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Posted by Jim Wilkins on June 8, 2008, 12:22 pm
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> > On an edge finder there are two ends. =A0The end you use to find the edg=
e is
> > pretty straight forward, but the pointy end is supposed to be for findin=
g
> > the center of holes, but for the life of me I cant seem to figure out ho=
w
> > this is supposed to work.
>
> > Does any one here know?
>
> > --
> > Roger Shoaf
> > If you are not part of the solution, you are not dissolved in the solven=
t.
>
> Adjust the X and Y axis so that the pointed end of the center/edge
> finder is approximately in the center of the hole somewhat below the
> surface. With the spindle running slowly, move the X axis until you
> see the kick. Note the reading on the dial. Now move the X axis slowly
> in the opposite direction until you see the kick. Note the dial
> reading. Subtract the smaller reading from the larger. Now move the X
> axis toward the center of the hole for half of the calculated
> distance. The center finder is now exactly at the center of the hole's
> X axis. Repeat for the Y axis and you have found the exact center.
That may be more accurate if you have a well-lapped center finder but
the cheaper ones aren't repeatable to any better than I can feel with
a fingernail. I can barely make an old Starret repeat to 0.001" on a
surface-ground 1-2-3 block.
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> I use the finger nail method. =A0Tapped holes are going to be a problem th=