USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 2
FIGURE 110.
HOLLOW PUNCHES AND PUNCHING MACHINES.
b. Types of Punches.
The most common punches are the solid punches
(figure 109 on the previous page) they have various shaped points. Hollow
punches (figure 110) have a circular cutting edge and are sized according to
their cutting diameter.
Blacksmiths use solid punches that have handles.
Special punches are made for snap fasteners.
(1) Solid Punches.
Solid punches are made to mark materials, to
drive out straight or tapered pins, to mark metal for starting holes to be
drilled, to align holes in different sections of metal, and to punch holes
by hand in metal that is 1/32 inch to 1/8 inch thick. Punching machines are
capable of punching holes in metal that is from 1/16 inch to 1/4 inch thick.
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