1P611 High precision screw-cutting lathe. Passport, diagrams, characteristics, description

Information about the manufacturer of the screw-cutting lathe 1P611

1P611 screw-cutting lathe is Odessa SKB-3, 1961.

The manufacturers of the 1P611 are two machine-tool plants of the USSR, the Odessa Experimental Mechanical Plant and the Srednevolzhsky Machine-Tool Plant SVSZ , founded in 1876.

The production of metal-cutting machines at the Srednevolzhsky Machine Tool Plant first began at the end of January 1926. The first machine produced at the enterprise was a screw-cutting lathe with a stepped pulley, model TV-155V.

During the war years, the plant mastered the production of a screw-cutting lathe 1615

and soon upgraded it, bringing the spindle speed to 1000 rpm.

In 1949, the machine was put into mass production 1616

, in the sixties the models were
1B616 and 1A616
, and from the beginning of the seventies the production of the
16B16 .
Since the 90s of the last century, the SVSZ company has been producing lathes under the SAMAT .

Machine tools manufactured by the Srednevolzhsky Machine Tool Plant, SVSZ, Samara

1A616
universal screw-cutting lathe Ø 320
1A616k
screw-cutting lathe with automatic transmission Ø 320
1A616p
high-precision screw-cutting lathe Ø 320
1B811
turning and backing machine Ø 250
1E811
turning and backing machine Ø 250
1P611
universal screw-cutting lathe Ø 250
16B16
universal screw-cutting lathe 320
16B16P
universal screw-cutting lathe with increased precision Ø 320
16B16KP
universal high-precision screw-cutting lathe with automatic transmission Ø 320
16B16F3
chuck center lathe with CNC Ø 320
16B16T1
CNC lathe Ø 320
1615
universal screw-cutting lathe Ø 320
1616
universal screw-cutting lathe Ø 320
1716PF3
CNC lathe Ø 320
5350A
semi-automatic slot milling machine Ø 150
Samat 400
universal high-precision screw-cutting lathe Ø 320
Craftsman
table lathe Ø 175

Brief information about the manufacturer

The design team of the Odessa Machine Tool Plant has developed a new screw-cutting lathe. It differed from its analogues in its high processing accuracy. In 1968, model 1P611 was put into production.

The design documentation was transferred to the Saratov Machine Tool Plant. The machines were produced at the same time and actually differed only in the nameplate on the headstock. It indicated the name of the manufacturing plant.

After 1995, machine tool factories in Odessa were privatized and production decreased. Currently, only part of the workshops is operating. They make presses for making bricks and produce woodworking machines.

The Saratov plant continues to produce lathes and other high-precision metalworking equipment under the Samat brand. Simple manual models are a thing of the past. Now at the SVSZ - Srednevolzhsky plant, they produce CNC machines and automated lines.

1P611 High-precision universal screw-cutting lathe. Purpose and scope

The developer of the screw-cutting lathe 1P611 is Odessa SKB-3 . Start of mass production - 1961.

The universal screw-cutting lathe 1P611 of increased precision of the tool group is designed to perform a wide variety of work on centers, collet or jaw chucks for ferrous and non-ferrous metals, including turning cones, as well as for cutting metric, modular, and inch threads

1P611 lathe is used for finishing and semi-finishing work in single and small-scale production. The machines are intended for use primarily in multi-storey buildings, as well as in mobile repair shops and ships.

Machine 1P611 provides:

Various turning operations in centers, collet and jaw chucks;
A wide range of speeds and feeds ensures productive processing with good surface quality;
milling work, as well as processing with an end tool installed in a drill chuck;
External and internal grinding of parts in centers and chucks.

