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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