How to report Profile of a Sphere crossed by a Hole

O

Omar Vazquez

#1
I need some help in how to report profile of a sphere, sphere is crossed by a hole with the axis of the hole as datum A and same center as the sphere, radius of sphere is 4.5, profile is .003 and datum A
 
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Stijloor

Staff member
Super Moderator
#2
Re: Sphere profile

I need some help in how to report profile of a sphere, sphere is crossed by a hole with the axis of the hole as datum A and same center as the sphere, radius of sphere is 4.5, profile is .003 and datum A
Welcome to The Cove Forums! :bigwave: :bigwave:

Any drawing or a sketch you can share?

What's the call out? Profile of a Line? Profile of a Surface?

4.5 what? Inches, Millimeters? .003?

What Standard? ANSY Y14.5 or ISO?

To help you, it would be helpful to get more information.

The possible responses you may get will otherwise be "best guesses." ;)

Stijloor.
 
Last edited:
O

Omar Vazquez

#3
Re: Sphere profile

It is a sphere so is profile of a surface, inches, ANSY Y14.5, no drawing I don't know how to attach it.
 

Stijloor

Staff member
Super Moderator
#4
Re: Sphere profile

It is a sphere so is profile of a surface, inches, ANSY Y14.5, no drawing I don't know how to attach it.
Well, the default profile tolerance zone for a profile call out is that the .003" zone is equally disposed about true profile. In other words, the variations from true profile can not exceed .0015" above and .0015" below true profile.

For your information: Profile of a line (a 2-D control) and profile of a surface (a 3-D control) can be applied to a variety of features. So the fact that you are measuring a sphere does not necessarily mean that profile of line can not be applied. See the ASME Y.14.5M-1994 Standard for example.

Stijloor.
 
O

Omar Vazquez

#5
Re: Sphere profile

Ok, I'll try to be more specific. My issue is that I am using Calypso to measure the part, if I ask for the profile on the sphere, I need to establish 3 axis x, y and z. The print asks for only 2 axis (the center of the hole) and the radius as basic dimension. The area that I have to check the sphere is not big enough to give me a good result, the CMM gives me a big error ( I mean a too big or too small radius that is going to affect the profile) if a small imperfection is catched in the process of measuring it. If I understand profile as the sum of true position plus form error, I think that I can get a better result and there is where I am stuck because Calypso does not give me a profile with 2 axis only and the radius as basic dimension and it is understandable, but in my case what do I do? .
 

Stijloor

Staff member
Super Moderator
#6
Re: Sphere profile

Ok, I'll try to be more specific. My issue is that I am using Calypso to measure the part, if I ask for the profile on the sphere, I need to stablish 3 axis x, y and z. The print asks for only 2 axis (the center of the hole) and the radius as basic dimension. The area that I have to check the sphere is not big enough to give me a good result, the CMM gives me a big error ( I mean a too big or too small radius that is going to affect the profile) if a small imperfection is catched in the process of measuring it. If I understand profile as the sum of true position plus form error, I think that I can get a better result and there is where I am stuck.
Well, I am a GD&T consultant/trainer, not a CMM/software person.

We have members here who are much more knowledgeable about Calypso software and CMM's.

I hope they will respond.

Stijloor.
 
O

Omar Vazquez

#7
Re: Sphere profile

Good, is it ok to understand profile as I told you, as the sum of true position and error form?
 
O

Omar Vazquez

#9
Re: Sphere profile

Thanks, I need to show this to my process engineer, I hope it helps to make him understand that we need to include location in a profile
 

Stijloor

Staff member
Super Moderator
#10
Re: Sphere profile

Thanks, I need to show this to my process engineer, I hope it helps to make him understand that we need to include location in a profile
Be aware that if profile does not include a datum reference, it controls the shape of the profile only.

Profile (surface and line) is a funny control. It is the only geometric control that can be specified with and without datum references.

Stijloor.
 
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