Most frequently propelled by hammers, driftpins, as the name implies, are used to drive shafts or locking pins through and out of holes. Ideally in deep holes, their diameter should be only slightly smaller than the bore to help guide them. Sizes range from about 1/16" up.
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DRIFTPINS.
1. Smallest 1/16"
1 & 2 are hex handled.
3 & 4 are round.
4 is modified with cup.
5 & 6 are square.
The pin's driving face edges should be BROKEN or slightly rounded to avoid bore gouging.
Special hollowed cup tips are required for tapered (needle point) axles to prevent tip damage. The bore edge should be rounded to eliminate jamming on the taper.
BREAKING EDGES
To avoid using a four jaw, lathe chuck, modify round or hex handle pins. Chuck the pin and center drill. Using successively larger bits, drill to clear shaft or axle ends. Flat end bores for driving blunt shafts are finished with a flat end mill. Finally break the outside and bore edges as circular arcs to avoid chiselling and jamming.
Closely related are center PUNCHES _for marking drilling centers and wedge shaped CHISELS _for removing material.
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