Just curious,

How many board shops are still using color coding to control the number of
re-sharps?  Currently, we primarily use flute length to control our
re-sharps. However, we think we are finding a significant difference of how
many re-sharps different re-sharp houses can get when a shop only specifies
flute length. We have learned that depending on the re-sharp house and
specific operators, the amount of flute removed when re-sharpening can vary
from as low as .0015 mils up to .007 mils. This would suggest that the
number of hits a drill sees before it is discarded for flute length can vary
by as much as 3-5,000.

The reason for this posting is due to a recently seen increase in drill
debris. Especially on .0135 holes. We are thinking that there may be a
significant difference in the evacuation properties of a bit that has been
re-sharpened 4 times ( or 6,000 hits ) verses a bit that has been
re-sharpened 6 times ( or 9'000 hits ).

Any thoughts on this matter?

Ed Cosper
ABC

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