What I did was take a micro depth gauge (like the kind you use to
     check drilled holes into back up) and hand lap or grind the 
     replaceable pin into a knife point. This measuring device has an
     adjustable zero where, once you've replaced the knife point, you can
     zero adjust against a granite table then use to find your v score
     depth on one side. Turn the panel over and check the other side. You
     can mic in the board to determine over all. After your done you can
     replace the pin with the normal one and have your operators go back
     to checkin' drill depth.
     
     Groovy
     
     Short, Sweet, and Simple <and in .0005" increments>
______________________________ Reply Separator _________________________________
Subject: FWD>FAB- MEASURING DEVICE F
Author:  [log in to unmask] at SMTPLINK-HADCO
Date:    5/3/96 12:44 PM


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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