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Date: | Fri, 17 Jan 1997 05:09:49 EST |
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TO: I4235700 IBMMAIL new address for ipc technet 25.6.96
FROM: DSTEWART EX2 D.Stewart - Product Development Manager.
DATE: 17 January 1997
SUBJECT: DRILL SPINDLE RUNOUT
Most modern drilling machines use lasers for checking tool diameter
, broken drill detection and spindle runout. The spindle runout is
checked dynamically, and typically will be run up the whole
spectrum of rpm range. This also helps identify areas of resonance
that should be avoided as speeds when drilling boards. The runout
for the spindle should be checked using a 1/8" drill BLANK, the
runout measured with different size tools is affected by the
concentricity of the drill bit and may reflect more on poor tools
than poor spindles.
We run with a maximum of 4 tenths of a thou runout, cleaning
collets, replacing collets or replacing spindles to bring the
figure back down to below this level.
Dougal Stewart
Exacta Circuits
Scotland
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