Lathe designation

1
— lathe (group number according to ENIMS classification)

– machine generation (A, B, C, D, K, L, P)

– subgroup number (1, 2, 3, 4, 5, 6, 7, 8, 9) according to the ENIMS classification (6 - screw-cutting lathe)

– height of centers above the bed (11, 16, 20, 25, 30, 40, 50) (11 – height of centers 135 mm)

Letters at the end of the model designation:

– a machine with a recess in the bed

– a machine with a copying device, with an automatic gearbox

– machine accuracy - (n, p, v, a, s) according to GOST 8-82 (P - increased accuracy)

– a machine with a digital display device (DRO) and preset of coordinates

– machine with CNC positional numerical control system

– machine with contour (continuous) CNC system

– multi-purpose machine with CNC contour system and tool store

Adjusting spindle bearings

To adjust the radial clearance of a double-row roller bearing of the front spindle support, you must:

adjust using nut 8
The recommended value of the radial clearance in the bearing is 0.005 mm
Eliminate the axial play of the spindle by grinding the spacer rings of the front support, followed by tightening nut 8, which after adjustment is secured with screws

Grind the spacer half rings to the size determined by the formula:

A = B - δ mm,

Where

B is the thickness of the removed half rings before grinding, mm;

δ is the amount of required displacement of the inner ring of the bearing δ relative to the spindle journal.

The displacement value δ is determined by the formula:

δ = 15(Δо - Δ 0.01) mm,,

Where

Δо - initial radial clearance (before adjustment), mm; Δ is the required radial clearance of the bearing, mm.

Screw-cutting lathe 1P611 is supplied with radial clearance Δ = 0.003 to 0.005 mm.

Technical characteristics of bearing No. 3182111

Bearing 3182111 is a double row radial roller bearing, with short cylindrical rollers, with a flangeless outer ring (as a result of which the set of rolling elements on the cage is able to move and create a “floating” support), with a tapered seat bore (1:12), groove and holes for adding lubricant.
The main place of operation of such bearings is machines for various applications, units where high radial loads and speeds are applied. This standard size, like most roller bearings in this series, is currently produced only with high precision. The bearing has always been produced at the Moscow GPZ-1 plant, but now, unfortunately, it has been discontinued and you can buy it directly only from companies that sell bearings from storage, surplus stock, used, and cleaned. You can find products of 2, 4, 5 and 6 accuracy classes. The designation to the right of the number is most often L (brass separator, old). The price of bearings greatly depends on their accuracy and safety class, from 300 to 2300 rubles.

Imported bearings of this size are designated NN3011K (the presence of the letter K in the number is mandatory, as it indicates a tapered fit). Products of different price categories are supplied to Russia: the most expensive and reliable are FAG, SKF, KOYO, IBC, the cheaper ones are NACHI and NSK. An even cheaper option is products from Eastern European manufacturers - ZKL and FLT, which are most often sold in illiquid quality, sometimes even used. The estimated price of the highest quality and most expensive bearings of this type is about 275 euros.

About other machines: Laser machine WATTSAN 6090 LT—Lifting table buy at prices from the manufacturer—LaserCut

Dimensions and characteristics of bearing 3182111 (nn3011k)

Inner diameter (d): – 55 mm;
Outer diameter (D): – 90 mm;
Width (H): – 26 mm;
Weight: – 0.623 kg;
Roller dimensions: - 8x8 mm;
Number of rollers: - 44 pcs;
Dynamic load capacity: - 70.5 kN;
Static load capacity: - 97.5 kN;
Maximum rated speed: - 11000 rpm.

Bearing diagram 3182111 (NN3011K) lathe 1P611

Photo of bearing 3182111 of a screw-cutting lathe 1P611

Technical characteristics of bearing No. 36210

Bearing 36210 is a single row angular contact ball bearing.
The type of load perceived is combined radial-axial. For rigid fixation of the shafts of machines that require high precision processing of parts, they are installed in pairs. In this case, bearings are selected with high degrees of accuracy (T or 2 and 4). The bearing is one-piece with a bevel on the outer ring. The contact angle of the 36000 series is 12°. In the Russian Federation it is produced in factories:

SPZ-4 (Samara) - modifications 6-36210 E and 6-36210 L (the first is a polyamide separator, the second is brass), assembled from components produced in China;
ZAP (Samara) - modifications T-36210 E, 4-36210 E, 5-36210 E, good quality bearings, production of “duplexes” is also possible;
3 GPZ (Saratov) - modifications 5-36210E5, 6-36210E, 4-36210 L, 6-36210L - similar in quality and configuration to ZAP, since both plants are part of the European Bearing Corporation.

