USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 2
CONE POINT PUNCH ANGLES.
GRINDING A CONE POINT PUNCH.
(c) Dip the punch in water frequently to preserve temper.
(d) Do not grind away more metal than is necessary to obtain a
sharp cone-shaped point.
(3) Reshaping Mushroomed Head.
If the head of a punch becomes
mushroomed after extended use, grind to the original shape on a grinder
wheel. Restore temper after grinding.