Reporting Surface Profile using Cloud to Cad Best Fit

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C2CGDT
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Reporting Surface Profile using Cloud to Cad Best Fit

Post by C2CGDT » Wed Aug 29, 2018 7:47 pm

If I need to report a Surface profile .020 to ABC of a feature, using cloud to cad deviation, and want to use the Best Fit option. Do I need to lock translation and rotation in X, Y, Z, axis that apply?

Is there a tutorial explaining this feature?

medupriest
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Re: Reporting Surface Profile using Cloud to Cad Best Fit

Post by medupriest » Tue Sep 04, 2018 11:00 am

If your profile is called to a ABC, you do not want to use best-fit, which would free up one or more of the constraining datums.

For example, if -A- is a planar surface in the Z+ direction and your profile call was to -B- and -C-, then you could select the best fit option and lock the X-translation, Y-Translation and Z-Rotation, because that is what -B- and -C- are constraining. You would then be allowing the freedoms that are only tied to -A-.

We have a (usually) weekly web demo that covers this functionality. It can be registered for at https://www.cmmmanager.com/demo/ if you are interested in seeing this done.

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CrashN8
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Re: Reporting Surface Profile using Cloud to Cad Best Fit

Post by CrashN8 » Mon Oct 29, 2018 5:49 pm

How to: Report Profile using Cloud to CAD Deviation

Ask and you shall receive. Here is a quick tutorial describing the procedure for reporting profile of surface using Cloud to CAD Comparison. I give two examples... One with Profile to A,B,C and another with Profile only to A & C.

profile_ABC.jpg

From the Report Cloud to CAD operation you can use the Best-Fit Clouds to CAD check-box and Lock check-boxes to release constraints according to the Feature Control Frame specified on drawing. For the example here we do not use best-fit for Profile to A,B & C... However, we do use Best-Fit option and un-check the X axis Lock check-box to release constraint of B Datum. Notice that B Datum is constraining X Axis translation, thus the reason that X Axis lock is un-checked. Additional note - The 3D tolerance is optional for reporting Profile, however please note that 3D tolerance will be used for Spike and Disc tolerance on graphical Report. You may set this tolerance even through the check-box is not checked.

profile_operation.jpg

When the X axis translation is unlocked the data points are best-fit to nominal CAD surface. The best-fit is limited to translation in X axis only. The release of this extra constraint yields a pass condition vs. the failed condition with all three Datums (A,B,C) Also notice that the Report best-fit xForm check-box is checked. This will provide additional report info that describes the translation and rotation used to achieve best-fit report. In this case the X Axis (0,01 vector) has been shifted by 0.064 mm according to report. This information is shown in the Transformation section of report.

profile_report.jpg
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Re: Reporting Surface Profile using Cloud to Cad Best Fit

Post by Racinslack20 » Fri Sep 20, 2019 9:18 pm

Not to try and hijack but had a question about this. In the example the ref frame is local to part. If my ref frame was off of part would i want to do best fit to CAD and then lock all constraints if i had a profile call out back to ABC? Also another call out back to A-B, so i would do as example 2 above? If i dont do best fit on first call out i get a really weird result. Like 30mm or even had 1300mm.

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Re: Reporting Surface Profile using Cloud to Cad Best Fit

Post by CrashN8 » Mon Sep 23, 2019 9:16 am

Does not matter at all whether Ref Frame is local to part. You only need to understand the relation of XYZ axes in regards to Datums in case you are using Locks with Best-Fit. If you have weird results with Cloud to CAD while not using Best Fit, then there is a problem in your program with alignment or CAD Sync.

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Re: Reporting Surface Profile using Cloud to Cad Best Fit

Post by FialekJared2018 » Tue Dec 17, 2019 3:45 pm

Hey guys, So I am kinda dealing with this right now with a customer. We have a profile call out of .08 with no relation to a datum or anything. Just straight measuring anwhere between point A (23mm from center) to point B (31mm from center). Currently doing 15 points using cloud to CAD deviation. When it reports I have it as the -0.04 and 0.04 for tolerance just like shown above in previous questions. I have attached a photo to this, what would be my outcome for the correct result relating to the .08 surface profile.
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Re: Reporting Surface Profile using Cloud to Cad Best Fit

Post by ken60 » Wed Dec 18, 2019 10:20 am


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Ryan Christopher
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Re: Reporting Surface Profile using Cloud to Cad Best Fit

Post by Ryan Christopher » Wed Dec 18, 2019 4:40 pm

If you are asking what is it that you should write on your report...

1. For me, I prefer to write down the "Dev" value times 2 (in this case .114). I have met other people that perceive that answer to be max deviation - min deviation.
2. Either way, ASME Y14.5 doesn't specify how the results should be written down. Y14.45 might be coming someday to give that guidance.
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http://www.vantagemeasure.com/

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