There are sets of two bearings for rigid fixation of the shaft: double 336210 and double tandem 436210. The latter is the “driving force” of our bearing factories, since it is installed on the spindles of metalworking machines operating there and is consumed in very large volumes.

Foreign-made bearings of this type have the number 7210CD.

Dimensions and characteristics of bearing 36210 (7210):

Inner diameter (d): – 20 mm;
Outer diameter (D): – 90 mm;
Width (height) (H): – 20 mm;
Weight: – 0.47 kg;
Ball diameter: – 12.7 mm;
Number of balls in the bearing: – 14 pcs.;
Outer ring flange diameter: – 77.9 mm;
Inner ring flange diameter: – 61.8 mm;
Dynamic load capacity: – 43.2 kN;
Static load capacity: – 27 kN;
Rated speed: – 11000 rpm.

Diagram of bearing 36210 (7210) of a 1P611 lathe

Landing and connecting bases for lathe 1P611

Landing and connecting bases for lathe 1p611

Screw-cutting lathe bed 1p611

General view of the screw-cutting lathe 1P611

Photo of screw-cutting lathe 1p611

Apron for screw-cutting lathe 1p611

Location of components of screw-cutting lathe 1P611

Location of the main components of the lathe 1p611

Specification of components of screw-cutting lathe 1P611

Bed - 10
Cabinet - 15
Gearbox - 20*
Control mechanism - 22
Headstock - 25
Guitar - 30
Feed box - 35
Apron – 40
Caliper - 45
Tailstock - 50
Cone ruler – 52*
Cooling - 55
Fixed steady rest – 60*
Movable steady rest – 61*
Accessories - 62*
Fencing – 70*
Electrical equipment - 80
Switch - 82

Types of failures of lathes

In most cases, the structure of lathes is the same:

bed;
spindles;
working grandmother.

In this case, scraping of workpieces is usually carried out in a horizontal plane. If we analyze screw-cutting lathes, they differ from simple ones in that they have front and rear working headstocks, a support, a bed with an extension and a feed box. The following malfunctions occur in the equipment:

Based on practice, the spindle speed control module breaks first. Tapered roller bearings, which are used in many machines, are subject to the greatest degree of wear. From time to time, adjustment and replacement of bearings is necessary, which directly depends on the lubrication system and type of machine.
The next most common breakdown is a malfunction of the caliper locking holder. In this case, the part being processed moves unevenly, both in the transverse and longitudinal directions.

All lathes vary in size, design and type of workpieces. There are semi-automatic and automatic devices. The latter, as a rule, work much longer, since when feeding manually, the size of the head and the degree of its turning are often not calculated correctly.

Location of controls for screw-cutting lathe 1P611

Location of controls for lathe 1p611

Specification of controls for screw-cutting lathe 1P611

Input switch
Light switch
Cooling switch
Overload clutch handle
Handle for turning on mechanical longitudinal and transverse movement
Manual cross handle
Manual longitudinal movement handle
Handle for turning on and off handwheel rotation
Tool holder clamp handle
Handwheel for changing the spindle speed
Handle for changing the direction of spindle rotation and braking
Feed selector handle
Feed selector handle
Collet clamp handwheel
The handle of the snaffle and the inclusion of the uterine nut
Thread to feed switch handle
Leadscrew and shaft shift handle
Handle busting
Quill clamp handle
Handwheel for moving the quill
Upper carriage handle
Headstock clamp handle
Oil pump handle

Design of the main components of the screw-cutting lathe 1P611

The machine consists of the following components: bed, stand, gearbox, headstock, guitar, feed box, apron, caliper, rear headstock, cooling system, accessories, fence, electrical equipment and switch.

bed

The bed is installed and fixed on the machine stand, has prismatic guides for the support, a plane and a prism for the tailstock. Between the guides there are oval windows for pouring out chips. The side walls of the frame are connected by transverse U-shaped ribs. The left side of the bed is expanded at the location where the headstock is installed.

