Hole Patterns with Same datums 1

[DanieJones]

Say you have a hole pattern of 2x dia .25 holes depth .5 held with a position of dia .010 to datums A, B and C and another hole pattern of 2x dia .25 holes depth .75 with a position of dia .010 to datums A, B, and C on the same surface.

Does the fact that the two hole patterns are called out to the same datums mean the pattern of the four holes will be held to eachother within .010?

Any reference to the standard would be helpful.

 

[CheckerHater]

Technically, they will form one single pattern held within DIA.010 to A, B, and C.

You can go around this by adding "SEPARATE REQUIREMENT" note.

 

[CheckerHater]

Sorry,

ASME Y14.5-2009 Para 4.19

 

[fsincox]

The simultaneous requirement goes back through many of the ASME versions.
Frank

 

[powerhound]

I'm not sure about the direct answer to your question about whether they should be held to each other within .010, but they do have to meet their requirement with respect to the datum reference frame at the same time. I'm inclined to say the answer to your question is yes.

In the 1994 standard the paragraphs to reference are 5.3.6.1 and 5.3.6.2.

Powerhound, GDTP T-0419
Engineering Technician
Inventor 2010
Mastercam X5
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SSG, U.S. Army
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[fsincox]

The direct answer is yes.
Frank