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Set Datums (3596 read)
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scott
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since: May 01, 2001
1. Set Datums
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In your book "FUNDAMENTALS OF GEOMETRIC DIMENSIONING
AND TOLERANCING". On page 146 figure 6-1 you show the
ways to specify a axis as a set datum. On my drawings
created using PTC's Pro/Engineer software I would prefer
to use either option B or C for showing a set datum as a hole axis.
But Pro/Engineers software tells me that I can only use
option A. It then refers me to the ASME Y14.5M-1994
standard page 43 figure 3-4. In this figure I do not see
any options that look the same as B and C in your book.
Witch list of options is correct?
Date: May 01, 2001 on 12:27 p.m.
RoyCross
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since: Nov 05, 2001
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Scott,

The ASME Y-14.5M-1994 std does allow option B or C shown on page 146 fig 6-1 in Alex's textbook even though it does not show these options in figure 3-4 of the standard. These options are stated in section 3.3.2 paragraphs d and f, found on page 41 of the standard.

Good Luck!

Roy Cross
Date: Mar 01, 2003 on 09:42 a.m.
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This archive of the original ETI message board is read only, so comments and/or replies to these threads cannot be posted. The archive will continue to be available online as a valuable GD&T resource. If you'd like to continue a discussion of any of these topics, create a new post on the board here.

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