roll reading on a cylindrical part.

[[Da...]]

Got a tough one. I have a customer who wants a size over a .750 pin that is contacting an od cylinder and a conical surface that's concentric to the cylinder, to the back end of the part ( plane). I've already worked out various intersection lengths and intersection positions, so the part is checked and good, BUT, he wants the " over the pin reading " included if I can...so Thems fightin words to me 🤣 🤣
Did this a long time ago but it involved planes , not cylinders and cones. I just have to get to the center of a circle that's tangent to both ACTUAL surfaces.

[[Cl...]]

Got a visual of said scenario?

[[Da...]]

Here's a clip

IMG_20200826_131228 (002).jpg

[[Ma...]]

This is ideal for curve and fit circle to curve.
Othervise it can be done with some math 😎

[[Cl...]]

Why wouldn't the Size > Distance > Caliper Distance (Plane/Center to Max Circle) work?

[[Ch...]]

I've never used the "Circle in contour fit" construction but would that work?

Recall the features into the curve.

[[Ri...]]

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This or measure two lines, and create a Tangent. Then you can use the Caliper Tool.

[[Ke...]]

I would love to know how a comparison between the Tangent method vs Curve in contour fit.... Tangent has worked for me 100% of the time; Curve in contour fit worked the one time I used it, but didn't seem as repeatable. Hopefully these are more "fightin' words" 🤣

[[Ri...]]

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My experience has been that it depends on how "smooth" your Curve is. If it's pretty rough then it has a difficult time calculating the fit.

[[Ma...]]

For me I don't have experience with tangents. I thought it is for tangent between two circles.

[[Cl...]]

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I agree. I switched to the tangent method from Contour in best fit, due to repeatability issues.

[[SH...]]

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I have used circle in Contour best fit but as you mentioned it is not repeatable.

I think it's good tool but we don't how to fire it in all cylinders.

[[SH...]]

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What is Max circle?. a circle with formula or theoretical circle?

[[Cl...]]

I think that Contour in best fit has too many ingredients that go into it's construction. The Tangent function is simple.

[[Da...]]

A job for curve

[[Za...]]

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[[Cl...]]

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[[An...]]

Things don't seem always to be complicated.
See attached.

Contribution_27_08_2020_a.pdf

[[Er...]]

There is no repetabillity issues with circle in contour, as a feature. As Shomaker mentioned, If you cant get it to repeat, then you should have a look at your curve, its most likely poor.

To get really good curve measurements can many times be a very time consuming job. It takes a little more effort then just slicing, throw in some points and apply suggested filter....

[[Da...]]

So, this is a cross section of a cone and a cylinder. Can't really recall the three circles of the cylinder into a cross sectional curve. Same with the 4 circle paths of the cone. There is also no model.

[[SH...]]

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Lot of options....

[[Cl...]]

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Curve scanned with CFS.0004 point spacing (1100 points) over the contour (40 degrees).
Filter setting (Spline 0.2500 mm), Outlier settings (Inside = 3/Outside = 3), only outlier.
What's missing here?

All done by Zeiss, and won't repeat worth a crap. I switched it to Tangent, repeats perfectly.

[[SH...]]

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I got better results when I masked the points in unwanted area.

We all so think about evaluation wheather it is mathematically fit a circle or not..

[[An...]]

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The option is right if the probe diameter is according the basic dimension.
Sorry,my fault!

[[SH...]]

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I have one request, your are doing great works but sometimes it is difficult to understand without writen explanation.