How to report Profile of a Sphere crossed by a Hole

[falconer65]

First, for Calypso Specific questions I would suggest the Zeiss forum.

https://extranet.zeiss.de/C1256FD30034D078

The site also has training material.

I do not know your details so I will start at the beginning. Please forgive if I overstep.

So in general, I assume this is in inches. What process is used to form the SR 4.5? Different processes have different challenges when measured.

I am seeing two issues. One is measuring, the other is reporting. These methods will apply to any CMM.

1.What features are you using to find the part/set the alignment?
2.Are you iterating your alignment? How tight?
3.If you can, take thousands of points and use outlier and filter functions.
4.Look at the vectors for your points, are they close to perpendicular to the surface?
5.Loop the same part 10 times and compare the results for range and then divide the range by the tolerance to find out how repeatable it is. I aim for under 5%, but live with 10% if I have to.

Once you have it measured consistently it is down to reporting, and that can be up to the customer. I have some that want what is on the print and only the print. That is what i would suggest. The details are for troubleshooting if it measures out of specification. I would collect the details, as much as possible, so I would not have to re-measure the parts, just keep them for internal use unless the customer asks for them.

Erik

[Omar Vazquez]

In Reply to Parent Post by True Position

Wow, that's terrible to measure. Luckily with the B datum being the spherical surface the concerns related to Z aren't too bad.

If you are going to setup the part with the A datum (I'm assuming it's the axis the bore) along +Z, set your spatial rotation to that cylinder, X and Y origins also to that cylinder. Create a 4.5 inch sphere feature for datum B, use it for your Z origin.

For your profile, it's the form error of the sphere, the position error of B to A, and the diameter error of the sphere from 4.5.

Theoretically the profile could be better then that, but it can't be worse.

That's going to be a difficult tolerance to hold in almost any machining process since you need a nearly perfect sphere, on position, to the right diameter.

You are right about the difficulty, so I went to the right direction. Parts are already verified, I only needed to be sure that I did the right way.

[Omar Vazquez]

Thank you for the info, I asume that iteration and how to use loops and outlier will be at that site you gave me, right?

[True Position]

In Reply to Parent Post by Omar Vazquez

Thank you for the info, I asume that iteration and how to use loops and outlier will be at that site you gave me, right?

There are some good presentations on the Zeiss forums for those topics. Also, they are covered during the advanced training class.

[Omar Vazquez]

In Reply to Parent Post by True Position

Also, they are covered during the advanced training class.

I wish to have that, my employer does not like to expend in that kind of commodities

[True Position]

In Reply to Parent Post by Omar Vazquez

I wish to have that, my employer does not like to expend in that kind of commodities

Well, get access to the 'Carl Zeiss Metrology Portal' and there's plenty of good powerpoint presentations on different topics. Zeiss's phone support (assuming your contract is up to date) is quite good as well.

[Stijloor]

In Reply to Parent Post by Omar Vazquez

I wish to have that, my employer does not like to expend in that kind of commodities

If your employer views good training as a commodity, then your employer has a very serious problem. I don't want to pound the Cove's chest, but where else could you have gone to get some help with your measurement problem? Wish you good luck. I'm glad that the Members here have been able to help you.

Stijloor, Forum Moderator.

[Omar Vazquez]

In Reply to Parent Post by Stijloor

If your employer views good training as a commodity, then your employer has a very serious problem. I don't want to pound the Cove's chest, but where else could you have gone to get some help with your measurement problem? Wish you good luck. I'm glad that the Members here have been able to help you.

Stijloor, Forum Moderator.

I know, my responsibility as member of the Quality community, the ethics involved and the hunger of knowledge makes me look for answers, in the end I am the beneficiary, it makes me grow as a human been. If my employer does not want to invest in knowledge, he will regret it later, I know that I made my part.
Thank you all for the help.

Knowledge is every body's property, you only need to look for it