Procedure for removing and replacing Headstock Spindle for replacing any part
requiring this operation
This is the preferred procedure using the spindle puller details of which are given
onDrawings M4 and M5 in Appendix "B".
An alternative method is given in the Text Book of Turning.
The front and rear bearing caps are removed and the take-up nut unscrewed using
the "C" spanner illustrated on Drawing M6.
To remove the spindle, place the puller in position as shown in Drawing M1 and
tighten the puller nut (2) to pull the spindle clear of the rear bearing cone and bull
gear. The puller nut is then removed and the spindle completely withdrawn.
To replace the spindle, insert it through the bull gear and cone pulley, lining up the
bull gear keyway. Position the puller as shown in Drawing M2 and tighten the puller
nut (2) to pull the spindle through the bull gear. The nut and spacer are then
removed and the spacing collar placed on the spindle and turned until the keyway
spring engages in the keyway.
The rear bearing is then pulled on as shown in Drawing M3.
Finally, the front and rear bearing caps are replaced and the takenut screwed on
and tightened to give the recommended preload of 0.2 Newton metres and the lock
screw tightened.
Procedure for removing and replacing the Back Gear Shaft for replacing any part
requiring this operation. Refer Drawing A1 - Appendix A
Slacken off the back gear tension screw (138) and remove the back gear lever
adjusting screw (141). (It is advisable to loosen the nut (142) just sufficiently to free
the screw and then take the two off as one unit to give a guide to the correct
positioning when re-assembling). Drive out spring pin (135) and remove the back
gear lever (136) together with the back gear shaft (133).
To re-assemble, insert the back gear lever and shaft, and replace the spring pin. The
adjusting screw and nut are then replaced and locked in position to give the correct
gear backlash and the tension screw re-set.
Procedure for fitting a belt over the countershaft. Drawing A36 - Appendix A
(Early model machines had a one piece yoke and the procedure in this case is
outlined in the Text Book of Turning)
Firstly remove the Drive Pulley (216), loosen the locking screw (226) and tap the
pivot shaft (225) out towards the tailstock until it clears the left-hand yoke section.
Remove the clamping screw (204) and swing the left-hand yoke section (209)
forward until it is above the countershaft (211). The belt may then be fitted over the
cone pulley (212)
Re-assemble by swinging the yoke section back into position, replacing the clamping
screw, tapping the pivot shaft back into position, locking it with the screw and
replacing the driving pulley.
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