Monday, November 4, 2019

Diagonal Holder Complete

I bought the spider from Astrosystems.  A nice piece of work far better than the rest of the hardware goijng into this rebuild of Tiny.  But he does not make diagonal holders small enough so I built my own:
The 1/4"-20 screw goes through the center (thorax?) of the spider.  The wing nut holds it in position.  The four 8-32 socket head screws move the aluminum 45 degree piece back and forth against the acorn nut (which has a 1/4"-20 hole through it).  The mirror holder is 1/25" diameter aluminum rod turned and bored to accept the head of that 4" fully threaded 1/4"-20 screw, then milled at a 45 degree angle on the mill.  The spider is in the tube, and when this is in place, the mirror holder is under the focuser.

Tomorrow, I will have Signs by Smith powder coat it flat black.  I thought of black anodizing the aluminum, but the minimum shop charge plus the fact that some of the steel pieces are shiny and can't be anodized, made powder coating seem the best choice.

I thought they did powder coating.  I guess not.  I believe you can electroplate steel black.  Any of you ever done that?

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