Rich,
I had my IMSAI FP opened in the summer. The switches are all
screwed to a long flat bar made of aluminium.
The switches have two mounting flanges, but the flat bar is only
under the bottom flange.
The flat bar is drilled and tapped with 4-40 I think.
At each end of the flat bar, it has bent legs that reach the PCB
and it's screwed to the PCB there from the back.
Again these are drilled and tapped holes, 6-32 if memory serves.
I have had the bar removed, it requires the removal of all
screws from all swtiches and the PCB screws too of course.
The bar then slides out (down) from behind the soldered
switches.
Cheers,
Josh
From:
rich...@verizon.net
Subject: Re: [N8VEM-S100:5804] Re: NKK Switches for Mini FP
Date: Tue, 9 Dec 2014 17:32:53 -0500
To:
n8vem...@googlegroups.com
I don't have my IMSAI a disassembled but that kind of
bracket did it use?
Sent from my iPhone
Frank did a great job
on the bracket. He was
kind enough to build a
prototype and
shipped to me complete with
screws at his own expense.
Thanks again Frank. I
truly appreciate the effort.
The bracket in the dxf drawing
is great however I would
consider it a permanent part.
The bracket has to sit under the
switch flange. Screws pass through
the flange
and thread into the bracket. So once
the switches are soldered in the
bracket can not
be removed.
I took Franks bracket which was made
out of PCB material, cut a slot in one
side and
then was able to lift the bracket off
from underneath the switches. Had the
bracket been
made out of steel or aluminum it would
have gotten bent/distorted.
My modified design is basically just a
flat bar 1/2 inch wide with tails that
extend one
inch that can be use for mounting. You'll
have to cut, trim and drill depending on
your
chassis design. Two of these bars could be
used for the top and bottom of the switch
which would add more strain relief.
If we want a better bracket perhaps this would be
a better design. It could be used as
a soldering jig or a removable mounting bracket. It
will involve more effort/expense.
I'm thinking it could be made from PCB material and we
could have it done by one
of the board houses. I know my board house does these.
<SwitchBracketEnd.gif>
So what do ya think? Keep those suggestions
coming.
Thank you.
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