with gear 46, through gears 44, 45 and screw 39 with nut 38.

Changing the direction of movement of the caliper is achieved by switching gear 16 located in the headstock.

The transverse movement of the caliper by hand is carried out through the screw 39 and nut 38 with the handle G, and the movement of the upper carriage is done only by hand through the screw 32 and nut 33 using the handwheel I.

Reducer

The gear mechanism (Fig. 12) is enclosed in a cast-iron housing, the flange of which is attached to the pedestal with four screws.

The rotation of the gearbox mechanism is transmitted from an electric motor attached to the gearbox housing through a disc friction clutch. Gearbox mechanisms transmit six different speeds to the output pulley. Mobile units 1 and 5 are controlled by two handles 4 and 9 (see Fig. 4) or 13 and 11 (see Fig. 5). The handle 9 (11) has three positions "1", "2", "3", obtained by turning it to the right and left. Handle 4 (13) has two positions "4", "5", obtained by turning it to the right and left.

Headstock

The headstock is installed and fixed on the top left of the frame. The rotation of the spindle is transmitted from the pulley 12 (Fig. 13) directly when the gear clutch 17 is turned on or through enumeration. The enumeration ratio is 1:6.3.

The spindle bearings are mounted on rolling bearings. The front tapered neck of the spindle rotates in an adjustable double-row roller bearing, and the rear - in a tapered roller bearing. The axial load on the spindle is taken up by a thrust ball bearing mounted in the rear support.

The spindle is unloaded from the tension forces of the belts by installing the pulley 12 on the gear 15, which rotates in two ball bearings 9.

When changing the belts, they are removed from the drive pulley of the gearbox, then the spindle assembly is partially disassembled, cover 13 is removed and the pulley with the belt is lifted up. Pulley 12 is removed with supports, after which the belts are replaced.

In order to dismantle the spindle, it is required to unscrew the screws of the front flange 22 and turn off the nuts 5. To facilitate the dismantling of the spindle, the gear wheel 19 is seated on splines. The front support is dismantled together with the spindle. The rear support remains in the bore of the headstock housing.

When disassembling the spindle, it is necessary to prevent the gear 8 with the thrust ball bearing 7 from falling to the bottom of the housing.

The spindle is assembled in reverse order. In this case, it is necessary to ensure that parts 11 and 14 are put in their place and in the correct position and locked with screws 10 and 16.

The headstock has two control handles. The right handle is used to turn the override on and off, and the left handle to reverse the feed. When turning on the gears, all handles must be brought to a fixed position, in order to avoid breakage of the gear teeth.

The front threaded end of the spindle is made according to OST 428.

The faceplate of the cartridges and the faceplate are equipped with crackers that protect them from unscrewing when the spindle is reversed.

Gear box for screw-cutting lathe LT-10, LT-11

The feed box mechanism is placed in a closed cast-iron case, screwed to the left side of the frame.

The design of the feed box mechanism provides for obtaining various threads and feeds by adjusting the guitar of interchangeable gears and switching gears of the box. Set of interchangeable gears 40; 45; 60; 127 (Fig. 14) is the main one, it allows, without additional reconfiguration of the guitar, to cut metric threads in increments of 0.75 to 10 mm and perform turning with feeds equal to 0.08-1.24 mm / rev.

The gears are switched by moving them with handles 1 and 3 (Fig. 4) or 5 and 7 (Fig. 5). The lead screw or lead roller is turned on by handle 7 (Fig. 4) or 10 (Fig. 5).

The lead screw should only be used for threading to avoid premature wear.

When turning, the mechanical feed of the caliper is carried out exclusively through the running roller.

tailstock

The movement of the tailstock (Fig. 15) along the bed is done manually. In the required position, the tailstock is secured with a nut.

The body of the tailstock can be displaced in the transverse direction along the slide in both directions from the center line by up to 10 mm, which is sometimes necessary when setting up a machine for turning cones. The displacement is carried out using screws installed in the headstock housing.

Apron

The apron (Fig. 16) is a molded box, one of the walls of which is removable.

The apron contains mechanisms that transmit movement to the caliper carriage and the upper slide from the lead screw or lead roller.

The caliper is fed during turning by means of a running roller through a bevel gear transmission.

On the handwheel of the longitudinal feed, there is a dial for the longitudinal movement of the support with a division value of 1 mm.

