[Milsurplus] [ARC5] Control Box Mounts

[Michael Tauson]

On Sat, Jun 5, 2010 at 1:21 PM, Mike Hanz <aaf-radio-1 at aafradio.org> wrote:
> production design there are some stainless steel "butterfly" plates that
> are riveted to the mount to exert pressure on the back of the control
> box to avoid rattling, but frankly they are not needed unless you mount
> the mount in a vibrating aircraft.

Not all of them had this.  They may have been dropped, at least in
some cases, as an economy measure.

> Using a bar folder, you brake the
> aluminum to about 150 degrees, and then remove the workpiece and add a
> 1/16" shim along with a .005" shim under the "U".  Then you clamp the
> assembly in a press (or large vise) to complete the fold.  It's easier
> than it may sound at first.

A 5 ton press does this no problem.  It's light for some applications
but I never ran into them in my home shop.

> You really want to use an alloy that is designed for braking - 5052 is
> the closest I have found to the original ARC specification.

Yep, so true.  But I had 2024-T3 and a couple others on hand and this
was before eBay.  It was scrap material from when I was an A&P
mechanic and came from airframe work being done.  I kept some scrap
for my own use and I made the mountd from that.

Best regards,

Michael, WH7HG
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