How Cold Is It In My Shop?

Outside temperature is finally out of the teens but it is not much warmer in the garage even with an electric heater running. When trying to pick up small tools or parts with numbly cold hands, it is unpleasant. If I planned to stay here another year, an A/C would make sense.  I had one in the last house and it was very nice.

My last 1/8" carbide endmill broke a week or so ago so I have been using a 3/16" carbide endmill with fewer broken tragedies.  I needed to use 1/8" again to make best use of a scrap 1/2" thick piece of CFC. Even 5 inches/minute was a bit much at .01" cutting depth.  Fortunately, it broke right at the holder so I was able to salvage the lower half. (Now using 1 inch/minute.  Slower but surer.)

I had made the part that I needed yesterday but after polishing it on the lathe is realized it was cut from a 3/8" thick piece not 1/2".  So I am trying again.

The CFC extension tube is a very thin wall.  Thick wall CFC tube is scarce and expensive.  I need to put a thumbscrew in the wall to lock an eyepiece in place. This wall would not thread well so I have made a CFC ring with a 1.6" diameter and a 1.345" interior hole to epoxy onto the CFC extension tube. Then I can tap this 1.6" diameter assembly to get a nice thread for the thumbscrew with a similar appearance to the extension tube.

UPDATE: This was the first attempt at the ring.  When first out of the mill, it was a bit too small.  I bored it in the lathe just a bit too large 

Here you can see it has cut the 1.345" ID hole into which the extension tube goes.  Now it is cutting a 1.60" OD circle