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Date: | Wed, 19 Jun 96 17:38:04 EST |
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Hi Bob;
In a prior life, when I used to try to do this in the press fit backplane
business, for a pin this size we would specify a finished hole size that was
something like .030" +/- .002". In addition, we specified solder plating
and reflow for the board, as the solder, being soft and malleable, would
lubricate the insertion of the pin through the hole and at the same time,
hold it in place until fusing.
However, the tighter hole tolerance and the requirement for solder plating
(or selective solder) present their own range of disadvantages and problems
for the board manufacturer. I would suggest that you try a small quantity
first, and get with your pcb manufacturer(s) for capabilities and
suggestions prior to doing anything serious.
Regards
Greg Schroeder
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Subject: assembly - pressfit connections
Author: [log in to unmask] at SMTPLINK-HADCO
Date: 6/18/96 7:19 PM
TechNet Users,
We are presently attempting to pressfit a rectangular pin into a
through-hole of an .062 inch thick PCB. The dimensions and tolerances of
the pin are as follows:
Length - .080 inches +/-.002 inches
Width - .032 inches +/- .001 inches
Depth - .125 inches +/- .002 inches
After the insertion process, the pressfit pin is wave soldered into place.
Therefore, all that is required of the pressfit pin is that it be retained
in the through-hole during normal assembly handling until wave soldering.
What should the through-hole dimensions & tolerances be to properly pressfit
the pin?
Thanks,
Bob Mykich
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