The inclusion of the longitudinal and transverse feeds of the caliper is made by turning one handle.

On the right side of the apron there is a handle for turning on the split nut of the lead screw, which provides mechanical feed when threading.

The apron has a blocking device that prevents the feed from the lead screw and the lead roller from being turned on simultaneously.

Manual movement of the apron is carried out by rotating the handwheel located on the left side of the apron. It is provided to turn off the rotation of the handwheel when cutting threads.

On the right side of the apron is attached the handle for turning on the spindle drive motor. To protect against accidental activation, it has a locking device. After completion of work, the handle should be retracted to the right.

caliper

The caliper (Fig. 17), thanks to the cross design, can move in the longitudinal direction along the frame guides and in the transverse direction along the carriage guides. Both of these movements can be carried out both from a mechanical drive and by hand. In addition, the upper slide, carrying a four-position tool post with four fixed positions, has independent manual movement along the guides of the middle rotary part of the support, which can be rotated by ± 60 °.

When turning the end surfaces, the caliper carriage is fixed motionless on the frame by means of a bar and a screw.

Electrical circuit diagram of a lathe LT-10, LT-11

The LT-10 universal lathe is considered one of the most popular types of light equipment. Despite the fact that the production of machine tools has long been discontinued, even today the model can give odds to many modern devices in ease of operation, reliability and economy, and precision in metalworking.

Description and purpose

Modification of the unit with the addition of the letter "M" in the designation was produced for use in mobile workshops (the so-called "kungs"), with the letter "C" - for operation in the shops of enterprises as stationary equipment. According to passport data, LT-10 series machines can perform the following operations:

• turning in centers and chuck;
• processing of internal surfaces of blanks;
• drilling and centering holes in parts;
• cutting inch, metric (screw), modular thread;
• wide range of finishing finished products(polishing, grinding).

The advantages of using the machine include:

• affordable cost of used equipment;
• exceptional accuracy of workpiece processing;
• ease of replacement of cutters, workpieces;
• the speed of carrying out all the operations described in the passport of the machine;
• trouble-free operation of mechanical and electrical components;
• safety of any operations;
• ease of maintenance;
• low power consumption.

Characteristics

Basic parameters and specifications lathe LT-10 allow the processing of workpieces up to 960 mm long, while the accuracy corresponds to class H. The largest diameter of the blank during operation:

• above the notch of the bed - 540 mm;
• above the bed - 400 mm;
• above the upper part of the caliper - 250 mm.

Spindle taper according to Morse category 5. Maximum diameters:

• the rod to be installed inside the spindle - 36 mm;
• spindle bore diameter - 38 mm.

The equipment allows processing parts at a minimum speed of 34.5 rpm, maximum - 832 rpm. The spindle has 12 steps on forward and reverse turns. The characteristics of the LT-10 M machine are as follows:

• dimensions: 2160x975x1410 mm;
• weight together with remote equipment - 1000 kg;
• main drive motor power - 2.2 kW.
• cooling pump motor power - 0.125 kW.

Due to its compact size and relatively low weight, the machine can easily be placed in small production workshops with a lack of free space, a garage, summer cottages, and even in a private house. The equipment is often installed in service stations for the production of non-serial and rare spare parts for cars.

Device

Bed and headstock

The headstock of the LT-10 machine is placed on a cast iron bed. Bed - a node consisting of a table and a pair of guides used to position and secure the headstock. The speed and accuracy of metalworking blanks largely depend on the operation of the guides, the coincidence of their axes with the axes of the centers of the horizontal and vertical planes. In terms of its design and functions, the headstock, located in the left half of the frame, has much in common with the gearbox. In its center there is a shaft, on the outer surface of which there is a connecting thread for fixing the cartridge. The element provides for the presence of gears with different diameters. The gear is driven by a guide mechanism, through which the rotation speed is adjusted. Changing the speed is performed by handles located on the front side of the headstock.

Tip: Focus on the special table located next to the levers. It shows a drawing with symbol each position and the required number of spindle revolutions.

Spindle

The spindle is considered a key actuating element in the machine circuit, and other mechanisms are functional. The increased wear resistance of the actuating unit element is due to the use of high-alloy steel in the manufacture. The spindle has a conical hole, the purpose of which is to mount the working tool and fixtures:

• mandrels;
• reamers;
• drills;
• workpiece centering.

