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Multiple secondary target points

Multiple secondary target points

(OP)
When using datum targets on a flexible part with a complex shape, there is no limit to the number of primary target points. Can the secondary have more than two target points?

RE: Multiple secondary target points

If it makes sense to use multiple directions of restraint then there is no need to limit the number of them.

RE: Multiple secondary target points

From Y14.5-2009, para. 4.20:
"In a restrained application, it is permissible to use as many datum targets as necessary to establish the datum features."

RE: Multiple secondary target points

Even in an unrestrained condition, it would be permissible to use more than the usual number of targets. The part may not contact all of them (which is why restraining is often advisable) but maybe full contact isn't needed.

Also, there are instances of a secondary datum needing less than two points of contact -- only one point.

John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems

RE: Multiple secondary target points

(OP)
Thanks to all for the responses. It clarifies doubts I had.

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