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Model makers layout dye is used as a plated thru hole (PTH) stain to observe and measure contact areas made by an insertable pin; i.e., a compliant pin type.
English (United States)
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Measuring Contact Area Using Liquid Stain
Model makers layout dye is used as a plated thru hole (PTH) stain to observe
and measure contact areas made by an insertable pin; i.e., a compliant pin type.
Prior to this staining technique, the actual contact area between a pin and
the PTH wall could only be roughly estimated. This technique provides enhanced
contrast between the area on the solder coated PTH wall that was wiped by the
pin, and the area that saw no pin interaction. Although this technique is
particularly useful for a compliant pin system, it could be applied to other contact
The PTH staining techniques comprises the following steps: 1) Clean the
card segment as needed. 2) Mate the segment of a card that to a compliant pin
assembly, and immerse in the stain (Layout Dye). 3) Maintain the segment in,
and covered by, the stain for one minute at room ambient conditions. 4) Place
the container, including the stain and the card seg ment, in a vacuum chamber.
The chamber is then evacuated to approximately 30 torr for one minute. 5)
Remove the card segment from the liquid stain and allowed to air dry; about 10
minutes. 6) Grind the card segment on 600 grit SIC paper (not critical) until the
back side (180 degrees to measurement area), of the PTH is removed. Continue
gentle grinding until the pin can easily be removed from the PTH. 7) Dry the
water that gets on the card segment during grinding with a blast of air. 8)
Examine and/or photograph the card on...