On the left side of the element there is a thread with a recess for fixing the faceplate or cartridge. The recess is arranged in order to prevent damage to the cartridge due to abrupt or sudden cessations of the movement of the shaft.

Tip: Each element of the spindle assembly must be kept in good condition, as this directly affects the quality and accuracy of the work performed.

tailstock

An element whose main functional purpose is to provide a rigid stop and hold the workpiece or workpiece in a horizontal plane. The tailstock is placed on rails and is equipped with a quill with a conical center moving together with a fixed blank. Axial force is applied by a ball bearing. The element is also equipped with a locking unit that blocks the movement of the quill in emergency cases. The functional assembly can also move the quill across the bed when machining parts with a shallow cone. It is possible to install a variety of tools in the quill - drills, countersinks, reamers, etc.

caliper

A caliper is a mechanism that has a sled, that is, a separate guide axis, with the help of which movement is performed at an angle of 90 ° relative to the longitudinal axis of the table. Externally, the caliper is similar to a mechanical carriage with a pair of massive plates, between which the incisors are clamped. Fixation of cutters is carried out by a handle with a clamping bolt. The installed tool holder can simultaneously clamp 1-4 cutters, which allows you to quickly change operating modes. Structurally, the carriage can move in two planes:

• along the guides of the bed;
• by skids.

Thanks to the equipment of the guides with special conical descents, it is possible to move the caliper in an inclined plane.

Gearbox

The movement of the caliper along and across the bed in the process of turning is carried out by means of a running roller through the mechanisms of the apron and feed chains. When cutting threads, the caliper moves longitudinally with the help of a mother nut and a lead screw.

Setting the frequency

The frequency converter in the machine can be installed instead of the gearbox for smoother or faster changes in spindle speed. For the correct operation of the machine, it is necessary to configure the frequency converter on the lathe. For normal switching on of the electric motor, the start can be assigned at a frequency of 10 Hz. The shaft rotation speed is increased by means of a resistor when the current frequency is increased to 400 Hz. Changing the direction of rotation of the shaft is carried out by switching the toggle switch of the converter.

Machine tools with markings LT-10 (M, C), 11 (M, C) were previously produced within the walls of the now-defunct machine-tool plant in the village. Ivanovka in Ukraine (Lugansk region). The LT-10 model successfully replaced the obsolete DT-10 machine.

Technical parameters of the machine LT-10

This screw-cutting lathe has been assigned normal accuracy according to GOST and has the following technical parameters:

• spindle speed is carried out in the range from 28 to 1000 rpm;
• limiting diameter of the workpiece above the bed - 0.4 m;
• the maximum diameter of the product above the caliper is 0.25 m;
• maximum length of the processed element - 0.96 m;
• electric motor power - 2200 W;
• length, width, height of the machine - 2.6 * 1.0 * 1.4 m;
• machine weight - 1 ton.

Machine device

The screw-cutting machine LT 10, like other turning units, includes the following components:

• bed;
• spindle;
• front and rear headstock;
• caliper;
• electrical node.

Cast iron bed with headstock

This machine assembly includes a cast iron table and two guides that are designed to install and fix the headstock. The speed and accuracy of processing metal parts depends on the quality of processing of the guides and their correspondence with the axes of the vertical and horizontal planes.

Machine device

The headstock, structurally and functionally similar to a gearbox with a shaft in the center, the outer section of which has a connecting thread for installing a cartridge, is located on the frame on the left.

Gears are provided in the headstock. All gears with different diameters are driven by a guide piece and are responsible for changing the rotation speed.

Turnovers are regulated by means of levers provided on the front surface of the headstock. On the plate, located near these levers, there is a diagram with positional pictures and the value of the number of revolutions of the spindle, equipped with a special chuck for fixing the workpiece.

Features of the spindle device

This is the main actuator in the entire LT 10 screw-cutting lathe. All other nodes are serving. The spindle is made of , which guarantees its exceptional wear resistance. It has a conical hole for mounting:

• mandrels;
• drill;
• reamers;
• front centering of the processed elements, etc.

On the spindle on the left there is a special threaded thread with a groove for mounting a cartridge or . The groove is designed to protect the chuck from the consequences of a sharp and sudden stop of the shaft. The quality of the high-precision processing of the element depends on the serviceability of all components of this assembly.

Appointment of the tailstock

A functional unit designed to create an emphasis and hold the blank in a horizontal position. The tailstock in the machine is located on the guides and is equipped with a built-in quill with a conical center moving along with the workpiece. Axial force is provided by a thrust ball bearing.

