I've gotten some great comments on attaching lugs to our CCA. One thing
I was surprised about was that no one seemed to have a problem with
screwing something to a multilayer plated through hole. For some reason
I always thought that was a bad practice. I always thought that you were
only supposed to screw to a non supported hole. Maybe I was wrong.

Phil mentioned below to roll swage and then solder to a pad. Again I
thought that was forbidden on a PTH. J-Std-001 6.2.5 says that you can't
do that. 

Comments?

Thanks,

KennyB


-----Original Message-----
From: Phil Nutting [mailto:[log in to unmask]] 
Sent: Friday, September 21, 2007 5:09 AM
To: TechNet E-Mail Forum; Bloomquist, Ken
Subject: RE: [TN] Screwing to a PWB

Kenny,

This is a common problem for us.  Several solution are as follows.

1. Swage in threaded standoffs by RAF, Lyn-tron and Promptus can be roll
formed into the board and then soldered.
2. For real heavy leads (6 to 00 AWG) PEM press in studs designed for
grounding applications work well.  We have some we torque to 55 in*Lbs.
We do solder these to the board.
3. For anti-vibration we use Nylon patch screws/bolts or nuts.  Check
out ND Industries, Long-Loc or Nylok.  There are several other
competitive products.
4. For connections screwed directly to the boards we use Keystone 6-32
or 10-32 Insert Terminals (Keystone p/n 1284 & 1293).  We have tried
some of the PEM pcb fasteners, but they were always problematic for
assembly folks.

Phil

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