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I know didly squat about lathes but for astro gear whatever you get needs to be able to cut both metric and imperial threads of various pitches (24 TPI is a common thread pitch as is the t mount 42mm diameter 0.75 mm pitch.) I presume lathes come with the ability to do this. The lathe will need to be able to cut thread on the inside and outside of 1 1/4 inch to 3 inch tubing. Apologies if this is too obvious - as I said I know very little about lathes.
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