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Summary of Contents for CHESTER 920
- Page 1 920 Lathe Manual Chester UK Ltd Clwyd Close Hawarden Industrial Park Hawarden Chester CH5 3PZ Tel: 01244 531631 Email: sales@chestermachinetools.com www.chestermachinetools.com...
- Page 2 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.
- Page 3 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.
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Page 4: Table Of Contents
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 ……………………………………………………………………………………………………………... -
Page 5: Standard Equipment
Standard Equipment The following items are included with this machine: • • Headstock • Saddle, Cross, Top-Slides • Tailstock • Reduction Gear • Automatic feed with quadrant and 6 change wheels • Driving pin with nut • Driver • MT2 & MT3 Centres •... -
Page 6: Setting Up And Preparing For Operation Of The Machine
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. -
Page 7: General Description
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. -
Page 8: Slides
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. -
Page 9: Tailstock
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. -
Page 10: Controls
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. -
Page 11: Working With The Lathe
Working with the lathe Setting the turning tool The cutting angle is only correct when the cutting edge is in line with the centre axis of the work piece. The correct height of the tool can be achieved by comparison with the point of centre mounted in the tailstock. -
Page 12: Taper Turning Using Tailstock Set-Over
Taper turning using Tailstock set-over Work to a side angle of 5° can be turned by setting over the tailstock (the angle depends on the length of the workpiece – Fig.1). To set over the tailstock, slacken the locking screw (1), unscrew the front adjusting screw (2), screw in the rear adjusting screw (3) until the required taper has been reached. -
Page 13: Screw Cutting
Screw cutting (with change gear) By changing the combination of gear wheels, it is possible to cut metric and imperial threads. Please refer to the table when changing and be sure that a mounting aid is in inserted between the meshing teeth (strip of paper). -
Page 14: Thread Cutting Table
Thread cutting table Imperial Metric... -
Page 15: Lathe Accessories
Lathe Accessories Universal Lathe Chuck, 3 or 4 jaw design Using these universal chucks, cylindrical or symmetrically profiled work pieces (round stock, triangular, square, hexagonal, octagonal, or twelve-cornered stock) can be clamped (Fig.1). Note: New lathe chucks have very tight fitting jaws, this is of vital necessity to ensure accurate clamping and a long service life. -
Page 16: Centre Steady Rest
Centre Steady Rest The center steady rest serves predominantly as a support for shafts on the free tailstock end. For many operations the tailstock cannot be used as it obstructs the turning tool or the drilling tool, and therefore must be removed from the machine. It is then the centre steady rest which functions as an end support, ensuring a chatter-free running of the machine is used. -
Page 17: Tool Post
Tool Post The tool post is mounted on the top slide. The tool (1) can be positioned where desired and then locked in place with a 3 point clamp with forked end (2) holding tool. Tighten the clamp nut (3) and level point clamp (4) with set screw (Fig.1). -
Page 18: Chip Guard
Cabinet Stand (optional) The optional stand is designed exclusively for the 920 lathe. Made of steel plate construction. The centre portion of the stand has a build in tool box (Fig.3). The centre portion has a build in storage cabinet. -
Page 19: Bearings And Slide Adjustment
Bearing and Slide Adjustment Adjustment of Main Spindle Bearings The main spindle bearings are correctly adjusted in the factory. If end play becomes evident after considerable use, the bearings can be adjusted by sacking the grub screw (1) in the slotted nut (2) on the back end of the spindle and tightening the slotted nut until all end play is taken up, but still allowing the spindle to revolve freely. -
Page 20: Top Slide Spindle Backlash Adjustment
Top Slide Spindle Backlash Adjustment Remove the 2 screws holding the spindle bracket in position and unscrew the spindle. Adjust the screw ring (1) until all backlash has been eliminated (Fig.1) Adjustment of Half-Nut Guide Loosen the two nuts (1) on the right hand side of the apron and adjust the control screws (2) until both half-nuts move freely without play, tighten both nuts again (Fig.2). -
Page 21: Re-Position The V-Belt
Re-positioning the V-Belt Loosen the screw on top of the headstock and open the cover. When re-positioning the belt it is necessary to slacken the idler. This is achieved by moving the lever in the direction of the headstock. Then the belt can be positioned on the required step. -
Page 22: Lubrication Plan
Lubrication Plan... -
Page 24: Headstock
Headstock... -
Page 26: Drive
Drive... -
Page 28: Tensioning Roller
Tensioning Roller... -
Page 30: Quadrant
Quadrant... -
Page 31: Lathe Bed
Lathe Bed... - Page 33 Index No. Parts No. Parts Name Remark 7001 7002 Rack Screw M4x8 7003 Head Screw 7004 Racket Oil Feeder Screw M6x20 7005 Set Screw M8x6 Stud M8x28 Set Screw M6x25 Spring Washer...
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Page 34: Gear Box
Gear Box... - Page 35 Gear Box...
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Page 36: Apron
Apron... - Page 37 Apron...
- Page 39 Apron...
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Page 40: Saddle And Cross Slide
Saddle and Cross Slide... -
Page 42: Drive
Drive... -
Page 43: Topslide
Top Slide... -
Page 45: Tailstock
Tailstock... -
Page 46: Travelling Steady Rest
Travelling Steady Rest... -
Page 48: Wiring Diagram
Wiring Diagram Caution: When 110v transfer to 220v only 3 wires were connected; Z1, U1, V2...
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