CHESTER 920 Manual de usuario

920 Lathe

Manual

Chester UK Ltd

Clwyd Close

Hawarden Industrial Park

Hawarden

Chester

CH5 3PZ

Tel: 01244 531631

Email: [email protected]

www.chestermachinetools.com

Safety rules for Machine Tools

Warning: Do not attempt to operate until you have read thoroughly and completely understand all instructions

contained within this manual. Failure to comply can result in accidents involving fire, electric shock, or serious

personal injury.

Maintain owner’s manual and review frequently for continued safe operation.

1. Know your machine tool. For your own safety, read the manual carefully. Learn it’s application and limitations,

as well as the specific potential hazards for this machine.

2. Guard against electrical shock by preventing body contact with grounded surfaces. For example; Pipes,

radiators, refrigerator enclosures.

3. Keep guards in place and in working order.

4. Remove adjusting keys and wrenches. Make a regular habit of checking that keys and wrenches are removed

from the machine tool before turning it on.

5. Keep work area clean. Cluttered benches and work areas can cause accidents.

6. Don’t use in any dangerous environments. Don’t use machine tool in damp or wet locations or expose them to

rain. Keep work area well illuminated.

7. Keep children away. Anyone should be kept a safe distance away from the work area.

8. Make workshop child proof. Install padlocks, and switches, or remove starter keys from the area.

9. Don’t force machine tool. Your machine will work better and safer.

10. Use the right tool(s). Don’t force tool(s) or attachment(s) to do a job which they aren’t designed for.

11. Wear proper apparel. Don’t wear any loose clothing, gloves, jewellery, or ties which could get caught in

moving parts. Non slip footwear is recommended. Wear protective hair coverings for long hair.

12. Always use safety glasses. Face or dust masks should also be used if cutting operation is dusty. Everyday

glasses only have impact-resistant lenses, these are not suitable for safety glasses.

13. Secure work. Use clamps or a vice to hold work when practical. This is safer than using your hands and frees

them to operate the machine.

14. Don’t overreach. Keep proper footing and balance at all times.

15. Maintain machine tool(s) in top condition. Keep tools sharp and clean for best and safest performance. Follow

instructions for lubricating

16. Disconnect tools from power source. Before servicing, and when changing accessories, when mounting, or re-

mounting motor.

17. Avoid accidental starting. Make sure switch is in the “off” position before plugging in.

18. Use recommended accessories. Consult the owner’s manual for recommended accessories. Use of improper

accessories may be hazardous.

19. Never stand on a tool. Serious injury could occur if the tool is tipped or if the cutting tool is unintentionally

contacted.

20. Check damaged parts. Before further use of the machine tool, guard, or any other part that is damaged should

be checked carefully to ensure that it will operate properly and perform it’s intended function. Check for

alignment of moving parts, binding of moving parts, breakage of parts, mounting and any other conditions that

may affect it’s operation. A guard or any other part that is damaged should be properly repaired or replaced.

21. Direction of feed. Feed work into a blade or cutter against the direction of rotation of the blade or cutter only.

22. Never leave tool running unattended. Turn the power off. Don’t leave the machine tool until it comes to a

complete stop.

WEARYOUR

Safety rules for lathes

Safety is a combination of operator common sense and alterness at all times when the lathe is being used. Study

these safety rules and general safety rules before operating and retain for future use.

1. Wear eye protection (ANSI approved)

2. Never attempt any operation or adjustment if procedure is not understood.

3. Keep fingers away from revolving parts and cutting tools whilst in operation.

4. Never force cutting action.

5. Never perform an abnormal or little used operation without study and use of adequate blocks, jigs, stops,

fixtures etc.

6. Use of shop manual such as “Machinery’s Handbook” or similar is recommended for cutting speeds, feeds,

and operation detail.

7. Do not remove drive cover whilst machine is in operation. Make sure it is always closed.

8. Always remove chuck key, even when the machine is not in operation.

9. Do not attempt to adjust or remove tools when in operation.

10. Always keep cutters sharp.

11. Never use in an explosive atmosphere or where a spark could ignite a fire.

12. Always use identical replacement parts when servicing.

Warning: Do allow familiarity (gained from frequent use of your lathe) to become commonplace. A careless fraction of

a second could allow for severe injury.