The tailstock was additionally equipped with a locking mechanism, which, if necessary, should block the movement of the quill. And also it has the possibility of shifting the quill transverse with respect to the frame for turning a part with a flat cone. Can be installed in the quill various tools, for example, reamers, drills, countersinks.

Support in lathe LT-10

This mechanism has its own guide plane or sled, providing movement at right angles to the longitudinal axis of the table. The caliper looks like a mechanical carriage, it contains two massive plates, incisors must be clamped between them.

Structurally, it is possible to move the carriage in two planes, namely along the sled and, directly, along the frame guides. And also provides the ability to move the caliper on an inclined plane. For this, the guides are equipped with special cone descents.

Electrical equipment of the screw-cutting unit

This assembly includes all the electrical components of the machine. The key component of the assembly that sets the drive of the device in motion is an asynchronous electric motor that operates on direct current. Thanks to the direct current, smooth speed control in the gearbox is guaranteed. The connection between the engine and the gearbox occurs with the help of pulleys on both devices and a drive belt.

Scope of use of the turning unit

Lightweight universal machines LT 10 (M, C), 11 (M, C) are designed to perform a variety of turning:

• in the cartridge;
• in the centers;
• cut threads of various types.

The considered lathe LT 10 with an additional letter "m" in the brand is designed to work in mobile repair shops, and with the letter "s" - in a stationary form in private production.

And the numbers in the marking of the models of these machines distinguish them by the value of the center-to-center distance (RMC). In other words, the RMC parameter for the LT-10 screw-cutting machine is 960 mm, and for the LT-11 it is 1400 mm.

According to the data from the operating manual of the installation, such types of turning operations are defined as:

• turning workpieces made of wood and metal;
• processing of inner diameters of blanks;
• drilling and centering holes in blanks;
• (metric, inch, modular);
• finishing turning operations for finished products of cylindrical type (polishing, grinding).

Due to their characteristics, these machines can be easily placed in living conditions with increased constraint, namely in the garage, in the country and even in the house. LT screw-cutting lathes are often used in service stations to produce spare parts for cars of expensive or rare models.

Universal screw-cutting lathes LT-10, LT-10M, LT-10S, LT-11, LT-11M, LT-11S were produced at the enterprise Ivanovo Machine Tool Plant in the village of Ivanovka, Lugansk region (formerly Voroshilovograd) in Ukraine.

The LT-10 machine replaced the outdated DT-10 screw-cutting lathe.

LT-10 Universal screw-cutting lathe. Purpose and scope.

The screw-cutting lathe LT-10 replaced the outdated model DT-10 in production and was replaced by a more advanced model IT-1M .

Universal screw-cutting lathes of lightweight type LT-10, LT-11 are designed to perform a wide variety of turning operations in centers or chucks and for threading: metric, inch and modular.

Lightweight screw-cutting lathes and LT-11M were designed for use in mobile repair shops, such as KUNG (Today, KUNG is called any insulated booth on a car or trailer).

The LT-10 lathe fits into the DIP-200 size and is capable of processing medium and small disc-type parts with a diameter of up to Ø 540 mm above the recess in the frame and shaft-type parts up to Ø 250 mm above the upper part of the support.

Modifications of the screw-cutting lathe LT-10

• LT-10m- mobile screw-cutting lathe for installation in a car body, RMTs = 960 mm
• LT-11m- mobile screw-cutting lathe for installation in a car body, RMTs = 1400 mm
• LT-10s- Lightweight stationary screw-cutting lathe, RMTs = 960 mm
• LT-11s- Lightweight stationary screw-cutting lathe, RMTs = 1400 mm

Main technical characteristics of the screw-cutting lathe LT-10 (LT-11)

Manufacturer - Ivanovo Machine Tool Plant, Ivanovka, Ukraine.

The main parameters of the machine are in accordance with GOST 18097-93. Screw-cutting and turning machines. Main dimensions. Accuracy standards.

