Fixed rad... am I doing it correctly

Hi folks
I have a crappy feature to try and measure (Image enclosed). It's a R75.0mm milled arc, only about 4% (14º) of the circumference to measure on a fairly large rad.
I'm working from CAD and I'm starting with a fixed rad circle with 30 points (I have no scanning head), then aligning on that FR circle, doing a 2nd fixed rad circle, again 30 points and aligning now on that 2nd FR circle, then taking a 3rd circle, but least square this time, again 30 points. I'm getting fairly large errors from print, which may well be absolutely true, just checking if I'm approaching it correctly and my results are as trustworthy as possible?
Thanks folks

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picklefactory over 3 years ago

Lovely.... a lot easier than I thought. Thanks again for the advice, much appreciated for us part time amateurs.

Errr......2nd question though, that gives me a good result on the polar rad..... is there a similar clever way to find the actual centre point? For the fixed rad, I'm obviously telling it where the theoretical centre is. Or is that a step too far for such a small amount or arc?
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picklefactory over 3 years ago

Lovely.... a lot easier than I thought. Thanks again for the advice, much appreciated for us part time amateurs.

Errr......2nd question though, that gives me a good result on the polar rad..... is there a similar clever way to find the actual centre point? For the fixed rad, I'm obviously telling it where the theoretical centre is. Or is that a step too far for such a small amount or arc?
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