Index

Standard Equipment …………………………………………………………………………………………………. 5

Technical Data ………………………………………………………………………………………………………... 5

Setting up and preparing for operation of the machine ………………………………………………………….. 6

General description …………………………………………………………………………………………………... 7

Lathe bed ……………………………………………………………………………………………………………… 7

Headstock ……………………………………………………………………………………………………………… 7

Slides …………………………………………………………………………………………………………………... 8

Apron …………………………………………………………………………………………………………………... 8

Tailstock ……………………………………………………………………………………………………………..…. 9

Leadscrew …………………………………………………………………………………………………………… 9

Gear box ………………………………………………………………………………………………………………. 9

Drive and electrical equipment …………………………………………………………………………………….. 9

Controls ………………………………………………………………………………………………………………. 10

Working with the lathe ………………………………………………………………………………………………. 11

Setting the turning tool ………………………………………………………………………………………………..11

Manual turning …………………………………………………………………………………………………….….. 11

Longitudinal turning with auto-feed ………………………………………………………………………………… 11

Taper turning using tailstock set-over ……………………………………………………………………………… 12

Taper turning by setting the top slide ………………………………………………………………………….…… 12

Turning between centres ……………………………………………………………………………………………. 12

Screw cutting ………………………………………………………………………………………………………….. 13

Example of mounting the gear wheels …………………………………………………………………………….. 13

Slipping clutch ………………………………………………………………………………………………………… 13

Thread cutting table …………………………………………………………………………………………………. 14

Lathe accessories ……………………………………………………………………………………………………. 15

Universal lathe chuck, 3 or 4 jaw design …………………………………………………………………………… 15

4 Jaw Independent chuck ………………………………………………………………………………………….… 15

Drill chuck ……………………………………………………………………………………………………………… 15

Morse taper arbor …………………………………………………………………………………………………….. 15

Live centre ………………………………………………………………………………………………………………15

Centre steady rest …………………………………………………………………………………………………..… 16

Travelling steady rest …………………………………………………………………………………………………. 16

Setting the steady rest …………………………………………………………………………………………………16

Tool post ………………………………………………………………………………………………………………... 17

4-Way Tool post ……………………………………………………………………………………………………...… 17

Chip guard ……………………………………………………………………………………………………………... 18

Gear change lathe ……………………………………………………………………………………………………… 18

Cabinet stand …………………………………………………………………………………………………………… 18

Bearings and slide adjustment …………………………………………………………………………………………19

Adjustment of main spindle bearings ………………………………………………………………………………… 19

Adjustment of cross and top slides …………………………………………………………………………………… 19

Adjustment of feed screw end float …………………………………………………………………………………… 19

Feed screw backlash adjustment……………………………………………………………………………………… 19

Cross slide spindle ……………………………………………………………………………………………………… 19

Top slide spindle backlash adjustment ………………………………………………………………………….…… 20

Adjustment of half-nut guide …………………………………………………………………………………………… 20

Adjustment of leadscrew backlash ………………………………………………………………………………….… 20

Replacing the shear pin in the leadscrew ………………………………………………………………………….…. 20

Re-position the v-belt …………………………………………………………………………………………………... 21

Lubrication plan ………………………………………………………………………………………………………….. 22

Head stock ………………………………………………………………………………………………………………. 23

Drive ……………………………………………………………………………………………………………………… 25

Tensioning roller ………………………………………………………………………………………………………… 27

Quadrant ………………………………………………………………………………………………………………… 29

Lathe bed ……………………………………………………………………………………………………………..… 31

Gear box ………………………………………………………………………………………………………………… 33

Apron ……………………………………………………………………………………………………………………. 35

Saddle and cross slide ………………………………………………………………………………………………… 39

Drive …………………………………………………………………………………………………………………….. 41

Topslide …………………………………………………………………………………………………………………. 42

Tailstock …………………………………………………………………………………………………………………. 44

Travelling steady rest …………………………………………………………………………………………………. . 46

Wiring diagram ………………………………………………………………………………………………………….. 48

Standard Equipment

The following items are included with this machine:

• Bed

• Headstock

• Saddle, Cross, Top-Slides

• Tailstock

• Reduction Gear

• Automatic feed with quadrant and 6 change wheels

• Driving pin with nut

• Driver

• MT2 & MT3 Centres

• Single tool holder (clamp)

• Electrical equipment with motor etc..

• Service manual

Technical specifications

Centre Height

115mm (4-1/2”)

Distance between centres

500mm (20”)

Max. dia over slide

68mm (2-5/8”)

Required floor space

950 x 500mm (37-1/2” x 20”)

Weight

95kg (210lbs)

Headstock spindle nose

MT3

Hollow spindle (inside dia.)

