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This is very impressive.
Can I ask what tolerances you are working to with the machining?
When you say the backplate was a challenge to get 'flat', what are you aiming for?
After dabbling with some machine work I have developed a much greater appreciation for tolerancing and metrology.
Flat for me is a multi faceted challenge of getting two sides flat, and parallel, and a certain distance apart. And then being able to actually measure the result with any degree of accuracy.
I've not found any specific advice for astro so very interested to find out how tight this work needs to be.
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