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Registered Member #1497
Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
So I got tired of waiting for Fastenall to return my calls on whether or not they ordered my belleville washers (its been 2 weeks, they are no longer getting my business). I have been sitting on these aluminum bars for a while now, so I finally decided to drill the holes and bolt the things together.
Cost of aluminum bars ($3 per bar, 1-1/4" square, 4" long, likely 7075 alloy) Cost of bolts ($20 for all the hardware!!?!) Cost of SCRs ($5 a piece) Making your own SCR clamps (Priceless).
Anyway, onto the pics.
The new and improved clamp, the thing weighs about 750 grams...
For the insulation I decided to use 2 layers of protoboard chopped up and placed between the clamp, and an aluminum flat for contact, with a washer to concentrate pressure in the centre. Just to be safe I oriented the pads on opposite sides (so there is a 2-layer thick portion of fiberglass board to insulate). This was repeated on both sides of the SCR, so the entire clamp itself is floating.
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Building a SCR Clamp
