USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 2
tracks. It has a 3/8 inch diameter point, is 8 inches long, and has a T-
shaped head. The track pin punch is driven with a sledge hammer.
(2) Hollow Punches. Hollow punches are made to cut out gaskets, and
to cut holes in leather, canvas, paper, and metal.
They are made to cut
holes from 1/8 to 2 1/2 inches in diameter, and are suitable to cut through
work from 1/16 to 1/8 inch thick.
Gasket cutting punches are supplied in a set with one driving madrel and 7
punches, 1/4 to 5/8 inch diameter cut. Each punch is 1/16 inch larger in
diameter than the preceding size. Other gasket cutting punches are issued
individually.
c. Using Punches.
(1) Use a punch only for the purpose for which it is intended.
(a) Center punches are intended to start holes to be drilled with
a twist drill.
(b) Prick punches are intended for marking locations on soft metal
such as brass.
(c) Pin punches are intended to drive out straight or tapered
pins.
(d) Blacksmith's punches are used to punch holes in hot metal.
(2) Hold the punch lightly in the fingers of one hand, approximately
in the middle.
(3) Locate the end of
the punch at the point to be marked for a pin
to be driven, or a hole to
be cut, at an angle so that you can see the
point. Straighten the punch
after locating, so that it is perpendicular to
the work. Do not strike the
head of a punch with a hammer until the punch
is perpendicular.
(4) When punching holes in metal, use a center or prick punch to mark
the center. Scribe the desired circle with a pair of dividers. Select the
proper size and type punch; locate the punch on the scribed circle and
strike the head with a heavy hammer until the hole is cut.
Use a solid
punch and die in a punching machine for punching holes in
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