20mm (3/4”)

Spindle bearings

2 adjustable precision taper roller bearings #32007

Spindle speeds

130, 300, 400, 600, 1000, 2000 rev/min (60Hz)

100, 250, 350, 500, 900, 1800 rev/min (50Hz)

Feed with Leadscrew

0.127mm/rev (0.005”/rev)

0.177mm/rev (0.006”/rev)

Thread pitches

Metric: 0.5-3mm

Imperial: 8-56 thread/inch

Tailstock

Spindle dia. 26mm (1”)

Spindle travel 40mm (1-5/8”)

MT2

Motor

Speed: 1720rpm (60Hz), 1500 (50Hz)

Capacity: 3/4hp

Setting up and preparing for operation

To avoid twisting of the bed, care should be taken to the location where the machine is bolted. Ensure that this is flat

and level.

Care must be taken to ensure that the stand is mounted and securely fastened to the floor, thus avoiding swing and

work inaccuracies. The machine must be fixed with 2 hex-headed screws (M10, length to suit the thickness of blade),

firmly onto the stand.

The protecting oil (or storage and transport) should be removed by washing with paraffin. After washing, clean with a

dry, soft cloth. Then oil the slide ways with caid-free oil.

Before using the machine, the instruction book should be read thoroughly by the operator to ensure familiarity with the

machine tool and it’s controls.

General Description

Lathe Bed

The Lathe bed is made of high-grade cast iron. By combining high

cheeks with strong cross ribs, a bed with low vibration and rigid

qualities is produced.

The two precision-ground vee slideways are re-enforced by precision

high-hardening and grinding. Giving an accurate guide for the

carriage and tailstock.

The main drive motor is mounted to the rear of the bed.

Head Stock

The headstock is cast from high-grade low-vibration cast iron. It is

bolted to the bed with 4 screws and 4 adjusting screws for alignment.

In the head, the large main spindle is mounted on 2 precision taper

roller bearings (#32007).

The hollo spindle is MT3 with a 20mm bore.

A quick change of the belt can be made by easing the tension on the

idler.

The type of belt used by the lathe has the great advantage of it’s

noiselessness at all speeds.

To protect the machine against accidental damage, a clutch is fitted

to the reduction pulley for the 120rpm speed.

Slides

The strong carriage is made from high-quality cast iron. The sliding

parts are smooth ground (Fig.1), it fits the vee on the bed without

play.

The lower sliding parts can be easily and simply adjusted. The cross-

slide is mounted to the carriage and moves on a dovetail slide which

can be adjusted for play using gibstrips.

The travel on the cross-slide is affected by the means of the

conveniently positioned cross spindle handwheel. There is a

graduated collar on the handwheel (1 graduation = 0.0254mm).

The top slide is mounted on the cross-slide and can be rotated 360°.

The top slide and the cross-slide travel in a dovetail slide and have

gibs, adjustable nuts, and a graduated collar (1 graduation =

0.0254mm).

A strong clamp is fitted to the top side.

For accurate facing operations, the carriage can be locked by

tightening the hex head screw (Fig.3).

Apron

The Apron is mounted on the long slide. In the apron, a tow-piece

half-nut is fitted. The half-nut guides can be adjusted from the outside.

The half-nut can be engaged by use of a conveniently placed lever.

The quick-travel of the long slide is by means of a rack which is

mounted on the bed, and a pinion, operated using a handwheel

mounted on the carriage within easy reach.

Tailstock

The tailstock slides on a vee and can be clamped in any position by

means of a heavy screw (Fig.1). The tailstock has a heavy-duty barrel

with a MT3 socket and a graduated scale.

The barrel can be clamped in any position by means of a clamping

lever. The barrel is moved axially by means of a handwheel mounted

on the rear end of the tailstock.

Leadscrew

The leadscrew is mounted on the front of the machine bed. It is

connected to the gear box at the left for automatic feed and is

supported by bearings on both ends.

The nut and set screw on the right end are there to take up play on

the lead screw.

Gear box

The gear box is made from high-quality cast iron, mounted on the

left side of the machine bed. The motor will drive through 9

changeable speeds.

Always raise the idler to the proper position when changing speeds

(Fig.3).

Drive and electrical equipment

The main drive is by a single phase AC motor. Mounted on the rear

of the lathe bed.

The auto-switch is mounted on the top of the box.

The motor condenser is also contained in this box (Fig.4).

Controls

1. Main switch for motor (Forward/Reverse)

2. Lever for adjusting tension

3. Long travel handwheel

4. Half-nut lever

5. Cross-slide handwheel

6. Top slide travel clamping screw

7. Long travel lamping screw

8. Tool clamp

9. Tailstock barrel handwheel

10. Tailstock barrel clamping lever

11. Tailstock locking screw

12. Tailstock cross adjustment

13. Fixing screw for drive cover

14. Automatic feed lever

15. Gear box quick change lever

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