Mail*Link(r) SMTP               FWD>FAB: MEASURING DEVICE FOR V-CUT

Roland-

Some "screw thread" micrometers have conical pointed anvil and spindle faces.

Another way is to modify a "blade" micrometer, the blades generally are about
0.7 mm thick by 6 mm wide, and are generally used to measure narrow grooves
and key-ways.  Most blade micrometers have a nonrotating spindle.  Careful
modification of the "blade" by precision bevel grinding the width of the blade
will allow you to form a small radius or flat surface like a "dull-knife blade
or screwdriver".  A small radius or flat blade anvil allows you to use gauge
blocks for reference calibrations.  If you form the anvils into knife edges,
you must use optical calibraton so as not to damage the anvil edges.  You also
must be careful on torquing the spindle as a knive edge could cut into/through
the "V" groove.    A small radius or flat anvil lets you measure very close to
the bottom of the groove, and if you know the groove angle, you can develop a
conversion table for depth.  Most blade micrometers I'm familiar with only
have a 25 or 50 mm throat, so they are limited in reach, not to say though a
"deep" throat micrometer couldn't be modified.

Ralph Hersey
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--------------------------------------
Date: 5/3/96 2:59 AM
From: Roland Jaquet
Does anybody knows / sales a micrometer with two facing V's
in order to check the remaining core after a V-cut / scoring ?

Where can i find a standard for it ?

It seems that not only the remaining core is important, but
also the sharpness of the cut. If the edge of the cut is rounded
it is much more difficult to depanelize...

Thank you, Roland
Roland Jaquet         Technical Director
Henri Jaquet SA       PCB manufacturer
Geneva Switzerland    Prototypes and small qties
tel. xx41-22-794-7878 fx. xx41-22-794-3052
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Subject: FAB: MEASURING DEVICE FOR V-CUT
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