AMMCO 6950 Twin Cutter Tool - Manual (Page 3)

6950 Twin Cutter Tool • 3
8. Wrench tighten the stud nut to secure the
twin cutter, then set the lathe spindle lock to
keep the spindle in position.
9. Turn the lathe on.
10. Loosen both tool holder lock knobs on the
twin cutter and turn the depth-of-cut
adjusting knobs until the tool bits just contact
the face of the rotor.
11. Hold the outer end of each knob and turn the
inner micrometer sleeve dial to zero (inch or
metric).
Always use the safety
shield and other
protective eye covering
when machining a disc brake rotor.
12. Turn the crossfeed handwheel to move the
cutting tools into the rotor center.
13. Set the proper depth-of-cut for each tool with
the adjusting knobs and lock the tools.
14. Engage the crossfeed lever and begin the cut.
Depth-of-Cut General Guidelines
Roughing cuts should be no deeper than 0.010"
(0.25 mm) per side.
Finish cuts should be no shallower than 0.002"
(0.05 mm) per side.
Tool Bit Holder Adjustment
Preliminary Cleaning
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, the tool bit holders themselves,
and the tool bit assemblies are clean.
2. Replace the brass gibs if the original gibs are
“mushroomed” or worn.
3. Clean the threads of the lock knob holes by
running a tap through them.
Adjusting
1.
Loosen and back off the hex nut locking the
locating screw in position.
2. Loosen and back off the lock screw.
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 screw until
the locating screw is loose and the lock screw
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 smooth, free
movement.
8. Repeat the procedure for the other tool bit
holder.
CAUTION