The headstock is installed on machined plane 1 (Fig. 8), coinciding with the plane of the front guide.

Installation of the machine spindle parallel to the bed guides is achieved by pressing the thrust protrusions of the headstock to the vertical machined plane of the guides 4.

The headstock is secured to the frame with four screws.

Plane 3 is used to mount the feed box, rack and rear bracket.

For the passage of belts, there is a ledge 2 on the front wall. On both sides of this ledge there are openings for the feed box housing. A lead screw 7 and a lead roller 6 are connected to the feed box, the right ends of which are mounted in the rear bracket 5 of the frame.

Cabinet

The machine stand is of welded construction.

The lower and upper parts of the cabinet are rigid frames 3 and 8 (Fig. 9) made of corners, to which thin sheets (sheathing) are welded.

A gearbox is mounted in the cabinet, on the tensioner plate 7. There are rubber gaskets 6 between the plate and the gearbox to reduce vibrations transmitted to the machine from the gearbox. At the back, the tensioner plate is closed with a cover 5 made of sheet material.

On the left side of the cabinet, through an oval window in the front wall, the gearbox speed control is located. An original switch with a handle for controlling the rotation of the electric motor is attached to the front left of the cabinet. In the front part of the cabinet there is a niche for the worker’s feet. On the right side of the cabinet there is an electrical equipment cabinet 4, and the switch handles are located on its front wall.

Between the electrical cabinet and the gearbox there is a cooling tank with an electric pump. A thin-sheet welded trough 1 is welded to the top of the cabinet, in which chips and coolant are collected when working with cooling. The coolant is drained through filter 2 troughs into the cooling tank. The filter is easily removed for cleaning.

Gearbox

Gearbox of screw-cutting lathe 1p611

The gearbox consists of an 8-speed gearbox, control mechanisms and lubrication.

Rotation is transmitted to the gearbox from an electric motor flanged to the gearbox housing. The gearbox mechanisms transmit eight different speeds to the output pulley 15 (Fig. 10) - the denominator of the geometric progression series is 1.41. The mobile gear units 5, 6, 9, 10, 11 are controlled using disk 2 with grooves at the ends. The grooves include lever rollers 1, 3, 4; the levers move the forks 16, 17 and 19, sitting on the rod 18. From the first roller 12 of the gearbox, the roller with the eccentric gear 14 rotates. The eccentric gear drives the plunger pump 13; from the latter, lubricant is supplied to the headstock, from where it drains through cover 7 into the oil bath of the gearbox 8, located on top, and lubricates the gearbox mechanisms. The gearbox together with a flanged electric motor is attached to the tensioner plate. By rotating the handwheel 21 along the dial 20, the required spindle rotation speed is set.

Headstock

Headstock of screw-cutting lathe 1p611

The front headstock is installed and secured to the top left of the frame. It contains spindle 5 (Fig. 11), gear 3, 4, feed drive and control mechanism. Rotation is transmitted to the spindle from pulley 2 directly when the gear coupling 9 is engaged or through overdrive. The gear ratio is 1:8. The machine spindle receives 14 different rotation speeds ranging from 33.5 to 3000 rpm with a row denominator of 1.41. The front spindle support is equipped with a double-row roller bearing 6, which takes up radial loads, and two angular contact ball bearings 7, which take up axial loads. Radial ball bearing 1 is installed in the rear spindle support.

The rear support of the spindle and drive pulley is located in bracket 11, molded to the headstock body, and is designed in such a way that it makes it possible to change belts without disassembling the spindle. The feed drive receives rotation from a gear located on the spindle and reduces the rotation speed of the first shaft of the guitar 10. The headstock feed drive ensures reversal of the guitar when cutting right-hand and left-hand threads.

