19
12. Turn the spindle feed handwheel
1/2 turn in either direction and make
a second scratch cut. No change the
drum diameter.
Figure 16-Second scratch cut
13. Turn the lathe OFF.
14. Examine the scratch cuts.
If the first and second cuts are opposite one another (180°apart), fix wrong,
remove the drum from the arbor, check the mounting adapters and arbor for
nicks, burrs, or chips, remount the drum , and repeat scratch cut process.
If the scratches are side by side, fix right, proceed to step 15.
15. Turn the spindle feed hand-wheel until the deepest worn groove of the
drum lines up with the point of the tool bit.
16. Advance the tool bit into the bottom of the groove by rotating the cross feed
hand-wheel counter clock wise.
Note:
These operations may be done with the lathe running.
In cross feed dial, one case means 0.002” (0.05mm).
17. Determine the depth-of-cut:
●
Roughing cuts should be no deeper than 0.020"(0.5mm).
●
Finish cuts should be no shallower than 0.004"(0.1mm).
18. With the lathe running, set the
depth-of-cut dial to the depth desired
and lock the cross feed by tightening
the lock knob.
Figure 17 – Lock cross feed
19. With the drum running by spindle motor, turn the adjusted cross move
handwheel to make cutter feeding 0.002" to 0.004".
20. Check spindle lock knob whether loosen, turn the disc/drum switch, select
the drum position, tighten the portrait move handwheel knob, auto-feed start,
