TB 43-0213
d. Cutter blades are designed to cut most efficiently
between 2100 and 3000 rpm. High speed drill motors
will cause the blades to overheat and become
work-hardened and brittle.
e. Cutter blades should be dipped in oil after every
other vehicle is drilled. This will prolong their useful-
ness.
TA504773
Figure 3-21. Drill Stop.
3-23/(3-24 Blank)