Jewel-hole Driller
Overall rating: (N/A)
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Operates battery of horizontal, multispindle, drilling
machines to drill center holes in round jewel bearing blanks:
Puts molten shellac on end of work spindle and centers jewel on
spindles, using small, hand cnetering tool.
Fits drill bits in
soft shellac in dirll head. Trues up (aligns) bit by holding bit
lighlty with tweezers to detect any play indicative of poor
alignment; straightens bit by moving its tip slightly to
eliminate play. Inserts work spindle, applies dimaond dust with
wire to drilling point, and removes jewel when spindle spring
opens and thus indicates hole is drilled. Inspects holes for
size by manaully turning them on standard bit used as gauge.
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Jewel-Hole Driller
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