In article .com,
says...

Thank you very much for your replies.

By frequency spread I mean that the when heaps of crystals are lapped
at one time in the lapping machine, the difference in frequency from
one crystal to the another is quite big which is the frequency spread.
How Can I minimise this spread.

1) define "quite big" in numerical terms. What is the frequency
and what is the rms deviation?

2) have you done the obvious things such as

a) measuring the actual thickness of the finished blanks
and correlating that with the frequency variation?

b) controlled the other dimensions of the blank, as another
poster has suggested?

Jim


--
==================================================
please reply to:
JRR(zero) at pkmfgvm4 (dot) vnet (dot) ibm (dot) com
==================================================