CONNECTING RODS, PISTONS, RINGS & SLEEVES
Figure 27. - Operation of Counterboring Tool
1. Locking screw
2. Adjusting nut
3. Depth of cut
4. Feeler gauge
NOTE: An alternate method for setting the depth of
cut is to place a feeler gauge of required thickness
between the adjusting nut and top housing. Make
sure there is no grease or dirt between the adjusting
nut and top of the housing.
Rotate adjusting nut until feeler gauge is just
held between adjusting nut and top of housing.
All backlash must be removed.
Tighten locking screw (1, Fig. 27) securely and
remove feeler gauge (4) if this ALTERNATE
method is used.
Hold down on the handle applying more
pressure on tool bit side and rotate clock-wise
until the unit turns freely and is bottomed out
between the adjusting nut (2) and top of the
NOTE: To avoid damage to the tool bit, never rotate
counterclockwise when the tool bit is in contact with
the counterbore ledge.
Measure the counterbore depth as
described earlier in steps (6, a-c) of this
Maintain Counterboring Tool as follows:
Maximum tool bit life, of these accurately
ground select carbide bits can be obtained by
proper fitting into the tool bit holder and expert
Regrind tool bits as shown in Fig. 27.
Figure 28. - Tool Bit Grinding Specifications
A. 0.24-0.51 mm (0.010-0.020 in.)
C. 0.20-0.25 mm (0.008-0.010 in.)R.
G. 4.7 mm (3/16 in.) minimum.
PRINTED IN UNITED STATES OF AMERICA