[Elecraft] 2D Fasteners

[Wes Stewart]

Don,

I've used angle stock on more primitive projects but if you look at the 
picture(s) you can see that the flat plates are joined with 3/8" square aluminum 
bar stock.  I used T6 material for its clean drilling and threading properties.  
The flat plates are all 6061-T6 material as well.  Everything was laid out on a 
granite surface plate with the work held vertically and layout lines scribed 
with a vernier height gauge.  The holes were matched drilled in the plates and 
bar stock.  The bar stock was threaded (8-32) and the plates drilled for screw 
clearance .  But because of the precise layout the parts were still interchangeable.

Everything was power sanded, dipped in a caustic batch to slightly etch the 
surface, water rinsed, dipped in an acid bath to remove the smut, rinsed again 
and then given a conversion treatment (Alodine).  All of the lettering was 
engraved and filled with India ink and a drafting pen.  All of this was SOP on 
the specialized test equipment we built at Hughes back in the day.

The only pieces in these two amplifiers that I didn't fab myself were the two 
clamps for the cold ends of the plate lines on the 8877 amp.  I did do all of 
the silver plating as well.

Wes


  On 3/16/2018 3:37 PM, Don Wilhelm wrote:
> Wes,
>
> If you are referring to the aluminum angle stock, I used that back in 1960 
> when constructing a amplifier.  I did not think I "invented" it, and at that 
> time I did not have a drill press, just a hand drill and a tap, so the holes 
> were not precisely spaced. It worked well, and complied with the TVI problem 
> of that time (put everything in a shielded box).
>
> 73,
> Don W3FPR
>
> On 3/16/2018 4:28 PM, Wes Stewart wrote:
>> Johnny come lately:  I invented them in nineteen seventy something.  And mine 
>> really are 3D :-)
>>
>> http://sadxa.org/n7ws/K7CVT_Amp_Input_Compartment.jpg
>>
>> Overall views here: http://sadxa.org/n7ws.html
>>
>> Wes  N7WS ex K7CVT
>>
>>
>> On 3/16/2018 12:36 PM, Wayne Burdick wrote:
>>> But they *do* allow you to join two enclosure planes while also supporting a 
>>> PCB or other hardware. That was the intent of the design. (I invented these 
>>> in 1998 :)
>>>
>>> Wayne
>>> N6KR
>>>
>>>
>>>
>>
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>