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

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bloomquist, Ken
Sent: Thursday, September 20, 2007 3:52 PM
To: [log in to unmask]
Subject: [TN] Screwing to a PWB

We have some large lugs that we need to screw to a PWB. Several ideas
have been floated but I'm concerned about torquing against the pads of a
PTH on a multi layer board.

This is in a high vibration environment so they need to stay in place.
Because of the units design the wires cannot be soldered or the lugs
cannot be soldered or screwed directly to the PWB. They need to be
elevated on a standoff of some kind. One option was to screw the male
threaded end of a standoff to the board and then screw the lugs to the
other side of the standoff.

It seems like I remember some where in my gorilla bag that screwing
standoffs or anything else that needs a good electrical path was not a
good idea. These wires are 16 awg and there are four going to each lug.

Anybody want to chime in on this?

KennyB

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