How to report Profile of a Sphere crossed by a Hole

O

Omar Vazquez

#11
Re: Sphere profile

Thanks, I hope this helps to make my process engineer to understand that we need to include location to calculate profile.
Does somebody can help me with Calypso please?
 
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O

Omar Vazquez

#13
Re: Sphere profile

So, it can be defined with 2 axis and a basic dimension like the radius of the sphere in this case right?
 

Stijloor

Staff member
Super Moderator
#14
Re: Sphere profile

So, it can be defined with 2 axis and a basic dimension like the radius of the sphere in this case right?
What I have seen on drawings of spheres is that the radius is a basic dimension originating from the center point of the sphere. The spherical center point is the intersection of the three axes X-Y-Z.

This is the geometric definition, I can not advise you on how calypso software sets this up.

Stijloor.
 
O

Omar Vazquez

#15
Re: Sphere profile

Lets go by the print only, if my hole is at the Z axis, the hole is my datum A, I have defined 2 axis only x and y for my location and my radius as basic dimension. That means to me that my z axis is floating and my profile is defined in form by the radius only but ruled in positions x and y by my datum A that is the hole right?
 

Stijloor

Staff member
Super Moderator
#16
Re: Sphere profile

Lets go by the print only, if my hole is at the Z axis, the hole is my datum A, I have defined 2 axis only x and y for my location and my radius as basic dimension. That means to me that my z axis is floating and my profile is defined in form by the radius only but ruled in positions x and y by my datum A that is the hole right?
You may want to give that a try.

Stijloor.
 
O

Omar Vazquez

#17
Re: Sphere profile

I did, I started this post to make sure that I was doing the right think and to verify that I understood well what the print was asking, thank you again. What I need to know yet is how to get the result directly from Calypso, I hope somebody can help,
 
S

Sturmkind

#18
Omar;

Zeiss helps user support groups globally at http://www.zeiss.ca/__4125682000247...7f84ef01568525698b0060d66c?OpenDocument&Click=.

Zeiss also has a portal at http://www.conceptmachine.com/zeiss.html that may help. If the hole is not exactly coincident with the true center of the sphere then I believe that the error of the datum will be translated as radial error.

Such a condition could be explored more efficiently with a roundness measurement device (like a Talyrond). I am not associated with any of the companies and wish you success in resolution of this problem.
 

Stijloor

Staff member
Super Moderator
#19
<snip>If the hole is not exactly coincident with the true center of the sphere then I believe that the error of the datum will be translated as radial error.
This profile callout refers to the hole as a datum feature. In this case, profile (in addition to form/shape) also controls the location as well as the size of the sphere. Any location error can not exceed the stated profile tolerance.

Stijloor.
 
T

True Position

#20
I do have some experience with Calypso so maybe I can help.

Let me see if I understand your problem, you have a sphere with a cylinder running through it, the cylinder is your primary datum with the center of the cylinder as the center of the sphere as well.

Assuming you are setting this up the easy way (with the center bore being aligned to +Z) and just scanning circles on the sphere and probably a helix for the ID cylinder I would use the cylinder for the alignment and as the X and Y origin, using the sphere itself as the Z origin. Since the object will obviously be true to itself in Z it's effect in position error is will be zero.

You are correct that the profile tolerance is effectively form + position error. (Runout functions in the same way.)

CMM's are bad at reporting profile. You'll have more luck simply outputting diameter, form error of the sphere, and position error of the larger sphere to the center diameter.
 
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