USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 2
metal up to 1/4 inch thick.
Use a hollow punch for holes in thin sheet
metal and in soft material.
NOTE
To prevent damage to the edge of the punch after it
finishes the cut, place a block of wood under the work
before cutting out holes with a hollow punch.
(5) When using blacksmith's punches, be sure the hot metal is
securely held and cannot be knocked off the bench or anvil. Make certain
the handle is tight.
(6) Never use a punch that has a mushroomed head, or whose point or
cutting edge is dull.
(7) To use the automatic center punch, turn the cap down or clockwise
for work requiring a heavy mark; for work requiring a light mark, turn cap
up or counterclockwise. No hammer blow is needed. Place the punch in an
upright position on the spot to be marked. A downward pressure releases the
internal striking hammer and makes the impression without danger of possible
injury to fingers if the hammer slides off the head of the punch.
This
punch is primarily used by toolmakers where more accurate and delicate work
is required.
d. Care of Punches.
(1) After using a punch, wipe it clean and apply a thin film of oil
to prevent rusting.
Carefully place punches on a shelf, rack, or other
suitable place to avoid damaging the points.
(2) For long periods of storage, apply rust preventive compound to
all metal parts, protect points and cutting edges, and store carefully.
e. Grinding and Shaping.
(1) Drift, Drive Pin, and Blacksmith's Flat and Punches.
Grind a
drift, drive pin, or blacksmith's punch so that the end is perfectly flat
and at right angles to the center line of the punch (figure 111 on the
following page). Grind other flat end punches in a similar way.
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