Measuring a Radius

[[Je...]]

I am not experience with measuring a radius. Could someone help me with how I go about it? Thank you!

[[Ro...]]

If the radius is small, i use probing points instead of scanning.

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[[Ri...]]

I have had great success scanning small radii and or small segments of radii, as short as 3 degrees.
I do not use this method on anything under 30 degrees of scan.

I create my geometry, generally 100% pure.
Open the feature and select "Evaluation"
Under Evaluation Constraints select Radius (Check box)
Close out the feature
Make a copy of the feature
Recall the original feature
Open the new feature and select "Evaluation"
Under Evaluation Constraints select X, Y and Z and un-check Radius (Check box's)
Close out the feature

The first feature will report coordinates accurately
The second feature will report the Radius accurately

You can create a theoretical feature from the first feature and the second feature that will have accurate coordinates and size.

At one time, someone called this the "Poor mans FreeForm". (I learned this on the old forum).

[[Is...]]

always funny to read about radius evaluation. ➡️

[[An...]]

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Constraining the diameter leads to severe uncertainty.
See attached.

Contribution_13_03_2020_1.pdf

[[An...]]

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Also leading to creative solutions. (in theory)

Contribution_14_03_2020_1.pdf

[[Lo...]]

Hi Andreas,
I would like to have more explanations about your attachments because they aren't for me clear enough.
This topic is very interesting

[[An...]]

See attached.

Contribution_16_03_2020_1.pdf

[[Lo...]]

Thank you so much...Andreas...you were really kind.
Really usefull this guide... 😉

[[Ri...]]

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The method I stated has been tested and proven to work when using features capable of comparator measurements (Comparison evaluations). Tested hundreds of times and used over thousands upon thousands of times.
Constraining the diameter has had no negligible affect on location (in my tests).
Conversely, recalling the initial feature and re-constraining has had no negligible affect on the diameter (in my tests).
If you step out of my initial parameters, issues do arise.
The "Poor mans freeform" has merit. (IMO)
I digress, my tests can have faults, its happened...meh...once or twice before 🙄

[[Wi...]]

I picked up on the constraints from an advanced class about 10 years ago. If applied correctly and you have less than 90 degrees constraints are the way to go... test it

[[Da...]]

This is how I check small radius and Tool radius.

I use a formula from the walls of the feature.
This works great for checking the radius. (If it is a realistic callout)

Capture3.JPGCapture2.JPGCapture1.JPGCapture.JPG

[[Me...]]

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Rick you do not have to go through all that trouble of recalling and creating new features to constrain. You can constrain the coordinates or the radius through characteristics as shown in captures below:

[[Da...]]

I think that you are looking at it wrong you cant restrain both XYZ at the Same time as Size.
That is why he is recalling it. If I understand Ricks comments.

[[Ia...]]

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Shawn is saying that you can use different constraints in different characteristics for the same feature. Instead of making two features, you can just evaluate the one feature differently in the characteristics.

[[Da...]]

Never used that before that is really cool.
I was using Rick's solution. Maybe it was because I was trained on 3.2 Calypso? LOL

Thanks
That can really save time
Dan