Service Bulletin: INST 225.1
Subject: Shear Angle Position — Non-Round Bottom Maker Cutting Punch
Shear Angle Position
The shear angle position on non-round bottom maker punch has been changed. The old position was at the 9 and 3 o’clock position. The new shear angle position on non-round punches is now at 10 and 4 o’clock. Existing punches with the old position should not be modified to the new position as this will result in excessive grinding of valuable punch length.
DO NOT MODIFY OLD PUNCHES!