18 point primary mirror cell (just the frame) for 17.5" mirrors
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Selling a partially completed 18 point mirror cell for a 17.5" f 4.5 mirror (1.5" thick).
It's designed for a mirror box 19.5" on the inside, so the truss pole connectors would need to go on the outside.
This is just an Aluminum frame, 1" square tubing with 1/8" walls, and with 3/16" thick side rails, connected with stainless steel screws and push in tube connectors. Very light and very rigid.
Each side has two 1/4-20 threaded holes for connecting to the mirror box walls. There's only one such hole on the top.
Each of the mirror (bars, really) supports is a 3/8-24 threaded hole. There's also two 1/2" holes on the top for the sling supports, properly spaced to hang around the mirror sides. You may want to drill extra holes as you see fit.
I can also provide some sling material as needed. And of course the dimensions for the bars and triangles to go with this, and some 3/4-24 brass cap nuts if you want your bars to float on hemispheric caps.
$55 + shipping for the frame, sling material and the cap nuts. Paypal prefered, no fee.
The package weighs about 5 lbs and it's about 20" square by 3" height. originating zip code is 20007.
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