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3 holes - position - datum

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Posted by Fabrice Galasse (62.235.20.22) on January 12, 2003 at 05:50:47:

Hi,

I have to define the position of 3 holes on a fixation plate.
I take the plane of the plate as datum A (with a planeity tolerance). The first hole is defined as datum B with a 0.1 perpendicularity versus A. Then I define the second hole with basic dimension from first hole and with a 0.1 perpendicularity versus A. Then the third hole is also positionned with basic dimension, with tolerance position 0.1 versus datum A,B,C.

I think that something is missing for the second hole, isn't it? It is seems to me that perpendicularity alone does not define fully the tolerance.

Could you let me know how you would do.

Thank you
Fabrice

Follow Ups:

Re: 3 holes - position - datum John-Paul Belanger 21:32:59 01/12/03 (1)
- Re: Re: 3 holes - position - datum Fabrice 05:03:21 01/13/03 (0)

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Subject: Re: 3 holes - position - datum

Comments:
: Hi, : I have to define the position of 3 holes on a fixation plate. : I take the plane of the plate as datum A (with a planeity tolerance). The first hole is defined as datum B with a 0.1 perpendicularity versus A. Then I define the second hole with basic dimension from first hole and with a 0.1 perpendicularity versus A. Then the third hole is also positionned with basic dimension, with tolerance position 0.1 versus datum A,B,C. : I think that something is missing for the second hole, isn't it? It is seems to me that perpendicularity alone does not define fully the tolerance. : Could you let me know how you would do. : Thank you : Fabrice

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