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tolerance for patterned holes

tolerance for patterned holes

tolerance for patterned holes

(OP)
hi all,

I'm designing a part that has 20 holes in it in a 15 mm distance from the datum A (see in attached picture) , whats important to me is that all the holes centers will be on the same plane within 0.01mm , i dont want to place a +-0.01mm tolerance on the 15 dimension because its not important , the holes can be even 16 or 14 mm away from the base but whats important is that the centers will be on the same plane , what is the correct way to write that on the drawing?

thanks

RE: tolerance for patterned holes

idanbrk,

Select two holes, and make them your secondary datum B and tertiary datum C. Put a sloppy profile all around your 210x30mm outline.

--
JHG

RE: tolerance for patterned holes

I would use a width datum as the primary datum.

Tunalover

RE: tolerance for patterned holes

Composite, the way Vishal described it

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

RE: tolerance for patterned holes

(OP)
thanks everyone , you have been very helpful

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