Datum needed?
Datum needed?
(OP)
Please take a look at the attached image.
Do the hole centerlines imply that the outer edges are square with the hole pattern? Or do I need a clocking datum (one of the widths) to line everything up correctly?
Thanks!





RE: Datum needed?
Also, (sorry if this is just a sketch and I'm thinking too much) the 6.00 & 10.00 should somehow be tied to datum B. Otherwise allthough shown 'centered' there's no explicit tolerance on how well centered.
KENAT,
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RE: Datum needed?
RE: Datum needed?
If you are using the two small holes as datum B, then you don't need the tertiary datum.
SeasonLee
RE: Datum needed?
RE: Datum needed?
BTW, the hole callout for {"dia".250 THRU} should read {2X "dia".250 THRU}. Other then that, please feel free to comment.
V/R
Nathan
CAD Technician/ISO Director
Compass Systems, Inc. ( http://www.compass-sys-inc.com/ )
RE: Datum needed?
I'll assume block tols cover the overal dims. Also you have an issue with your decimal places not matching between basic dimension and FCF assuming your drawing is inches per 2.3.2 of ASME Y14.5M-1994.
KENAT,
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What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Datum needed?
2. Again, the basic dimension should be three decimal places to match with the positional tolerance.
SeasonLee
RE: Datum needed?
Your comments are dully noted. As for the FCF decimal places, I ment to make them 2 place. I blam that mistack on my use of quick sketing and fat-fingering the FCF's. They should read {"dia".05}.
Also let me say, that you two would defenatly be great brains to pick for a month strait. Unfortanatly that would be impossible.
V/R
Nathan
CAD Technician/ISO Director
Compass Systems, Inc. ( http://www.compass-sys-inc.com/ )
RE: Datum needed?
As for your compliment, thanks, but trust me, there are much better than I that frequent this place. I just try and answer the ones within my limits so I can get help when I need it on more complex stuff. There aint enough to spend a month picking!
KENAT,
Have you reminded yourself of FAQ731-376: Eng-Tips.com Forum Policies recently, or taken a look at posting policies: http://eng-tips.com/market.cfm?
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?