• The largest diameter of the workpiece type Disc, machined over the bed - Ø 400 , mm
• The largest diameter of the workpiece type Shaft, machined over the support - Ø 250 mm
• The largest turning diameter above the notch - Ø 540 mm
• Distance between centers - 960 (1400) mm
• The greatest length of turning - 875 (1315) mm
• Motor power - 2.2 kW, 1430 rpm
• Machine weight full - 1 (1,2) T

Spindle of the screw-cutting lathe LT-10 (LT-11)

• Spindle end - threaded M68
• Tool cone - cone Morse number 5
• Spindle hole diameter - Ø 38 mm
• The largest diameter of the processed bar - Ø 36 mm
• Spindle RPM limits (12 steps) - 28..1000 rpm
• Standard chuck diameter - Ø 250 mm

Feeds and threads of the LT-10 (LT-11) screw-cutting lathe

• Limits of longitudinal feeds: (38 steps) - 0,03..2,91 mm/rev
• Cross feed limits: (38 steps) - 0,03..2,60 mm/rev
• Limits of metric thread steps - (24 steps) 0,4..10 mm
• Limits of inch thread steps - (33 steps) 3..48 threads per inch
• Limits of pitches of modular threads - (25 steps) 0,25..5 modules

Machine accuracy class H.

Surface roughness V6.

By special order, for a fee, the following are supplied: a device for milling small planes, a device for external and internal grinding, a conical ruler and a movable square.

Machine tools LT-10M and LT-11M are intended for use in mobile repair shops, and LT-10S and LT-11S - for use in stationary conditions in individual production.

The universal screw-cutting lathe LT-10 differs from the LT-11 machine by an increased center distance. LT-10 has RMC = 960 mm, LT-11 has RMC = 1400 mm.

Overall dimensions of the working space of the LT-10 screw-cutting lathe

Overall dimensions of the working space of the machine lt-10, lt-11

Spindle of the screw-cutting lathe LT-10, LT-11

General view of the LT-10 screw-cutting lathe

Photo of screw-cutting lathe lt-10

Photo of screw-cutting lathe lt-10

Photo of screw-cutting lathe lt-10

The location of the components of the lathe LT-10M, LT-11M, intended for use in mobile repair shops

The location of the components of the lathe lt-10m, lt-11m

List of components of the lathe LT-10M, LT-11M

• 14. Machine bed
• 22. Reducer
• 24. Headstock
• 25. Guitar shroud
• 33. Cone ruler
• 34. Box feed
• 35. Apron
• 36. Caliper
• 41. Steady rest
• 42. Steady rest
• 44. Movable square
• 45. Tailstock
• 52. Cooling
• 71. Milling fixture
• 83. Electrical equipment

List of controls for lathe LT-10M, LT-11M

1. Handle for setting the amount of feed and thread pitch
2. Spindle speed setting knob
3. Feed cone handle
4. Handle for turning on, stopping and reversing the main drive
5. Spindle speed setting knob
6. Tailstock mounting nut
7. Handle for turning on, stopping, reversing and blocking the main drive
8. Coolant pump switch
9. Line switch

The location of the controls of the lathe LT-10S, LT-11S, intended for use in stationary conditions

The location of the controls of the lathe lt-10s, lt-11s

List of components of the lathe LT-10S, LT-11S

• 14. Machine bed
• 15. Spindle speed switch
• 22. Reducer
• 23. Guitar shroud
• 24. Headstock
• 33. Cone ruler
• 34. Box feed
• 35. Apron
• 36. Caliper
• 41. Steady rest
• 42. Steady rest
• 44. Movable square
• 45. Tailstock
• 51. Cooling
• 71. Milling fixture
• 72. Sander
• 84. Electrical equipment
• 85. Electrical cabinet

List of controls for the lathe LT-10C, LT-11C

1. Local lighting switch
2. Coolant pump switch
3. Sander switch
4. Stop button
5. Handle for setting the amount of feed and thread pitch
6. Feed Direction Change Lever
7. Handle for setting the amount of feed and thread pitch
8. Spindle speed setting knob
9. Feed cone handle
10. Handle for turning on the lead screw or lead shaft
11. Spindle speed setting knob
12. Handle for turning on, stopping, reversing the main drive
13. Spindle speed setting knob
14. Handwheel for manual movement of the caliper
15. Handle for fixing and fixing the tool holder
16. Handles of manual cross feed of a support
17. Handle for feeding the upper (incisal) slide of the caliper
18. Handle for attaching the tailstock quill
19. Nut for fastening the carriage to the frame
20. Tailstock mounting nut
21. Handwheel for moving the tailstock quill
22. Leadscrew Nut Lever
23. The handle of inclusion of longitudinal or cross giving
24. Handle for turning on, stopping and reversing and blocking the main drive
25. Line switch

Kinematic diagram of a screw-cutting lathe LT-10, LT-11

Kinematic diagram of lathe lt-10m, lt-11m

Chain of the main movement

The rotation of the product fixed in the chuck or in the centers is carried out by an electric motor through a gearbox located in the left pedestal, then through a V-belt drive to the drive pulley of the headstock and then through the gears of the reborer or, bypassing the enumeration, directly to the spindle.

