A proper probing routine should be able to do that very easily and accurately. I've done it many times. Do a fast probe to find the approximate center, move to that point, then repeat doing both fast, then slow, probes to find the exact center. Using a rigid probe, you should easily be able to get within a few tenths, assuming your machine has no backlash. You'll never get that close doing it with a camera. The best I could ever do was several thou, and even then there's a lot of guesswork involved.

Regards,
Ray L.

--- In DynoMotion@yahoogroups.com, Michael Rosenfield <mrosenfield@...> wrote:
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> There are times when I have to locate off the center of large holes, and probing these is very fussy too!Camera was only $60, so I thought I'd give it a try. Michael
> To: DynoMotion@yahoogroups.com
> From: jagboy@...
> Date: Mon, 2 Jul 2012 19:07:51 +0000
> Subject: [DynoMotion] Re: machining camera
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> And a camera is a very inaccurate way of setting up a machine, and VERY fussy to setup. You're far better off just using probing, or even a simple mechanical edge finder.
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> Regards,
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> Ray L.
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> --- In DynoMotion@yahoogroups.com, Tom Kerekes <tk@> wrote:
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> > Hi Michael,
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> > Â
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> > No KMotionCNC doesn't have such a screen. I've often considered adding such a screen but it hasn't happened.
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> > Â
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> > Regards
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> > TK
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> > From: mrosenfield2 <mrosenfield@>
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> > To: DynoMotion@yahoogroups.com
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> > Sent: Sunday, July 1, 2012 7:02 PM
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> > Subject: [DynoMotion] machining camera
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> > Â
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> > Tom,
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> > I bought a little machining camera from CNC4PC to use in zeroing my mill.
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> > Apparently the only software for doing this that is available anymore is the digitizing software resident in Mach3.
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> > I am using KMotion - didn't really want to use Mach3.
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> > Does KMotion have any capabilities for doing this?
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> > Thanks,
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> > Michael Rosenfield
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