Josh is right on the bracket.
I have a spare here and was going to send a photo.
I'd like to add the the mounting bar has a 90 degree bend in it
which adds a lot of strength. I believe a single bar
I was spoke with Todd from IMSAI.net and he schooled me
about the important of the strain relief. Failure rate on systems
with no strain relief on the front panel switches is much higher.
If you think about it a lot of pressure can be exerted on the switches
especially when your debugging and frustrated. The reset and run
switches are usually the first to go.
On 12/ 9/14 03:14 PM, Crusty OMO wrote:
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: [email protected]
Subject: Re: [N8VEM-S100:5804] Re: NKK Switches for Mini FP
Date: Tue, 9 Dec 2014 17:32:53 -0500
To: [email protected]
I don't have my IMSAI a disassembled but that kind of bracket did it use?
Sent from my iPhone
On Dec 9, 2014, at 4:07 PM, Don Caprio <[email protected]
<mailto:[email protected]>> wrote:
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.
On Tue, Dec 9, 2014 at 2:07 AM, Frank Schieschke
<[email protected] <mailto:[email protected]>>
wrote:
Hello,
see also this thread
<https://groups.google.com/forum/?fromgroups=#%21searchin/n8vem-s100/bracket/n8vem-s100/npqHWFKLBys/i7L2hxM7djwJ>.
For one that is interesting by building it by yourself, i
provide the DXF file attached.
Frank
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