The movable gears and clutches of the headstock are controlled by handle 12 located on the front wall of the headstock housing. The control of the gear coupling and gearing is interlocked by a disk with an end groove to avoid damage.

The product is clamped using a collet clamp.

The headstock mechanisms are lubricated by the gear pump using a tubular oil distributor. To control the flow of lubricant, an oil indicator is installed on the front wall of the headstock.

Spindle bearings for screw-cutting lathe 1P611

The spindle of the 1P611 machine is mounted on 4 bearings:

10. Front bearing No. 3182111 GOST 7634-56 double-row radial roller, accuracy class A(4), 55x90x26
11. Bearing No. 36210 GOST 831-62 angular contact ball, accuracy class A(4), 50x90x20
8. Rear bearing No. 207 GOST 8338-57 radial ball, accuracy class B(5), 35x72x17

Adjusting spindle bearings

To adjust the radial clearance of a double-row roller bearing of the front spindle support, you must:

adjust using nut 8
The recommended value of the radial clearance in the bearing is 0.005 mm
Eliminate the axial play of the spindle by grinding the spacer rings of the front support, followed by tightening nut 8, which after adjustment is secured with screws

Grind the spacer half rings to the size determined by the formula:

A = B - δ mm,

Where

B is the thickness of the removed half rings before grinding, mm;

δ is the amount of required displacement of the inner ring of the bearing δ relative to the spindle journal.

The displacement value δ is determined by the formula:

δ = 15(Δо - Δ + 0.01) mm,,

Where

Δо - initial radial clearance (before adjustment), mm; Δ is the required radial clearance of the bearing, mm.

Screw-cutting lathe 1P611 is supplied with radial clearance Δ = 0.003 to 0.005 mm.

Technical characteristics of bearing No. 3182111

Dimensions and characteristics of bearing 3182111 (NN3011K)

Inner diameter (d): – 55 mm;
Outer diameter (D): – 90 mm;
Width (H): – 26 mm;
Weight: – 0.623 kg;
Roller dimensions: - 8x8 mm;
Number of rollers: - 44 pcs;
Dynamic load capacity: - 70.5 kN;
Static load capacity: - 97.5 kN;
Maximum rated speed: - 11000 rpm.

Bearing diagram 3182111 (NN3011K) lathe 1P611

Photo of bearing 3182111 of a screw-cutting lathe 1P611

Technical characteristics of bearing No. 36210

SPZ-4 (Samara) - modifications 6-36210 E and 6-36210 L (the first is a polyamide separator, the second is brass), assembled from components produced in China;
ZAP (Samara) - modifications T-36210 E, 4-36210 E, 5-36210 E, good quality bearings, production of “duplexes” is also possible;
3 GPZ (Saratov) - modifications 5-36210E5, 6-36210E, 4-36210 L, 6-36210L - similar in quality and configuration to ZAP, since both plants are part of the European Bearing Corporation.

Foreign-made bearings of this type have the number 7210CD.

Dimensions and characteristics of bearing 36210 (7210):

Inner diameter (d): – 20 mm;
Outer diameter (D): – 90 mm;
Width (height) (H): – 20 mm;
Weight: – 0.47 kg;
Ball diameter: – 12.7 mm;
Number of balls in the bearing: – 14 pcs.;
Outer ring flange diameter: – 77.9 mm;
Inner ring flange diameter: – 61.8 mm;
Dynamic load capacity: – 43.2 kN;
Static load capacity: – 27 kN;
Rated speed: – 11000 rpm.

Diagram of bearing 36210 (7210) of a 1P611 lathe

Guitar

The guitar consists of a body 3 (Fig. 12), which is attached to the headstock, a ramp 4 and a cover 1. The ramp rotates on the flange of the headstock output roller and is secured in the desired position with a bolt 5. The axes of the replaceable gears are fixed in the groove of the ramp. It is possible to install various sets of replaceable gears that provide the feed drive settings listed in table. 2. In addition, other settings are possible.

