repeat datums multi sheet drawings
repeat datums multi sheet drawings
(OP)
Guys,
On a multi-sheet drawing of a comlex machined part I want to specify some of the datums on more than one sheet so that the manufacturer is not continually flicking thru sheets looking for them.
I am not sure if that is regarded as dual-dimensioning, I cannot find anything in ISO 5459 or 1101 about it. For a datum, is it allowed to repeat the declaration? Or should I declare it once, and then on subsequent sheets write 'ref' after the datum symbol?
How do others do this, and which standard governs that practise?
Thanks
Dave
On a multi-sheet drawing of a comlex machined part I want to specify some of the datums on more than one sheet so that the manufacturer is not continually flicking thru sheets looking for them.
I am not sure if that is regarded as dual-dimensioning, I cannot find anything in ISO 5459 or 1101 about it. For a datum, is it allowed to repeat the declaration? Or should I declare it once, and then on subsequent sheets write 'ref' after the datum symbol?
How do others do this, and which standard governs that practise?
Thanks
Dave





RE: repeat datums multi sheet drawings
I am not sure how ISO standards deal with this but in ASME Y14.5-2009 standard in section 3.3.2 (page 38) you can find following note:
"Where the same datum feature symbol is repeated to identify the same feature in other locations of a drawing, it needs to be identified as reference."
I think this can also apply to a multi-sheet drawings case.
RE: repeat datums multi sheet drawings
"Where the same datum feature symbol is repeated to identify the same feature in other locations of a drawing, it need not be identified as reference."
RE: repeat datums multi sheet drawings
RE: repeat datums multi sheet drawings
RE: repeat datums multi sheet drawings
We also used to do this in the UK to ISO based standards though I can't claim to remember a reference to justify it.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: repeat datums multi sheet drawings
"Good to know you got shoes to wear when you find the floor." - Robert Hunter
RE: repeat datums multi sheet drawings
Peter Stockhausen
Senior Design Analyst (Checker)
Infotech Aerospace Services
www.infotechpr.net
RE: repeat datums multi sheet drawings
RE: repeat datums multi sheet drawings
RE: repeat datums multi sheet drawings
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: repeat datums multi sheet drawings
Matt Lorono
Lorono's SolidWorks Resources & SolidWorks Legion
&
RE: repeat datums multi sheet drawings
Do you follow the new 2009 convention X[A,B,C]? We have not adapted this yet as it will clutter the drawing some fierce.
Adding a datum with (ref) seems to me make the most sense as you are not defining that the feature in that view only saying "Hey this dimension starts from datum x". This is clearly against the standard however, bummer...
RE: repeat datums multi sheet drawings
"Good to know you got shoes to wear when you find the floor." - Robert Hunter
RE: repeat datums multi sheet drawings
Jim Sykes, P.Eng, GDTP-S
Profile Services www.profileservices.ca
TecEase, Inc. www.tec-ease.com