AMMCO 4000E Drum and Disc Brake lathe - Manual (Page 17)

AMMCO Drum & Disc Brake Lathes • 15
17. Advance the tool bit into the bottom of the
groove by rotating the cross feed handwheel counter-
clockwise.
Note: These operations may be done with the lathe
running.
The depth of cut dial will show the approximate recon-
ditioned diameter of the drum. This measurement must
be compared with:
A. The maximum rebore limits cast into the drum.
B. The measured diameter to determine the best
amount of material to be removed in one pass.
18. Determine the depth-of-cut by these general
guidelines:
• Roughing cuts should be no deeper than 0.020”
(0.50mm).
• Finish cuts should be no shallower than 0.004” (0.10
mm) deep.
19. With the lathe running, set the depth-of-cut dial
to the depth desired and lock the cross feed by tight-
ening the lock knob.
Figure 23 – Lock cross feed
20. At the control console, select to activate either
the drum rough cut or drum finish cut button. The drum
feed rate may be changed by pressing either + or - but-
ton on the control console.
21. Set the feed shut-off by sliding it on the shaft to
a point that approximately equals the depth of the drum
and tightening it in place. The feed will stop when it
reaches this point.
Figure 24 – Set spindle feed shut-off
22. Press the drum start button to begin.
Spindle
Lock Knob
Shut-off
Collar
Cross Feed
Lock Knob