Thanks Matt and Col for the encouragement.
Matt, I'm not sure about agricultural, you seem to do a good job. The approach one takes to ATM is largely determined by the available tools, machinery and metrology.
Meanwhile my progress with the CDK has slowed down a bit - one needs to earn a living too.
I finished 3D printing all the components of the spider and front ring. Next I need to make a large precision jig for bonding the spider to the focuser in such a way that everything is perfectly round and concentric, and the vanes are slightly tensioned when the whole assembly gets bonded to the CF tube.
I purchased a bunch of temperature sensors and had to make the housing myself because the commercially available housed sensors are about 50mm long. Mine are 20.
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