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Index / Geometric Dimensioning and Tolerancing (GD&T) / ASME Y14.5M
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clocking question (1527 read)
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casey
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1. clocking question
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A drawing shows a cylinder with a flange on each end. There is a 8 hole bolt hole pattern in each flange. The o.d. of the cylinder is datum A. The flange face at one end is datum B. The flange face at the other end is datum C. The holes at the datum B end have a positional control to B/A and the holes at the datum C end have a positional control to C/A. The holes are shown in line. Does the drawing require them to be in line?
Date: Nov 01, 2006 on 07:23 a.m.
dream_weaver
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2. Re:clocking question
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last updated at Nov 01, 2006 01:27 p.m. (1 times)
The described tolerancing does not declare them to be necessarily aligned.
Date: Nov 01, 2006 on 01:09 p.m.
ASME-MAN
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3. Re:clocking question
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Casey,
What relationship is there between the 16 holes (8 at each end)? As described there is none. So Dream Weaver is correct to state that they are not required to be alligned or even Parallel to each other.
This could be accomplished several ways:

Make the 8 holes at one end a pattern of datum features and relate the other 8 holes to the first set of 8.

Specify that thier are 8 thru holes (thru) indicates the features (holes) pass all the way through the part.

Identify another feature as a datum featuer for the purpose of clocking the 2 sets of holes to the same alignment.

The GM addendum to the ASME Y14.5M-1994 standard identifies the concept of an interupted feature. If your company standards allow it, you might consider identifiying the 16 holes as 8 interupted diameters.

Good luck,

Thank You for Remembering ETI,
Michael Adcock
ETI Instructor
Date: Nov 06, 2006 on 11:23 a.m.
casey
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4. Re:clocking question
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As the drawing stands is there absolutely no relationship between the two sets of holes at all? Or would the relationship be indirectly controlled by 2.1.1.2?
Date: Nov 06, 2006 on 12:55 p.m.
Dave
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5. Re:clocking question
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No control at all.

Dave S.
Date: Nov 07, 2006 on 12:04 a.m.
clocking question
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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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