Steve,

I think your are stuck in a corner.  Our standard spacing for 1/2W resistors
is 0.15" between parts.  When 0.1" spacing is used every other part has to
sit up above the adjacent ones or stacked cord wood style.  Any chance the
board can be re-spun for the correct spacing. Alternatively could the board
have been designed with 1/4W in mind but 1/2W parts were specified?  Our
CS400E systems would have the same problem and our only solution was to
short term jam them together and long term prevail on the CAD department to
fix the board or change the wattage (assuming the circuit could stand the
reduction in wattage rating).

One problem we have encountered is on Metal Film resistors purchased from
Mouser when we order 1/8W we get a component that looks like old 1/10W
resistors from the '70s but our criteria was based on the RNC55 body size
and what we really wanted was the 1/4W body size.  Are you confused yet?
Inn looking in the Mouser catalog I don't see any way out for your problem
as all the 1/2W resistors are 0.137 in diameter and with 0.1" spacing there
will be an interference fit.

Best of luck.

Phil Nutting
Manufacturing Engineer
kaiser Systems, Inc.

-----Original Message-----
From: Stephen R. Gregory [mailto:[log in to unmask]]
Sent: Thursday, August 31, 2000 12:18 PM
To: [log in to unmask]
Subject: [TN] Small body diameter axial resistors...


Hi ya'll!

I think I might have talked about this in the past, but anyway, I've got
this
board here that has oh, about 375-390 axial parts in it. I auto-insert a
good
portion of it, but I can't do it all. That's because the resistors that are
used are 1/2 watt resistors, and there are many places on the board where
the
resistors are layed out on .100" centers next to each other, unfortunately,
the body diameters are larger than .100"...they range from .103-.107". Go
to:

http://www.driveway.com/share?sid=e25a88c4.8e904&name=Pictures

Look at respacing.jpg, and respacing2.jpg, and you'll see what I'm dealing
with. Right now, I insert every other one at the places that have the
resistors "brick-walled" like that, and then hand-stuff them at our CS400's.
But I'm looking to try and auto-insert more...the CS400's are stuffing 272
parts now and it's a big bottleneck.

I was told that there maybe some 1/2 watt resistors out there with smaller
body diameters. Philips carry some that they call "Space Misers" and they
are
smaller, but they only go up to 1/3 watt...

Do any of ya'll know where I might find some skinny 1/2 watt resistors?

TIA

-Steve Gregory-

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