PLEASE HELP...TOLERANCE NOTES IN DRAWINGS

[imagineers]

Ok, so I have not made a drawing template in years, I am having a little trouble setting up the tolerance notes. I think in the past I have used separate note block depending on the proces used i.e. injection mold, sheet metal, cast, machining etc. Is this common practice?? Also , for each one of these what would be a good starting point to show on the drawing notes. should I show 0.x, 0.xx and 0.xxx to three decimal places or just two? What would be good tolerances to start with on these. I have attached a screenshot of the notes for each one I was thinking, let me know what you think. Also is there an ASME standard or something people can look at to make templates like this? Thanks

 

[ctopher]

Looks good. make sure those tolerances work for your company.
If the tol are the same for mah/sm/cast/inj mold, you only need one block on the template.
I would add "UNLESS OTHERWISE SPECIFIED", and a degree symbol after the angle tol.

Chris, CSWA
SolidWorks 14
SolidWorks Legion

 

[dgallup]

Why do you have a smaller tolerance for one decimal place than for two decimal places? The angular tolerance is awfully small for a default, I usually use 2 degrees.

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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.

 

[CheckerHater]

Also is there an ASME standard or something people can look at to make templates like this?

Search Google for ANSI B4.3

I could provide a link, but it would be illegal.

 

[imagineers]

thanks guys, I think I will just use a standard 0.2, 0.10, and 0.5 for angle and then add tighter or looser tolerance on the drawing as per usual.

 

[tbuelna]

It is common practice to use model-based definition for tolerancing components like castings, injection molded parts, composite structures, etc. You would use a drawing note that says something like "part shape is defined by digital CAD model XXXXX", "surfaces are within +/-.030" profile tolerance", etc.

 

[juergenwt]

It is all set up and ready to go:

http://www.marylandmetrics.com/tech/DINISO1302extract.htm

Also here:

http://www.marylandmetrics.com/tech/DINISO1302extract.htm

Lots of info here:

http://www.engineersedge.com/mechanical,045tolerances/general_iso_tolerance_.htm

 

[KENAT]

Erm, depending what drawings standards you are working to the number of decimal places corresponding to a certain tolerance may not work well with mm since some standards (ASME Y14.5M-1994 1.6.1c for example) don't use trailing zeros on metric dimensions.

Of course you could make an exception to this as long as it is clearly communicated/stated somewhere so all drawing users will know.

Posting guidelines faq731-376

http://eng-tips.com/market.cfm?

(probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​

 

[imagineers]

thanks guys