The change in the speed of rotation of the spindle is achieved by enumeration by moving the blocks of gears of the gearbox and switching the enumeration of the headstock.

Twelve different spindle speeds (from 28 to 1000 rpm) are carried out according to the following kinematic chains: from the motor shaft through the friction clutch, the movement is transmitted to the first shaft of the gearbox. Next, the rotation is transmitted to the second shaft through the gears 56-55; 57-59; 58-61, (Fig. 10), and to the third shaft - through gears 59-60; 62-63.

By V-belt transmission, the rotation of the output shaft of the gearbox is transmitted to the drive pulley of the headstock. Further, with the gear 23 turned on and the gear clutch 22 turned off, the spindle rotates at speeds from 28 to 160 rpm. The upper row of spindle speeds is carried out by turning on the gear clutch 22 with the simultaneous turning off of the gear 23.

Eccentric K drives the oil pump.

Feed chain

The mechanical longitudinal and transverse movement of the caliper during turning is carried out using a running roller through the mechanisms of the feed box and apron. Longitudinal movement of the caliper when cutting threads - with the help of a lead screw 43 and a mother nut 35. .

Manual longitudinal movement of the caliper is carried out by handwheel H through gears 29, 31, 30 and rack 40.

The feed box receives movement through the gears 17, 19, 18, 16 (headstock mechanism) and the replaceable gears of the guitar. Further, through gears 14, 13, 11, 10; 15, 11, 10, 14, 13, 12, 9; 15, 11, 12, 9, allowing you to get gear ratios 2/1, 1/1, 1/2, 1/4, cone gears, gears 7, 8, 25, block, gear 26-27 and gear 28 rotation is reported to the chassis roller, and through the included clutch M - lead screw.

The feed box mechanism makes it possible to cut the following threads through the lead screw with a pitch of 4 threads per 1 ":

• metric - in increments of 0.4 to 10 mm;
• inch - in increments of 3 to 48 threads per 1 ";
• modular - with a module from 0.25P to 5P.

The caliper receives longitudinal feeds from 0.03 to 2.91 mm / rev of the spindle through the roller, gears 36, 37, 47, 48, 49, 50, 51. 34, 52, 31 of the apron mechanism and rack and pinion gear 30 with rack 40; transverse feeds from 0.03 to 2.60 mm / rev of the spindle - when gear 48 is engaged with gear 46, through gears 44, 45 and screw 39 with nut 38.

Changing the direction of movement of the caliper is achieved by switching gear 16 located in the headstock.

The transverse movement of the caliper by hand is carried out through the screw 39 and nut 38 with the handle G, and the movement of the upper carriage is done only by hand through the screw 32 and nut 33 using the handwheel I.

Reducer

Reducer of the lathe lt-10m, lt-11m

The gear mechanism (Fig. 12) is enclosed in a cast-iron housing, the flange of which is attached to the pedestal with four screws.

The rotation of the gearbox mechanism is transmitted from an electric motor attached to the gearbox housing through a disc friction clutch. Gearbox mechanisms transmit six different speeds to the output pulley. Mobile units 1 and 5 are controlled by two handles 4 and 9 (see Fig. 4) or 13 and 11 (see Fig. 5). The handle 9 (11) has three positions "1", "2", "3", obtained by turning it to the right and left. Handle 4 (13) has two positions "4", "5", obtained by turning it to the right and left.

Headstock

Headstock of the lathe lt-10m, lt-11m

The headstock is installed and fixed on the top left of the frame. The rotation of the spindle is transmitted from the pulley 12 (Fig. 13) directly when the gear clutch 17 is turned on or through enumeration. The enumeration ratio is 1:6.3.

The spindle bearings are mounted on rolling bearings. The front tapered neck of the spindle rotates in an adjustable double-row roller bearing, and the rear - in a tapered roller bearing. The axial load on the spindle is taken up by a thrust ball bearing mounted in the rear support.

