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Date: | Wed, 07 Jun 95 17:42:06 PST |
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We just began a project requiring insertion of Harting brand
connectors into boards with OPC over bare copper.
pitfall 1: board thru-holes (drill) were too small and some pins did
not seat. Insertion force was 2X the expected level
pitfall 2: boards with enlarged thru-holes, but barrel copper plating
thickness was less than specified by Harting. Some barrels were torn
by the inserted pin, and nodules of copper were stuck to the pin tip.
pitfall 3: to reduce the possibility of barrel damage, we are
lubricating pins before insertion with socket lubricant. Lubricant
reduced the pullout force very slightly, but not a problem. Very low
occurrence of barrel damage.
In the future, we plan to use thicker barrel plating. Hopefully this
will prevent the barrel tearing without greatly increasing the
press-in force.
Harting said they had little experience with non-tinned boards.
They've been helpful.
Allen Ahlert
Hitachi Computer Products
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______________________________ Reply Separator _________________________________
Subject: Press fit technology on ENTEK boards...
Author: [log in to unmask] at halsic_ccsmtp
Date: 6/7/95 3:44 PM
Hi
all,
I just joined the forum as a result of "surfing the web" into the
IPC home page and reading all of your interesting mail. I was
particulary intrigued by the discussion on ENTEK materials as we
are in process here at Teradyne of implementing ENTEK on all
our SMT/Mixed technology boards. We are also faced with having to
use ENTEK on some boards employing press fit connectors.
Question: HAVE ANY OF YOU WHO ARE USING BARE COPPER/ENTEK USED
PRESS FIT ALSO? IF SO, I WOULD BE GRATEFUL FOR ANY ADVICE
AND/OR PITFALLS.
Thanks,
Dean Barham
Mgr. Mfg. Eng.
DFM Technology
Teradyne, Inc.
Boston
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