Standard Hole Feature Tolerances
Standard Hole Feature Tolerances
(OP)
Hi,
I was wondering if anybody could help me with a query. A number of years ago I worked within the aerospace manufacturing industry and remember that our drawings had a spec/standard in the title block that when reviewed told you general tolerances for linear dimensions and hole features (drilled holes, tapped holes, rivet holes etc) this was used if a tolerance was not specified on the actual drawing. Problem I have is that a customer is using ASME Y14.5 and is using trailing digits to specify a tolerance. Problem with this is that when drawings have been updated to CAD drawings a simple 3/8" thread depth now becomes 0.375" is subject to 3 decimal places tolerance which is +/-0.005". Is there something within ASME that does what I can remember from aerospace?
Thanks
I was wondering if anybody could help me with a query. A number of years ago I worked within the aerospace manufacturing industry and remember that our drawings had a spec/standard in the title block that when reviewed told you general tolerances for linear dimensions and hole features (drilled holes, tapped holes, rivet holes etc) this was used if a tolerance was not specified on the actual drawing. Problem I have is that a customer is using ASME Y14.5 and is using trailing digits to specify a tolerance. Problem with this is that when drawings have been updated to CAD drawings a simple 3/8" thread depth now becomes 0.375" is subject to 3 decimal places tolerance which is +/-0.005". Is there something within ASME that does what I can remember from aerospace?
Thanks





RE: Standard Hole Feature Tolerances
If your customers don't reference some other spec and just have the typical "unless other wise stated .xxx = +-.005" block tolerance then that is what applies.
When they updated the drawing they should probably have directly toleranced such features to ".375 +-.030" or whatever was implied by fractional values on old drawing.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Standard Hole Feature Tolerances
If the thread depth is specified as .375", and the titleblock tolerance is &pn;.005", then the tolerance is ±.005". You can always call and ask if they really mean it!
The problem with both English and metric drawings is that lazy drafters do not review all the dimensions for tolerances.
--
JHG
RE: Standard Hole Feature Tolerances
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RE: Standard Hole Feature Tolerances
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RE: Standard Hole Feature Tolerances
Chris, CSWA
SolidWorks '15
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RE: Standard Hole Feature Tolerances
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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.