Guitar replacement gears are designed for cutting various threads. Consists of a housing attached to the headstock and tilt box and cover. The tilt rotates on the flange of the headstock output shaft and is fixed in the desired position with a bolt. Customization of the feed drive is ensured by installing various sets of replaceable gears.

Gearbox

Feed box for screw-cutting lathe 1p611

The feed box ensures that the range of cut threads and feeds specified in the technical specifications is obtained.

The feed box body contains a pitch change mechanism 1 (Fig. 13), a multiplying mechanism 3 and control mechanisms 2. The rotation of the first roller of the feed box is transmitted by the guitar. Each of these mechanisms is controlled by disks 7 and 8 with an end groove. To cut precise threads, bypassing the feedbox mechanisms, a direct connection of the lead screw to the guitar is provided. The control handles for the pitch change mechanism 4, the multiplying mechanism 5 and the activation of the lead screw and the lead roller 6 are located on the front side of the box. Feedbox lubrication is wick. Lubricant is poured through the top cover.

Caliper

Support for screw-cutting lathe 1p611

The longitudinal slide of the support 2 (Fig. 14) moves along two prismatic guides of the frame. An apron is attached to the bottom of the longitudinal slide. From above, along the guides of the longitudinal slide, the transverse slide 7 is moved using screw 1. On top of the transverse slide there is a rotary slide 5 with an upper carriage 4 and a four-position tool holder 8, which has four fixed positions.

Ball grease nipples are installed to lubricate the caliper bearings.

Apron

Apron for screw-cutting lathe 1p611

The apron imparts longitudinal movement to the caliper and transmits rotation to the transverse feed screw. When cutting a thread, the movement is transmitted using a nut; when grooving, it is transmitted by a rack and pinion gear.

Rotation of the rack and pinion gear 8 (Fig. 15) from the roller is transmitted by an overload mechanism, a snaffle and intermediate gears.

The reloading mechanism consists of a cradle 18 sitting on the bushings 1 of the running roller, a gear pair 2-3, a worm gear, a lock 16 and a shift handle 4. As the longitudinal feed force increases, the force pushing the worm out of engagement with the worm wheel 19 increases. turn the cradle. To rotate the cradle, it is necessary to overcome the force of the clamp spring 15, the adjustment of which determines the largest value of the longitudinal feed. When overloaded, the cradle rotates, compressing the latch spring; the latch 16 falls into the upper groove of the tile 17, fixed to the cradle, and removes the worm from engagement with the worm wheel 19, the longitudinal movement stops. To turn on the overload mechanism, you need to pull up handle 4, located on the right on the side wall of the apron.

On the same axis with the worm wheel there is a swing arm 7 of the bit of the idler gear 13.

The snaffle transmits rotation from the worm wheel to the rack and pinion or cross feed screw. When switching the bit, the feed is reversed. The snaffle is switched by an eccentric 21 located on the axis of the control handle 20 of the uterine nut 22, which eliminates the possibility of simultaneous activation of the movements of the lead screw and the lead roller.

When the apron control handle is in the retracted position, it turns on the uterine nut 22, and when it is pulled out (towards itself), it turns on the feed.

Longitudinal and transverse feeds are switched by button 12 located on the front wall of the apron. The rack and pinion shaft 11-10 rotates the longitudinal feed dial 9.

The handwheel for manual movement of the apron 23 is switchable. To lubricate the apron mechanisms, a plunger pump 5 with a manual drive 6 is installed.

Tailstock

The rear headstock is installed on the flat and prismatic guides of the frame and secured in the desired position with an eccentric clamp 8 (Fig. 16). The transverse installation movement of the tailstock along the bottom plate 1 for turning cones is carried out by two screws 9. In the boring of the body 2, when the handwheel 5 rotates, the quill 3 moves. The quill is clamped by turning the handle 4, which tightens the crackers 6 and 7.

