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I believe they spec diameter, not radius. From the Shopbot website:

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Randy

The max diameter for the Desktop indexer is spec'd at 3.6". Is there any reason why the indexer could not be lifted by 1/4" so that a 4" diameter piece could be machined?

Randy

Signed up for a sample at Duna USA. I'll report back if/when I receive something from them.

Randy

Thanks for the reply Jerry. Is it Corafoam? Sorry to be picky but it seems all brands are not equal.

Randy

Does anyone have a sample/scrap piece of 15lb Corafoam that they'd be willing to send me? I'm happy to pay for it. I can get full sheets from a local dealer but I'd like to see how this stuff works...

I tried some more test cuts last night. When I first posted, I was cutting 3.000" diameter circles and they were measuring between 3.010" to 3.012" depending where on the circumference I measured...

Yeah, I'm definitely going to try leaving about 5 thousandths and then run a final pass the other way.

Dimensional accuracy of the bits has been brought up. I was assuming that the bit diameters...

I'm cutting in climb. I was thinking of reversing the direction of the extra last pass to cut in conventional to see if that helps. I'll report the result.

Randy

Just got my Desktop last week and started out by cutting some modeling parts out of 1/4" aircraft grade plywood (Midwest brand). The issue I'm having is if I, for example, cut a 3.000" diameter...