Figure 2-12.Diestocks, diecollet, and tap wrenches.
although it is made specifically for open adjusting-
Two-piece collet dies (fig. 2-11) are used with a
collet cap (fig. 2- 12) and a collet guide. The die halves
are placed in the cap slot and are held in place by the
guide that screws into the underside of the cap. The
die is adjusted by setscrews at both ends of the internal
slot. This type of adjustable die is issued in various
sizes to cover the cutting range of American Standard
coarse and fine and special form threads. Diestocks to
hold the dies come in three different sizes.
Two-piece rectangular pipe dies (fig. 2-11)
are available to cut American Standard pipe threads.
They are held in ordinary or ratchet-type diestocks
(fig. 2-13). The jaws of the dies are adjusted by set-
screws. An adjustable guide serves to keep the pipe in
alinement with respect to the dies. The smooth jaws of
the guide are adjusted by a cam plate. A thumbscrew
locks the jaws firmly in the desired position.
Threading sets are available in many different
combinations of taps and dies, together with diestocks,
tap wrenches, guides, and necessary screwdrivers and
wrenches to loosen and tighten adjusting screws and
Figure 2-13.Adjustable die guide and ratchet diestocks.