The spindle is unloaded from the tension forces of the belts by installing the pulley 12 on the gear 15, which rotates in two ball bearings 9.

When changing the belts, they are removed from the drive pulley of the gearbox, then the spindle assembly is partially disassembled, cover 13 is removed and the pulley with the belt is lifted up. Pulley 12 is removed with supports, after which the belts are replaced.

In order to dismantle the spindle, it is required to unscrew the screws of the front flange 22 and turn off the nuts 5. To facilitate the dismantling of the spindle, the gear wheel 19 is seated on splines. The front support is dismantled together with the spindle. The rear support remains in the bore of the headstock housing.

When disassembling the spindle, it is necessary to prevent the gear 8 with the thrust ball bearing 7 from falling to the bottom of the housing.

The spindle is assembled in reverse order. In this case, it is necessary to ensure that parts 11 and 14 are put in their place and in the correct position and locked with screws 10 and 16.

The headstock has two control handles. The right handle is used to turn the override on and off, and the left handle to reverse the feed. When turning on the gears, all handles must be brought to a fixed position, in order to avoid breakage of the gear teeth.

The front threaded end of the spindle is made according to OST 428.

The faceplate of the cartridges and the faceplate are equipped with crackers that protect them from unscrewing when the spindle is reversed.

Gear box for screw-cutting lathe LT-10, LT-11

Sketch of the feed box of the lathe lt-10m, lt-11m

Lathe feed box lt-10m, lt-11m

The feed box mechanism is placed in a closed cast-iron case, screwed to the left side of the frame.

The design of the feed box mechanism provides for obtaining various threads and feeds by adjusting the guitar of interchangeable gears and switching gears of the box. Set of interchangeable gears 40; 45; 60; 127 (Fig. 14) is the main one, it allows, without additional reconfiguration of the guitar, to cut metric threads in increments of 0.75 to 10 mm and perform turning with feeds equal to 0.08-1.24 mm / rev.

The gears are switched by moving them with handles 1 and 3 (Fig. 4) or 5 and 7 (Fig. 5). The lead screw or lead roller is turned on by handle 7 (Fig. 4) or 10 (Fig. 5).

The lead screw should only be used for threading to avoid premature wear.

When turning, the mechanical feed of the caliper is carried out exclusively through the running roller.

tailstock

The movement of the tailstock (Fig. 15) along the bed is done manually. In the required position, the tailstock is secured with a nut.

The body of the tailstock can be displaced in the transverse direction along the slide in both directions from the center line by up to 10 mm, which is sometimes necessary when setting up a machine for turning cones. The displacement is carried out using screws installed in the headstock housing.

Apron

The apron (Fig. 16) is a molded box, one of the walls of which is removable.

The apron contains mechanisms that transmit movement to the caliper carriage and the upper slide from the lead screw or lead roller.

The caliper is fed during turning by means of a running roller through a bevel gear transmission.

On the handwheel of the longitudinal feed, there is a dial for the longitudinal movement of the support with a division value of 1 mm.

The inclusion of the longitudinal and transverse feeds of the caliper is made by turning one handle.

On the right side of the apron there is a handle for turning on the split nut of the lead screw, which provides mechanical feed when threading.

The apron has a blocking device that prevents the feed from the lead screw and the lead roller from being turned on simultaneously.

Manual movement of the apron is carried out by rotating the handwheel located on the left side of the apron. It is provided to turn off the rotation of the handwheel when cutting threads.

On the right side of the apron is attached the handle for turning on the spindle drive motor. To protect against accidental activation, it has a locking device. After completion of work, the handle should be retracted to the right.

caliper

The caliper (Fig. 17), thanks to the cross design, can move in the longitudinal direction along the frame guides and in the transverse direction along the carriage guides. Both of these movements can be carried out both from a mechanical drive and by hand. In addition, the upper slide, carrying a four-position tool post with four fixed positions, has independent manual movement along the guides of the middle rotary part of the support, which can be rotated by ± 60 °.

When turning the end surfaces, the caliper carriage is fixed motionless on the frame by means of a bar and a screw.

Electrical circuit diagram of a lathe LT-10, LT-11

The electrical circuit of the lathe lt-10m, lt-11m

LT-10, LT-11, LT-10M, LT-10S, LT-11M, LT-11S, Universal screw-cutting lathe. Video.

Technical data and characteristics of the machine LT-10M, LT-11M