How to measure hole on an angle.

[ChairsWithWheels]

Autoing the circle gives me a ellipse.

What's the best way about this? I need diameter and true position.

See the great picture below of a side view

image.png

[Mike Rivard]

Can you post a CAD picture?

[ChairsWithWheels]

image.png

[Smasherofprobes]

Individual trim points and a constructed circle/Midpoint? Is void detection throwing you off?

Could you not get your vectors from a surface point and then manually input location and size ? Just throwing ideas out there.

[R2ah1ze1l]

Use measured circle and adjust the Z value of the hit targets.

[markoor99]

Me too. or put in a pitch.

[Cris_C]

Turn on Void Detection from the Auto Feature window.

image.png

[ChairsWithWheels]

Tried what you said with vectors with surface point, however doesn't look like It'll know the proper diameter.

Also wouldn't let me adjust z-values, I'm guessing due to circles being 2-d features?
image.png

[R2ah1ze1l]

You cannot adjust the Z value with an auto-feature however you can with a 'measured' feature.
place your cursor in the edit window and start typing 'measured', make sure to change from point to circle where the blue text exists. Duplicate the XYZ/IJK/Size that your auto-feature showed. now you can equally space your hits and then adjust the individual z locations. I would continue to select 'no' about updating the feature as you edit the z heights.

[markoor99]

actually you can adjust each point individually with an auto circle. But you have to move one of the inside points (not beginning or end point) first by looking straight at it. after you move one of the inner points out of its "auto '" location, you can turn the cad so you are looking at the hole from a side-ish view and pull them in Z to where you would like them.

[ctw00]

I use pitch on holes like this, measure it as 2 halves, and then combine the points into a circle.

[ChairsWithWheels]

image.png
This is my only concern with void detection. This hit would be risky imo

[Cris_C]

Yeah, that doesn't look ideal. I guess that hole is too special for that option.

[ChairsWithWheels]

Ctw's pitch method in action, however, says the math fails when constructing a circle.
image.png

[jpesaturo]

What version PC-DMIS are you running?

I tried a quick demo model and an Auto-Circle seems to work just fine in 2020 R1 ...

image.png

[jpesaturo]

It's a Ø1.00" hole on a 10° slope ... Here's a closeup of the settings ...

image.png

[Mike Rivard]

Hold shift then click on the feature, It will make your vectors perfect to the surface!!

[Mike Rivard]

Or level to your 10 degree face and make a perfect vector circle 0,0,1 and then level back to the top face and the vectors should change with the new level feature I've had to do that before

[ChairsWithWheels]

The hole is not perpendicular to this surface, otherwise auto-circle would work. The milling makes it done at an angle to the surface.

[JacobCheverie]

Have you tried measuring the circle using a small pitch and then construct a cast circle onto a plane with the correct normal vector? This should work for location but not size. The measured circle itself should give a valid size.