Turning an rare set screw At our store we often encounter small tools.

Turning an rare set screw

At our store we often encounter small tools, toolholders, instruments, etc that have nonstandard and/or ancient four-tooth spline socket settle screws. Corresponding keys for as it is odd screws are not always available. In these situations, I use a suitable size four-flute reamer as a first note of the scale

I single out a reamer diameter size (DR) for the socket diameter (DS) that provides a diametrical clearance (CL) as small as practical (CL = D - DR) In general, les than 5% clearance (D - DR)/DR is ideal, further 10% and higher values may work. In each case, factors

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