Question on controlling form and position of irregular features

[Tunalover]

Section 8.8 and Figure 8.24 of ASME Y14.5-2009 discusses the control of form and position of irregular features. Figure 8-24 shows an example where the profile tolerance is larger than the positional tolerance. Is it a necessary condition that the profile tolerance be larger than the position tolerance? Can the position tolerance be larger than the profile tolerance in a similar example?
TIA for your inputs.




Tunalover

 

[pmarc]

Short answer - yes, the position tolerance can be larger than the profile tolerance.

 

[CheckerHater]

Cannot see why not - imagine that you use profile to control the size of (round) hole. Your hole size tolerance may be larger or smaller that position tolerance - there is no refinement.

"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future

 

[Tunalover]

Thanks guys!


Tunalover