CHESTER 920 Bedienungsanleitung
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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