Report Cloud to CAD fail can you tell me why ?

Advanced techniques applicable to any version of CMM-Manager
Post Reply
Thachhoang
New User
New User
Posts: 2
Joined: Wed Nov 13, 2019 4:35 pm

Report Cloud to CAD fail can you tell me why ?

Post by Thachhoang » Thu Dec 19, 2019 8:36 pm

I measuring a part with the vision system. The upper tolerance is .015 and and low tolerance is .005. The Y value is in positive but in 3D value it is negative. Why is it ?

Sorry for my bad english

Picture in attachment
You do not have the required permissions to view the files attached to this post.

User avatar
CMM Guru
Moderator
Moderator
Posts: 38
Joined: Thu Feb 24, 2011 7:49 pm

Re: Report Cloud to CAD fail can you tell me why ?

Post by CMM Guru » Fri Dec 20, 2019 11:31 am

Could you please tell me which version of CMM-Manager you are using?

Thachhoang
New User
New User
Posts: 2
Joined: Wed Nov 13, 2019 4:35 pm

Re: Report Cloud to CAD fail can you tell me why ?

Post by Thachhoang » Fri Dec 20, 2019 12:30 pm

Hi! I used the 3.8.2.6359 (2018-0927) version

User avatar
CMM Guru
Moderator
Moderator
Posts: 38
Joined: Thu Feb 24, 2011 7:49 pm

Re: Report Cloud to CAD fail can you tell me why ?

Post by CMM Guru » Fri Dec 20, 2019 12:33 pm

I tried to attach a .docx file that describes some recent changes to non-symmetrical tolerance output, but .docx is not supported...

Are you still eligible for upgrade? 3.9 SP1 and 3.9 SP2 include some changes to this output.

If you send an email to cmmmgr.nm@nikon.com, I can send you a copy of the document.

User avatar
CMM Guru
Moderator
Moderator
Posts: 38
Joined: Thu Feb 24, 2011 7:49 pm

Re: Report Cloud to CAD fail can you tell me why ?

Post by CMM Guru » Fri Dec 20, 2019 12:44 pm

Also, if you could open this program (so you can see this report) and go to the "System Pearl" (the yellow orb in the upper left) and do Send To Helpdesk and send us the helpdesk file we can actually look at the values and results to better determine how the program was set, and what the calculation should be based on that.

ken60
Power User
Power User
Posts: 78
Joined: Fri Mar 21, 2014 12:32 pm

Re: Report Cloud to CAD fail can you tell me why ?

Post by ken60 » Mon Dec 23, 2019 3:14 pm

Just make it simple this way, xyz value are location from part coordinate system and 3D value is for plus or minus material. In your case the y value bigger in y positive direction from y0 there fore that location missing material

ken60
Power User
Power User
Posts: 78
Joined: Fri Mar 21, 2014 12:32 pm

Re: Report Cloud to CAD fail can you tell me why ?

Post by ken60 » Mon Dec 23, 2019 3:28 pm

Just make it simple this way, xyz value are location from part coordinate system and 3D value is for plus or minus material. In your case the actual value bigger than nominal value in positive direction from y0 there fore that location missing material

User avatar
CMM Guru
Moderator
Moderator
Posts: 38
Joined: Thu Feb 24, 2011 7:49 pm

Re: Report Cloud to CAD fail can you tell me why ?

Post by CMM Guru » Thu Jan 02, 2020 2:18 pm

I don't know if this will help, but here is a document that describes the differences and reasons for changes in Tolerance Reporting in 3.9 vs pre-3.9.

I still see some things that look odd in the original post, but we would still need the .cmp file to evaluate further.

Please note that, although it sounds simple, we cannot simply mark all plus value deviations as "more material". We must work in a RH rule system.

This means that on the RH side of a car center-line (+Y), a nominal of 100.00 with an actual of 100.23 would be 0.23 too much material and indicate as a positive deviation. (100.23 is greater than than 100.00). A number greater than 100.00 is indeed too much material.

On the LH side (-Y), a nominal of -100.00 with an actual of -99.77 would be too little material, but will indicate as a positive deviation since -99.77 is indeed *greater than* -100.00. In this case, a number greater than -100.00 (-99.77 is indeed greater than -100.00) is not enough material even though -99.77 is greater than -100.00.

-100.00 < -99.77 < C/L < 100.00 < 100.23

There are some potential workarounds involving some VB and taking absolute values and reporting.

(NOTE: And, it is not as simple for reporting as taking the absolute values and using them. This creates a problem with a value that is supposed to be zero, or near zero. A nominal of 0.5 with an actual of -0.7 using absolutes would result in a deviation report of +0.2 which is not true. The deviation is -1.2!)
You do not have the required permissions to view the files attached to this post.

Post Reply