USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 2
otherwise damaged. Remove the wheel by tapping out the pin in the center of
the wheel, or by backing out the attaching screw on some types. Secure the
wheel in a suitable jig and carefully grind the cutting edge on a grinder
abrasive wheel or grindstone. Preserve the temper by frequently dipping the
cutter wheel in water during grinding. Any wire edge can be removed on an
oilstone.
(2) Storage. Clean and wipe cutters and flaring tools with a thin film of
oil before putting away after use.
Carefully store tools to prevent the
cutting wheels from becoming damaged.
Close the single flaring tool die
block, install the yoke, and turn down the flaring cone until it just
lightly touches an opening in the block, before storing.
Return parts of
the double flaring tool to their case after use.
For long periods of
storage, coat all parts of cutters and flaring tools with a rust preventive
compound; wrap cutter wheels in cotton or a small piece of rag saturated
with light machine oil to prevent damage; store in a dry place.
10.
Taps and Dies
a. Purpose. Taps and dies are used to cut threads in metal, plastic,
or hard rubber.
The taps are used for cutting internal threads, and the
dies are used to cut external threads.
b. Types of Taps. There are several types of taps issued by the Army
Ordnance Supply System.
The most common types are the taper, plug,
bottoming, and pipe taps (figure 126 on the following page).
Special
purpose taps (figure 127 on the following page) such as mud or washout taps,
boiler taps, and staybolt taps are also discussed in this subparagraph.
(1) Taper Hand Tap.
The taper or starting hand tap has a chamfer
length of 8 to 10 threads. These taps are used when starting the tapping
operation, and when tapping coarse threads in through holes, especially in
harder metals.
(2) Plug
Hand Taps.
Plug hand taps are designed for use after the
taper tap, and
in through holes when tapping softer metals or fine-pitch
threads. They
have a chamfered length of 3 to 5 threads. These taps are
the most widely
used.
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