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Primary datum as a sphere?

Primary datum as a sphere?

Primary datum as a sphere?

(OP)
Imagine the a tie rod end.
The sphere component has a shaft protrusion.
For functionality in the assembly, the sphere is the primary datum.

If I called out the diameter of the sphere as the datum would be it be a center point? Or a set of perpendicular planes?

RE: Primary datum as a sphere?

(OP)
I have a sketch showing what I want.
Not sure how I post it.

RE: Primary datum as a sphere?

Perhaps you could use the protrusion as a datum feature, A, and the dia of the sphere as B.  Then you could make ref to axis A-B.



RE: Primary datum as a sphere?

(OP)
I could do that...  but in the application the sphere is clamped and completely constrained. Except for rotation.

RE: Primary datum as a sphere?

Specifying a sphere as a Datum Feature of Size gives you a point in the center (vs the axis of a cylindrical feature of size), which has three mutually perpendicular planes centered at that point (there are two mutually perpendicular planes associated with the axis of a cylindrical feature of size).  The planes are the datum planes from which measurements are taken.

Jim Sykes, P.Eng, GDTP-S
Profile Services
CAD-Documentation-GD&T-Product Development
www.profileservices.ca

RE: Primary datum as a sphere?

(OP)
But this center point of the sphere defines how the remaining geometry is created.
I understand it is not a plane, but it is the most important location for assembly reasons.

RE: Primary datum as a sphere?

How Can I Show An Image In A Post
FAQ559-1100

Chris
SolidWorks 06 5.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 10-27-06)

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