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umahunter
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The Edge Technologies bar is using a special case of the RDM method where the diameters of the measuring surfaces are concentric with the center drilled ends so there is no runout and the reading at either end (hopefully) doesn't change as the bar is rotated so there is no need to rotate the bar. IMO, it is a small inconvenience to rotate the test bar and average the minimum and maximum readings so I'll save my $50 for other tooling.I watched the youtube video that Edge Technologies posted about using the tailstock alignment bar.
My question about using this bar is:
How do you isolate any change found on your dial indicator to be only due to the tailstock being out of alignment? There are many reasons to have varying readings on the dial indicator. Tailstock being out of alignment is only one.
My $0.02 is for you to save your $50 and use one of the methods posted above.
Mike