Drawing critique / GD&T novice
Drawing critique / GD&T novice
(OP)
My GD&T is not to hot as learning! See drawing attached of a simple pre machined casting. Please add comment on my Datum choices and tolerance features - do they make sense? any comments are welcomed. Thanks





RE: Drawing critique / GD&T novice
Also, datum feature choices will depend on function, so if you can perhaps give some information on that, even mark up the print, it will help responses.
Finally if it's not on your drawing please state what standard you are working to, ASME Y14.5M-1994 or another?
KENAT,
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RE: Drawing critique / GD&T novice
Standard is to ASM Y14.5M-1999.
The part is a cast inlet cone for a light vehicle exhaust system.
Important features are oval outlet, round inlet and 3x protrusions.
I'm not to sure how tightly toleranced the part should be yet.
Again I am new to GD&T and one of my questions would be is it ok to use the oval as a Datum?
Thanks
RE: Drawing critique / GD&T novice
Peter Stockhausen
Senior Design Analyst (Checker)
Infotech Aerospace Services
RE: Drawing critique / GD&T novice
Peter Stockhausen
Senior Design Analyst (Checker)
Infotech Aerospace Services
RE: Drawing critique / GD&T novice
Will look into the horizontal text and I think I will also denote datum B in a side view for clarity. Datum A,B & C are not removed by machining but datum D is. To get a datum plane similar to D is it legit to use the oval CL instead?
RE: Drawing critique / GD&T novice
You can't use the CL but I'm guessing you can use the width or length and get broadly equivalent.
Your datum features have to be actual features, where applicable a CL can be derived from these features. Take a look at Figure 4-13 in the standard and related text to try & understand what I mean.
KENAT,
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RE: Drawing critique / GD&T novice