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November 1998

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Subject:
From:
"Stephen R. Gregory" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Sun, 1 Nov 1998 14:22:02 EST
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Hi All!

     This is a tip I discovered yesterday that works so good I thought I'd
share it with ya'll. We had a customer show up Friday afternoon that needed
two prototypes built ASAP (don't they all)?.

     Feeling kinda' generous, or greedy (depends on your point of view), we
said we'd do em' and they could have them back on Monday morning.

     I went ahead and hand placed them since the most of the material for the
boards were engineering samples (strips, loose parts, etc.), but the one fly
in the ointment with these boards, was that they used a right angle press-fit
connector on them. It goes without saying that I wouldn't have any proper
tooling for the connectors, but I came up with a way to press them in without
tooling and it works GREAT!

     These were shielded ERNI connectors, about three inches or so long, six
rows of leads, right angle female types.

     I've got a manual arbor press, but not the support tooling for the
connector. So what I did was to manually place the connector in the holes and
get the tips of the leads to protrude just a bit out the backside (you should
be able to do this if the lead length is spec'd right). Then I took another
connector and placed the hole openings over the lead tips matching it
position-wise to cover all the leads, and used that connector as my "anvil" to
press the board onto the connector, which is backwards from what we do
normally.

     So basically, I had the board "sandwiched" between two connectors when I
put it beneath the arbor press head. The one  connector on the bottom was the
one being installed into the board, then you have the PCB, and then the
"anvil" connector whose hole spacing is an exact match and distributes the
pressure equally, and supports the laminate around the holes to press the PCB
onto the pins...it doesn't hurt the "anvil" connector either!

     You wouldn't want to have to do a bunch this way, and this only will work
with right angle connectors, but in a pinch this works great!

-Steve Gregory-

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