Probe Contacting Multiple Surfaces

[[Da...]]

Hello,
Newbie here...I am sure this is probably a really simple question, but I am not even sure what terms to use to search for the answer.

I have a very small feature to measure - the diameter of the raised area. I am using the smallest probe that we have. What I am running in to is that I don't have a lot of area I can probe between the plane and the chamfer. The first couple of parts came out fine, but then I ran into the one shown in the screenshot where all the arrows are red and pointing outwards rather than along the surface. The diameter result is undersized, but when I measure with a blade mic, it is almost right on.

Am I correct when I assume they are masked because they are going the wrong way?
Am I correct when I assume the reason they are going the wrong was is because the probe is touching the plane as well as the diameter?
Is there a way to tell Calypso to ignore the plane and only consider where it is touching the diameter?

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[[Ma...]]

In deed your results are screwed by bad touch - can you get closer into material so it won't scan on edge?

Not sure how small is area vs probe radius. Sometimes i do control touch of face to get correct touch ( when face is not perpendicular to cylinder, or element is not fitting with BA )

You can even take points instead of scan.

[[Ju...]]

Do you have your circle path related to an adjacent feature (a specified depth from the adjacent plane)?

[[Ma...]]

You can assign a formula to the circular path:

getActual("plane_ ???").y so you can measure in the middle of your surface?!

[[Ro...]]

Crate a plane on the surface just above or below your circle path.
Create a secondary alignment (Resource>Utilities>Alignment) and input just this plane into the Rotation and X, leave the Y Z and Planar blank.
Now set this new alignment as the alignment of your circle, and the circle will move with the adjacent plane you set to always find that tiny surface.

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[[Mi...]]

Alternative method because I detest secondary alignments, in long programs they become really cumbersome and you have to flip back and forth between features and characteristics. Basically this will make it so you measure as close to the plane as possible so it doesn't drop off into the chamfer.

Take a Point on the plane.

Then in your circle, use a formula to pull the relevant coordinate, and add or subtract your probe radius plus extra for clearance.

So, I'm using a 3mm ruby, so I subtract 1.6mm to give 0.1mm clearance to the surface.

I only did a point here because all those inner surfaces are machined together so I'm not worried about any tilt error between the plane and diameters. If I was, I would measure the plane, then use a formula to pull X the same way, but also grab the A1 and A2 angles.

It does exactly the same thing as Roberto's method, just a different way of getting there.

[[Ch...]]

If you would like to avoid using formals as many of the methods above mention you can instead use the Projection options for Circles. Guide from the ZEISS Knowledge Base https://portal.zeiss.com/knowledge-base?id=1262073

In your case it may be best to use Working Plane > Measured Plans to set an offset from the top surface.