Measure a feature at a distance from a curve

[[Br...]]

I do not have PCM so I am trying to use a formula.
I want to measure a plane in the Z at a set distance from an arc (2d Curve).
What happens is if there is plus stock on the curve then the probe hits it on its way down to the plane.
I tried to get an actual from the curve and add probe diameter but I am not getting a result that will compute.
Is it possible to use a curve in a formula like this or should I use a different type of feature, like a space point to reference?

[[Da...]]

Can you recall the feature points of the curve into a theoretical feature (circle) and ask for the distance from the circle?

[[Ma...]]

I didn't understand your question.

When you are creating curve, you are using nominal at some point ( like from drawing ). So feature you want should have some sort of nominal position.

You can use max/min coordinate from curve.
If you have deviations on curve and want to measure something from curve bestfit, then use alignment from several curves, make theoretical point with this alignment - then recall this point to base alignment ( or feature alignment ) to use formula - OR you can use feature alignment setted from "alignment from several curves"

[[Br...]]

I do not have several curves, just a single curve so the alignment would not work.
Center of the arc is 0 in the Y axis but the plane nominal is 37" from center.
What I tried, and seems to calculate correct, is to recall the curve points into a circle, I could then use the formula box and set it as "getActual(Circle1).radius-1.5" which is the difference between the Y nominal of the arc and the plane and that computed to the same nominal as programmed.
I cannot test it right now because the stock is removed and the part is running fine with the original program.
Its mainly for setups that I needed a way to measure the part. Thanks for the help.

[[Ma...]]

There is alignment section on main menu -> Prepare - you can use alignment even for one curve - it's just named "alignment from several curves".

[[Br...]]

I did try the alignment but when I had just one curve and hit ok I got an error, can't remember exactly what it said but I had to cancel or it wouldn't let me go anywhere. I'll try again next week.
I was able to test the get actual circle radius and it did not work once I simulated a stock condition. I revisited the min/max of the curve and working from engine center, all with no success.
I decided to add a space point and referenced that in the formula and it worked as I thought.
I then extracted a point from the curve into a theoretical feature and it worked as well so I can get rid of the space point.
Thank you for getting the wheels turning. I spend most of my time programming the "other" software so I am still learning the in depth stuff.