The quill clamp is located at the rear. Ball grease nipples are installed to lubricate the headstock.

Cooling

The unit consists of a coolant tank 4 (Fig. 17) with an electric pump 2 and a coolant supply connection 5: to the cutting tool with a valve 1 mounted on the fence post. The tank with the electric pump is installed in the machine cabinet. The coolant is drained from the trough into the tank through a mesh filter, and from the tank through drain 3.

Electric pump capacity 22 l/min.

Headstock

Headstock of screw-cutting lathe 1p611

Headstock of screw-cutting lathe 1p611. View enlarged

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The product is clamped using a collet clamp.

The headstock mechanisms are lubricated by the gear pump using a tubular oil distributor. To control the flow of lubricant, an oil indicator is installed on the front wall of the headstock.

Setting up and adjusting the screw-cutting lathe 1p611

Feed and thread settings

Various feeds along the lead roller (when turning) or the lead screw (when cutting threads) are adjusted by installing the corresponding replacement guitar gears and changing the position of the feed box handles.

The tables mounted on the body of the headstock and the guitar cover show the threads and feeds possible on the machine.

Tables for cutting threads and longitudinal feeds are also included in the machine passport.

Installing the tailstock

The tailstock is set to the zero position with two screws 9 (see Fig. 16). In this case, the headstock body moves along the guide tooth of the base.

Machine maintenance

1. Before starting the machine, you should study its diagram and design, the purpose of the handles and the order of their switching.

2. Check the correct installation of the handles and bring them to the locked position.

3. Do not change gears while moving.

4. When turning, use a roller; when cutting threads - with a lead screw.

5. Before processing products in centers, check the center holes (must be deep enough and clean); is the tailstock secured against longitudinal displacement, and after installing the product, clamp the quill, having previously lubricated the center; periodically lubricate the centers during operation.

6. Do not work on worn or clogged centers.

7. Stop the machine immediately if the center of the tailstock begins to get hot or “squeak.”

8. When turning long-length products, monitor the center of the tailstock and check its tension when lubricating.

9. Remove the center from the headstock spindle using a rod with a copper or brass tip.

10. When working with steady rests, lubricate their guide jaws.

11. When installing the chuck, clean it from chips and dirt.

Machine adjustment

The machine mechanisms should be adjusted during operation only if truly necessary. Machine elements to be adjusted:

1. Main movement drive belts - tension is produced by moving frame 7 with screw 9 (Fig. 9).

2. Caliper wedges 3 and 6 (Fig. 14) - adjust with screws.

3. Backlash of nut 10 of the upper carriage - select by compressing the nut with screws. The axial clearance in the supports of screws 1 and 9 of the caliper is adjusted with nuts.

5. Spring 15 (Fig. 15) of the apron adjusting device - adjust with screw 14 until a longitudinal feed force of 200 kgf is obtained.

Lathe repair cost

Type of work	Price
Spindle Prevention	9,000 rub.
Troubleshooting clamping devices	19,000 rub.
Burnout (damage) of the stator winding	30,000 rub.
Replacing bearings with rotor balancing	50,000 rub.
Replacing spindle sensors	10,000 rub.
Maintenance	10,000 rub.
Non-standard work	10,000 rub.
Major renovation	50,000 rub.
Modernization of machine tools	30,000 rub.

