[ARC5] [Milsurplus] Control Box Mounts

[J. Forster]

Thanks.

The "butterfly" springs just look like a disk of shim stock with two
shallow bends and seem pretty easy to fabricate.

There was a reference for the post for the slide catch post to McMaster a
while ago, but they seem pretty straight forward to make on a small lathe.
I don't know if the current commercial posts have the safety wire hole.

While all the parts seem to be makable, when you add it all up, there are
a lot of operations to make a complete mount.

Best,

-John

================


> That's correct.  The key is making the inside of the "U" ~.005" larger
> than the .063" dimension of the control box bottom plate so that it will
> slide into the "U" without a lot of fiddling and forcing.  In the
> 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.  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.
>
> You really want to use an alloy that is designed for braking - 5052 is
> the closest I have found to the original ARC specification.  You can
> anneal some of the more common alloys like 6061, but they discolor in
> the process and it is cheaper to just get the right stuff off of ebay.
>
> Best 73,
> Mike
>
> On 6/5/2010 6:32 PM, J. Forster wrote:
>> I just looked at a similar type mount and the rear catchs were bent into
>> a
>> "U" rotated 90 degrees CCW.
>>
>> On the plus side, there are no "dished" areas on the mounts. They are on
>> the CB underside. This makes it easier.
>>
>> Best,
>>
>> -John
>>
>> ===============
>>
>>
>>
>>
>>> On Sat, Jun 5, 2010 at 12:44 AM, Mike Hanz<aaf-radio-1 at aafradio.org>
>>> wrote:
>>>
>>>> Steve KB4DMF was making these for a while, but I'm not sure he is
>>>> still
>>>> in the business.
>>>>
>>>
>>> Isn't he the gentleman who was also making shock mounts?  Last I saw,
>>> that was all he was making.
>>>
>>>
>>>> manual. Â The only thing missing are the dimensions of the folded over
>>>> portion, with the milled cutouts along the top, but those and the
>>>> location of the snap slide stud can be inferred from an actual control
>>>> box.
>>>>
>>> When I made 1:1 scale drawings using proportional dividers, I was able
>>> to dimension these fairly closely from the original drawings.  I can't
>>> say they were perfect but it did work and appeared correct.  One thing
>>> I did was to anneal the aluminum first (I'll be darned if I can
>>> remember what type I used but it wasn't 5052 nor was it anything like
>>> 2S.  2024?) to make the fold easier.  When I compared mine to a "real"
>>> set of mounts, I found my fold wasn't quite as it should have been but
>>> it did work.
>>>
>>> Those drawings got left behind when I moved here and I have to make a
>>> new set.  Darn it.  But then I left my metal shop behind too and
>>> that's slowly getting rebuilt now.
>>>
>>> Best regards,
>>>
>>> Michael, WH7HG
>>> --
>>> http://www.nationalmssociety.org/chapters/NTH/index.aspx
>>> http://wh7hg.blogspot.com/
>>> http://kludges-other-blog.blogspot.com
>>> Hiki Nô!
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