Need assistance with some geometry of a model.

[[Ri...]]

The blueprint wants the end of the depth of a curved feature to be 22.5° rotated from the Y axis (Normal to X).

See slot1 image simulating the angular location.

The problem I am having is figuring out how to measure the feature to produce the theoretical values as I have displayed.

Creating the nominal values, easy peasy (Although I have found my geometry is off by about .0007 in Y and Z, I think it's a model error).

The endmill that produces the feature is normal to my X axis, this is what generates the small flat (Plane) at the bottom (End of feature).

I can't figure out how to create a measured circle to represent the end of the feature, even my freeform scans are normal to my X axis, as created from Sections of the model.

The plane at the end of the feature is very small, not scannable or capable by points other than a single point for its depth.

I have a couple screenshots to share.

This is hard to describe, hopefully someone may be able to follow this.

[[Ch...]]

Rick,

are you reffering to this arc, see attached marked up pics..

If you're measuring a FFS for profile and the model is not correct, I would kick back to Engineering.

Is this is a curved cylindrical feature?, this would definitely be a challenge. Is there a surface at the bottom of it ? Since FFS does not really intersect with anything well, your best option might be to slice the CAD to create perhaps 3x 3d Lines down the curved cylinder. Measure a plane at the end, and hope that the 3D lines give you an intersection with the plane. When I need to use a plan for an intersection but do not have enough room for more than one point, I simply measure one point, select the plane from the CAD make it THEOretical then makes its actual Z the same as the measured point.

From there use the 3 intersection to make a circle to find your angle.

Crafty - but just might work.

[[Ri...]]

You are spot on and yes, it is a curved cylindrical feature.

I have created those small planes the same as you have described, now I will try your 3d Line suggestion.

Big thanks!

[[To...]]

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wouldn't that be a torus?

[[Ma...]]

For me it looks like helix path, so torus won't be a solution.

[[Ri...]]

It is a helix path when CNC generated for cutting.

[[Ch...]]

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By 3d line I meant 3d curve, I've had to use those to intersect a few times, it may give you multiple iterations which are really close.

Edited May 23

[[Ma...]]

Well 3D curve can be done with cut ( or intersection - don't know translated name ) by not plane but cylinder - so there you have your helix path from theoretical center of the groove.

But i am not sure how to obtain your needed dimension.

[[Ri...]]

We don't have Curve, just FreeForm.

What I ended up doing, is creating three lines near the bottom along the slope to create points projected to the theoretical plane and then create a circle.

Offline, it works. I will have to wait to try this online and see how it goes. There isn't a lot of curve on that surface for the last .100 of that helix path so I am hoping for the best.

[[Ma...]]

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 So you want to get angle of helix? That's your 22.5°?

That could be possible to calculate if you can get upper circle and lower circle. If you add a middle circle, then you can assume fixed axis -> now you have a radius.

With starting circle and ending circle you have your start angle and end angle - so now you can calculate length of radius. With length and depth you can calculate that angle.