3D CURVE/PROFILE HELP

[[Mi...]]

Happy Friday folks,

I have a something weird that is happening and I am turning to you intelligent folks to see if y'all have a solution for me.
We have this part pictured below that is a Limited Dimension Print and that has a profile callout of .010 to A B C. I am creating a plane for Datum A( X= Datum A). Datum B is a thru hole that runs through to the opposite of Datum C, I am creating 2 circles and recalling that into a 3d Line.
Spartial - Datum A(Plane)
Plannar - Datum B(3d Line)
X - Datum C(Plane)
Y - Datum B(3d Line)
Z - Datum A(Plane)

I am using using the 3d Curve feature and scanning the profile of Curve 18 and Curve 19. I did this my using create feature. After sectioning the profile and selecting the lines I created the 3d curve profile. The issue I am running into is, the profile for Curve 18 is kicking out, but Curve 19 is not. (I've attached the plots for visual reference) I reran the part using position of both radius to the same Datum structure and they're within .0005. With a height gage we are getting the same readings as the position so why is the profile kicking out?

We have 3 others that are familiar with Calypso just as stumped as I am.

Thanks in advance for any input y'all may have.

Regards,

ZEISS FORUM POST.pngScreenshot 2022-03-18 075119.pngScreenshot 2022-03-18 075150.png

[[Da...]]

What is the tolerance ?

[[Mi...]]

Please sign in to view this quote.

.010

[[Ch...]]

Mike,

Hi. Happy Friday. Couple of questions : Is this an ANSI or ISO drawing/part ?

Regarding 3D Curve - how are you reporting surface profile to datums with 3D Curve? This would be better suited for FreeForm surface ( you could use 3D Curve to help create the measuring paths - I do as well sometimes ). Also, are you measuring just one line segment/cross-section ? We cant tell how deep or thick this part is, but normally you should measure 2-3 cross sections for profile of a 'surface'. For profile of a 'line' obviously one cross section is fine.

Regarding DRF ABC, Have you tried -A- as spatial (Outer Tangential), -C- as tertiary, X = -C-, Y= -B-, Z = -A-
If you follow can-may-must then sure -B- can be planar/clocking/tertiary however, just to to experiment with another option.

3D curve as you're probably aware is pretty involved for the settings - have you been to 3D curve class? If not, there may too much to explain here - but one tip is to be careful when creating a 3D curve on an arc, you want to make sure you normally start and end on fairly flat surface - you may have to copy/paste move around some nominal points.

From the graphs posted .. the bottom one looks like there could be shanking or measuring issue in the small radius, are you sure it is measuring clean in that area ?

Let us know and we can help further... Cheers!

[[Mi...]]

Please sign in to view this quote.

Is this an ANSI or ISO drawing/part ? ANSI.

Please sign in to view this quote.

1 line segment..

Please sign in to view this quote.

This is what we are using.

Please sign in to view this quote.

I have not, I will give this a try.

Please sign in to view this quote.

I have not been to the class. We are hoping to go by quarter 3. We have 3 CMM's and only 1 uses curve, We have to justify getting curve and freeform for the other two then the class will be scheduled if they above the other licensing.

Please sign in to view this quote.

Yes, I looked under the scope at the radius myself and there is no burrs or chattering. This is done on a Wire EDM. The probe is not shanking out, as I used several different probe positions to eliminate that possibility.

Thanks for your input/recommendations.

[[Ro...]]

Hi Mike,
I would try and gather as many points as possible on the axis of Datum -B- by measuring each side as a cylinder, after your initial alignment, and recall those into a new cylinder. Since you're only using 2 circles, and the distance between them is pretty far relative to the rest of the geometry, any little form/size deviations on those circles inside could be creating a skewed centerline. It may or may not help, but I would give that a try.

If it's showing that the radii are in using position, you may be getting a false reading because the radii have no opposing points in the Y axis and it's using a different fitting method and calculating a location based on a center, not on the surface points themselves, like profile does.