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Arc Euro Trade SC3 Dismantling And Reassembly Manual

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UNBEATABLE VALUE ENGINEERING PRODUCTS
SC3 Mini-Lathe
Dismantling and
Reassembly Guide
A picture story book to help you dismantle and
reassemble your Sieg SC3 Mini-Lathe
Arc Euro Trade Ltd.
10 Archdale Street, Syston, Leicester, LE7 1NA.
Web: www.arceurotrade.co.uk Phone: 0116 269 5693.
- 1 -

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Summary of Contents for Arc Euro Trade SC3

  • Page 1 SC3 Mini-Lathe Dismantling and Reassembly Guide A picture story book to help you dismantle and reassemble your Sieg SC3 Mini-Lathe Arc Euro Trade Ltd. 10 Archdale Street, Syston, Leicester, LE7 1NA. Web: www.arceurotrade.co.uk Phone: 0116 269 5693. - 1 -...

  • Page 2: Please Read This First

    2 speed spindle gearbox. Before dismantling your SC3 mini lathe, you should read through the The SC3 has a swing of 180mm (90mm centre height) and is 400mm entire guide and assess that you have the required equipment and between centres.
  • Page 3 8. Remove the transfer gear bracket. 9. Remove the tumbler reverse lever assembly. 10. Remove the belt cover. 12. Remove the tool post. 11. Remove the drive belt. 13. Remove the detent plunger & spring from the compound slide. 14. Remove the ball handle and spacer. 15. Tap the compound slide to remove the micrometer dial taking care not to lose the friction spring. 16.
  • Page 4 23. Remove the micrometer dial & friction spring. 24. Remove the dial bracket. 25. Remove the cross slide feed screw. 26. Remove left hand and right hand leadscrew carrier brackets. 27. Slide out leadscrew. 28. Undo the screws retaining the leadscrew cover..
  • Page 5 Dismantling the spindle Steps 34 to 77 include a bearing change from standard ball raced bearings to taper roller bearings. Switching to taper roller bearings will improve the machining accuracies and finish. Since in many cases, taper roller bearings are not an essential upgrade, and because you will need access to another lathe, a hydraulic press and bearing separator you may wish to keep the standard ball races and skip forward to step 77.
  • Page 6 42. Remove the leadscrew guard. 43. Remove the 2 hex socket and 2 hex head screws securing the head to the lathe bed. 46. Remove lock nuts, gear, belt pulley, 44. The head may now be lifted clear 45. Remove the front bearing 2 spacers and the key from the 47.
  • Page 7 55. Re-fit the head and lock down. 56. Re-fit the leadscrew cover. 57. Grease the front race and rollers and assemble. 58. Fit the front bearing cover. 59. Grease the rear race and rollers and fit. 60. Fit the rear bearing cover. 61.
  • Page 8 66. Fit the power board 67. Thread wires from bottom of motor board through motor cover and then through bed to front. 68. Fit motor cover. 69. Connect Mains In to top of board. 70. Fit power board cover. 72. Fit the power wires to the emergency stop switch (noting correct 71.
  • Page 9 76. Remove the tumbler reverse 77. Fit the drive belt and adjust the belt tension. 78. Belt tension adjustment screws. assembly and belt cover again. 79. When adjusting belt tension, it should 80. Run the spindle following the procedure below and check the belt is centred on the pulley. If not twist easily through 90°...
  • Page 10 85. If necessary, radius top rear edge of the rack and trial fit again. 83. Scrape any paint off the bed shears. 84. Trial fit the rack to check if it seats well or rocks. 86. Drill and tap the fixing holes deeper if necessary. 87.
  • Page 11 99. Oil and/or grease the gears and shafts, dovetail and half nut of the apron assembly. Check 1/2 nut dovetail is correctly adjusted by operating the lever. 100. Temporarily fit the apron to the saddle. 101. The leadscrew brackets as they come on 102.
  • Page 12 107. Slightly loosen apron fixing screws. 108. Lock 1/2 nut onto leadscrew and tighten 109. Unlock 1/2 nut and rack saddle up and down bed apron fixing screws. to check pinion has no tight spots on rack. 111. Check the bracket holes align with the holes 110.
  • Page 13 119. The mesh and neutral position can be improved by adjusting the position of the belt cover. 120. Oil the transfer gear shaft. 121. Grease the transfer gear shaft. 124. Temporarily fit the gear quadrant. 122. Fit the transfer gear assembly. 123.
  • Page 14 133. Fit end cover and front panel. 134. Remove right hand leadscrew bracket 135. Pinch up the guard screws. and fit screw guard. 136. Fit the leadscrew bracket with the 1/2 nut locked for position. 137. Wind the carriage up and down the bed to check guard clears and tighten the screws.
  • Page 15 148. Assemble onto saddle. 149. Fit adjusting screws and adjust so slide can be moved back and forth easily by hand. 150. Grease / oil the feed screw and bracket. 151. Assemble onto the saddle. 152. Fit the handle. 153. Slacken the bracket screws, wind the slide right back and tighten the screws. 155.
  • Page 16 163. Temporarily fit top slide to compound base 162. Fit compound base to cross slide. 164. Oil top slide assembly and fit. and check for clearance in corners of dovetail. 165. Fit gib strip and adjusting screws making sure they engage in the gib strip dimples. 166.
  • Page 17 172. Backlash can often be reduced by turning a recess in the spacer to clear the shoulder on the end of 173. Final adjust the top slide gib to your the feed screw. The recess depth should be slightly less than the measurement taken with the feeler preference and lock-off the screws.