AMMCO 7000 Disc Rotor Lathe - Manual (Page 11)

Cross Feed - The cross feed draws the twin tool bits across the
face of a brake rotor when the cross feed drive is engaged. The
cross also be operated manually using the cross feed hand-
wheel.
Feed Speed - Feed speed refers to the number of thousandths
of an inch the cutting tools move across the face of the rotor per
revolution of the spindle. The cross feed speed control adjusts
the feed rate from .002" (.05 mm) to .004" (.10 mm) to .006" (.15
mm) per spindle revolution.
V-Belt Tension - When properly adjusted, the V-Belt should have
1/4" - 1/2" of slack. To adjust the tension, loosen the tension
adjusting nut so the weight of the motor pulls the V-Belt snug
and rotate red knob to its furthest counterclockwise position.
Push the belt in 1/4" - 1/2" on one side and tighten the nut, Fig.
B 5.
Cross Feed Leg Tension -- Be sure the brass plug and spring
are under the allen screw. (if the cross feed has been pulled out
beyond the end of the guide bar, the plug and spring may have
been lost.) Replace the plug and spring, Fig. B 6, then snug the
allen screw all the way down then back it off 1/8" of a turn.
Tool-Bit Holder Adjustment (Preliminary Cleaning) - Refer to
parts identification manual for nomenclature.
Before adjusting the tool-bit holders on a used twin cutter, the
following steps should be performed.
1. Be sure the tool-bit holder bores in the twin cutter body are
clean along with the tool-bit holders and tool-bit assemblies.
2. Replace the brass plugs if the original plugs are “mush-
roomed” or worn.
3. Clean the threads of the lock knob holes by running a tap
through them.
(Adjusting Tool-Bit) - Refer to parts identification manual for
nomenclature.
1. Loosen and back off the hex nut locking the locating screw
in position.
2. Loosen and back off the lock knob.
3. Firmly tighten the locating screw to align the tool-bit holder
by its locating groove.
4. Simultaneously loosen the locating screw and tighten the
tool-bit holder lock knob until the locating screw is loose and the
lock knob is tight.
5. Screw the locating screw in until it is snug, then back it off
1/8 to 1/4 of a turn.
6. Hold the locating screw in this position and tighten the hex
nut to lock the screw in place.
7. Turn the outer knurl of the twin cutter control left and right
to check for a smooth, free movement. Repeat the procedure
for the other tool-bit holder.
Brake Lathes
AMMCO 7000 Brake Lathes • 5
Figure B5
Figure B6