John, re: "you can use the graduated dials for splitting the degrees further to minutes and seconds, "
How accurately can you manually dial in minutes or seconds on a rotary table? Or even a lathe or mill?
And now I can blame ae Age Virus for not being able? see the dials.
Ralph
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Clausing 8520, Craftsman 12x36 Lathe, 4x12 mini lathe, 14" Delta drill press, 40 watt laser, Consew brushless DC motors and a non working 3D printer
