User defined dimension

Topics applicable to newer version(s) of CMM-Manager (3.0+)
Post Reply
jswope
Super User
Super User
Posts: 185
Joined: Fri May 17, 2013 12:50 pm

User defined dimension

Post by jswope » Fri Jun 12, 2020 9:54 am

Why is the out of tolerance graft bar in the red on a user defined dimension when the actual is the same as the nominal? This makes the dimension look out of tolerance.
Capture.JPG
You do not have the required permissions to view the files attached to this post.

User avatar
CrashN8
Site Admin
Site Admin
Posts: 550
Joined: Thu Feb 09, 2017 4:07 pm

Re: User defined dimension

Post by CrashN8 » Fri Jun 12, 2020 11:00 am

It's only OOT when the graph turns to number thus indicating the magnitude of Out of Tolerance. We do have plans to give user some more control over color shading used thus allowing upper limits of in tolerance graph to have different color. Also I think we made some changes recently for asymmetric tolerance that you are showing so that graph is centered and colored based on total tolerance range.

jswope
Super User
Super User
Posts: 185
Joined: Fri May 17, 2013 12:50 pm

Re: User defined dimension

Post by jswope » Mon Jun 15, 2020 6:12 am

Sounds good thanks Nate!

chuck swanson
Frequent User
Frequent User
Posts: 33
Joined: Thu Sep 18, 2014 9:50 am
Location: St. Louis

Re: User defined dimension

Post by chuck swanson » Wed Jun 17, 2020 1:50 am

I'm confused about this. The red graphs are correct. In both cases you are at the tolerance limits, so the bar should show this as it does. .0001 more and you are out of tolerance.

User avatar
CMM Guru
Moderator
Moderator
Posts: 99
Joined: Thu Feb 24, 2011 7:49 pm

Re: User defined dimension

Post by CMM Guru » Fri Jun 19, 2020 7:30 am

jswope. Indeed, your "in tolerance" based on your single sided tolerance definition is 2.480 > 2.500. And you are at 2.500. Just on the edge of going out of tolerance (on the G1 Go) plus. As Chuck noted, if your number was 2.5000000001 you would be out of tolerance.

The graph always shows your results based on the center of the graph being the *center* of your tolerance zone. In this case, your *center* is 2.490. If it didn't behave this way, you would always see a bar that would go from center to one direction only. Although on the surface this seems to make sense, in your demonstrated case here, you would have a bar (well, NO bar in this case!) indicating center of tolerance making it appear to be a perfect part. Yet, moving 0.000000001 positive would jump from what looks like a perfect part to out of tolerance. Yet, going the other way you would have to go the full -0.02 to get to the out of tolerance the other way.

The purpose of the graphic is to show how close you are to your limits. And you are right at the edge of being out!

jswope
Super User
Super User
Posts: 185
Joined: Fri May 17, 2013 12:50 pm

Re: User defined dimension

Post by jswope » Fri Jun 19, 2020 8:19 am

When you look at it that way it makes sense. It is just hard to enplane to the customer that when the actual is the same as nominal that the graft looks like it is almost out.

Post Reply