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This gauge provides a simple and inexpensive tool for quickly determining the accuracy of a punch apparatus setting.
English (United States)
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Multilayer Ceramic Via Hole Centrality Master Gauge
This gauge provides a simple and inexpensive tool for quickly determining
the accuracy of a punch apparatus setting.
In multilayer ceramic fabrication, via holes are punched in a green ceramic
sheet. The sheet is located for the punching operation by a number of
registration holes in the sheet. The accuracy of the punched holes relative to the
registration holes must be periodically checked to assure accuracy of the punch
As shown in Fig. 1, a typical green sheet 10 uses four or more registration
holes 12 to centralize the via pattern 14. The master gauge consists of 4
registratration pins 16, a chromed glass master with 5-mil black dots 18 precisely
located and bonded to a metal base plate 20 so that the center of the glass
master and four locating pins coincide within .0001 inch. In use, the punched
green sheet 10 is placed over the registration pin 16 and the punched pattern 14
viewed through a microscope to determine the amount the pattern is off location
by viewing the area of the black visible portion of the dots through the via holes.
Fig. 3A illustrates the appearance of the black dot 18 in a via hole in pattern
14 as it appears when the punch is in perfect adjustment. Fig. 3B illustrates the
appearance of the black dot as viewed through the hole in the green sheet when
the pattern is off registration.
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