Accurite Measurement Of A Long Shaft

I think you'll have some room for error as the dial collars and the handle are used to take up the slack, so I would think you could be a eighth inch off and be ok, I just had my x screw undone last night, was getting ideas for mounting the timing pulley and servo for my cnc conversion, I will make a spacer for mine to replace the dial and collar. See when you tighten and loosen the screw it moves before the table, with the handle off on one side, that's the room for error, I don't want to explain everything but you preload the screw aorta thing. Using a tape measure will be plenty accurate.

Let me add, the shoulder to shoulder is irrelevant because the table is being moved from the outside, the handle side. if you can picture that...
Wait lol, I'm not done, if it's too long it's bad, but if your under your ok.
 
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G'Day Ski,
I have used my lathes DRO for similar measurements, Clamped a parallel in the toolpost, brought it up to the chuck body and zeroed,wound the carriage out to the required measurement, rested the shaft on a chuck jaw and the parallel and scribed from below.
Regards,
Martin
 
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