On 11/26/2011 6:43 AM, DougC wrote:
On 11/26/2011 5:33 AM, azotic wrote:

"DougC" wrote in message
...
On 11/25/2011 5:34 AM, azotic wrote:
Anyone ever try this methode. It seems simple and quick.

http://www.youtube.com/watch?v=ZfioLDhBNBQ

Best Regards
Tom.

Kinda like that.
I use a small sheet of glass instead of a brake rotor though.
The indicator feeler doesn't chatter on dry glass like it does on dry
metal.

(to use the coax indicator on real-actual-parts, I tend to squirt a
track of oil for the feeler to slide around in)

Would that be regular window glass?

I have a old glass table top about 1/2" thick 24" square that i might
try.

Best Regards
Tom.

Yep. Mine's not that big though, it came out of a flatbed scanner that
didn't have Win7 drivers available.

Aquarium (tempered) glass is a little more breakage-resistant, if you
happen to ever get your mitts on a broken aquarium.



...Also to be honest, I have no idea what the typical +/- is of the
surface of ordinary window glass. I'm just assuming it's much less than
.001", since that's all I bother with worrying about anyway.

One can see and feel .001" variances on pieces of milled metal and
nothing on window glass looks or feels even close to that big.

Well, the tolerances on size are pretty wild, but with how glass is
made, I would have to say on a single sheet that the thickness/flatness
would be pretty good..

http://www.tech-glass.com/glass-thickness.htm