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Figure 1-55.Types of adjustable dies.
POWER TOOLS - 14310_47

Aviation Boatswains Mate E - Aviation theories and other practices
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guide, which screws into the underside of the cap. The die is adjusted by setscrews at both ends of the interval slot. This type of adjustable die is issued in various sizes to cover the cutting ranges 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.  1-55)  are available to cut American Standard Pipe threads. They are   held   in   ordinary   or   ratchet-type   diestocks   (fig. 1-57). 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 bolts. Figure 1-58 illustrates typical threading sets for pipe, bolts, and screws. Never attempt to sharpen taps or dies. Sharpening of taps and dies involves several highly precise cutting processes  that  involve  the  thread  characteristics  and chamfer. These sharpening procedures must be done by experienced personnel to maintain the accuracy and the cutting effectiveness of taps and dies. 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. For long periods of storage, coat taps and dies    with    a    rust-preventive    compound,    place    in individual or standard threading set boxes, and store in a dry place. REVIEW QUESTIONS Q25. Identify the different types of taps. Q26. What are taper taps used for? Q27. Identify the different types of dies. Q28. What   are   two-piece   rectangular   pipe   dies used for? 1-36 Figure 1-57.—Adjustable die guide and ratchet diestocks. Figure 1-58.—Tap and die thread sets.







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