USE/CARS OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 2
TABLE II.
PIPE THREADS DATA FOR STANDARD PIPE.
(2) Cleaning.
Keep taps and dies clean and well oiled when not in
use.
Store them so that they do not contact each other or other tools.
(3) Storage. For long periods of storage, coat taps and dies with a
rust preventive compound; place in individual or standard threading set
boxes in a dry place.
11.
Thread Chasers
a. Purpose.
Thread chasers are used to rethread damaged external or
internal threads.
b. Types of Thread Chasers.
Thread chasers (figure 145 on the
following page) are threading tools that have several teeth.
These tools
are available to chase threaded parts having standard threads. The internal
thread chaser has its cutting teeth located on a side face. The external
thread chaser has its cutting teeth on the end of the shaft. The handle end
of the tool shaft tapers to a point.
c. Use of Thread Chasers. Select the proper thread chaser for the job.
You must know the number of threads per inch on the work. Simply use a rule
to measure off a distance and count the threads in the measured distance.
If screw pitch gages are available, use them to determine the number of
threads per inch. Secure the work firmly in a vise or hold the work in one
hand. Hold the
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