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Electrical circuit diagram of screw-cutting lathe 1P611

Electrical circuit of lathe 1p611

The electrical equipment of the machine contains:

1M - machine drive electric motor
2M - electric cooling pump
Control switch
ST - braking resistance
Local lighting
Starting and protective equipment

Operation of the electrical circuit of the screw-cutting lathe 1P611

By turning the input switch BB, voltage is supplied to the power circuits and control purposes
Switch II sets the required activation:

by turning the handle to the left, the spindle begins to rotate sideways, and the handle from a non-fixed position returns to its original similar position;
spindle rotation to the right is activated in the same way
turning the handle towards you slows down the spindle (the handle returns to its original position)

By turning the HV switch, only the electric cooling pump 2M is turned off

Electrical equipment protection

Protection against short circuit currents is provided by fuses
Overload protection of electric motors is carried out by thermal relays
Zero protection is provided by magnetic starters
The machine must be reliably grounded to the workshop circuit in accordance with existing rules and regulations
Operation of electrical equipment on the wall must be carried out in accordance with the document “Rules for the construction of electrical installations”

Technical characteristics of screw-cutting lathe 1P611

Parameter name	1P611
Basic machine parameters
Accuracy class according to GOST 8-82	P
The largest diameter of the workpiece above the bed, mm	250
The largest diameter of the workpiece above the support, mm	145
Maximum workpiece length (RMC), mm	500
Maximum length of workpiece turning, mm	450
Height of centers above the bed, mm	135
Spidel
Diameter of through hole in spindle, mm	26,5
The largest diameter of the processed rod in the chuck, mm	25
The largest diameter of the processed rod in the collet, mm	16
Number of speed steps for direct spindle rotation	14
Spindle direct rotation frequency, rpm	33,5..3000
Size of the internal cone in the spindle, M	Morse 4
Threaded spindle end	M45
Caliper
Maximum movement of the caliper longitudinal/transverse, mm	580/ 150
Number of longitudinal feed stages	24
Limits of longitudinal working feeds, mm/rev	0,05..0,7
Limits of working cross feeds, mm/rev	0,025..0,35
Speed of fast movements of the caliper, longitudinal, m/min	No
Speed of fast movements of the caliper, transverse, m/min	No
Number of metric threads to be cut
Limits of pitches of cut metric threads, mm	0,25..3,5
Number of inch threads to be cut
Limits of pitches of cut inch threads	80..7
Number of modular threads to be cut
Limits of pitches of cut modular threads	0,25..1,75
Number of cut pitch threads	No
Limits of pitches of cut pitch threads	No
Movement by one division of the dial in the longitudinal/transverse direction, mm	1/ 0,02
Diameter and pitch of the lead screw, mm	30 x 6
Running shaft diameter, mm	20
Upper slide
Maximum movement of the slide, mm	150
Movement of the slide by one division of the dial, mm	0,02
Movement of the slide per one revolution of the dial, mm	2,0
Angle of rotation of the sled, degrees	±45
The largest cross-section of the cutter holder, mm	16 x 16
Distance from the cutting surface to the center line, mm	16
Tailstock
Maximum movement of the tailstock quill, mm	70
Tailstock quill cone, mm	Morse 3
Tailstock quill diameter, mm	40
Maximum lateral displacement of the tailstock, mm	±10
Movement of the quill by one division of the ruler, mm	1
Electrical equipment
Number of electric motors on the machine	2
Main drive electric motor, kW	1,5
Cooling pump electric motor, kW	0,12
Dimensions and weight of the machine
Machine dimensions (length width height), mm	1510 x 700 x 1360
Machine weight, kg	560

Bibliography:

Universal high-precision screw-cutting lathe 1P611. Operating manual, 1961
Acherkan N.S. Metal-cutting machines, Volume 1, 1965
Batov V.P. Lathes., 1978
Beletsky D.G. Handbook of a universal turner, 1987
Denezhny P.M., Stiskin G.M., Thor I.E. Turning, 1972. (1k62)
Denezhny P.M., Stiskin G.M., Thor I.E. Turning, 1979. (16k20)
Modzelevsky A. A., Muschinkin A. A., Kedrov S. S., Sobol A. M., Zavgorodniy Yu. P., Lathes, 1973
Skhirtladze A.G., Novikov V.Yu. Technological equipment for machine-building industries, 1980
Tepinkichiev V.K. Metal cutting machines, 1973
Chernov N.N. Metal cutting machines, 1988
Pikus M.Yu. A mechanic's guide to machine repair, 1987