TM 9-243DIES - ContinuedROUND SPLIT ADJUSTABLE DIEThe round split adjustable die (1), or button die, may beadjusted through the screws on the holder. Adjustmenton the open type is done by turning the three screws onthe holder. One expands the die while the other twocompress the die. Adjustment of the screw type (2) isdone by turning a fine-pitch screw that either forces thedie jaws apart or allows them to spring together. Theround split adjustable dies are used to cut AmericanStandard Coarse and Fine Threads. A die holder orhandle is needed for proper operation of round splitadjustable dies.THREAD CUTTER SETUSING A HAND TAPThe thread cutter set is made up of a combination oftaps, dies, diestocks, tap wrenches, guides, and screw-drivers and wrenches for making adjustments. Threadcutter sets are used for cutting internal and externalthreads.The following procedures may also be followed whenusing a taper tap or a bottoming hand tap.WARNINGWEAR EYE PROTECTION.1Clamp a steel plate (1) securely in a vise (2). Drilland ream a hole of desired size.2Select tap (3) and secure in tap wrench (4).3Apply cutting oil to the tap and the hole.38-4
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