USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 2
allows them to spring together. The adjustment in the open adjusting types
is made by means of three screws in the holder, one for expanding and two
for compressing the dies. Round split adjustable dies are available in a
variety of sizes to cut American Standard Coarse and Fine threads, special
form threads, and for the standard sizes used in Britain and other European
countries. For hand threading, these dies are held in diestocks (figure 130
on the following page). One type has three pointed screws that will hold
round dies of any construction, although specifically made for open
adjusting type dies.
FIGURE 129.
TYPES OF ADJUSTABLE DIES.
(b) Two Piece Collet Dies. A two piece collet dies is used with a
collet.
The collet consists of a cap and a guide.
The die halves are
placed in the cap slot and are held in place by the guide which screws into
the underside of the cap.
The die is adjusted by means of setscrews at
either end of the internal slot. This type of adjustable die is issued in
various sizes to cover the cutting
171
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