Same dimension value, different feature
Same dimension value, different feature
(OP)
I am familiar with using the notation 2X <dim> when features are repeated. How do you dimension a part which has two different features with the same value such as in the picture? This is a section view of a round part. I am trying to decide how to make it clear that both the Ø2.750 and the Ø2.562 are to be 29/32" long.





RE: Same dimension value, different feature
SeasonLee
RE: Same dimension value, different feature
RE: Same dimension value, different feature
Jim Sykes, P.Eng, GDTP-S
Profile Services www.profileservices.ca
TecEase, Inc. www.tec-ease.com
RE: Same dimension value, different feature
On similar drawings, I have applied a 2X to your 29/32 dimension. This makes it clear it applies to two features.
Another way would be to have a separate dimension in the middle of the view, showing the depth of the hole. On drawings like this, I like to do half sections. I dimension the external features on the non-section side, and the internal features on the other.
RE: Same dimension value, different feature
If one does not have to be controlled differently then I would put a "2X" on the one dimension.
HTH,
Dan
Han primo incensus
RE: Same dimension value, different feature
RE: Same dimension value, different feature
2X would work for me, or separately specifying the bore depth with it's size callout.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Same dimension value, different feature
Out of curiosity - is there going to be any GD&T applied to this part?
RE: Same dimension value, different feature
RE: Same dimension value, different feature
I perfectly understand all the stuff that I do. The critical question is does everyone else understand what I am doing?
Good drafting is like good writing. You make things clear. A separate dimension on each feature is absolutely clear. A 2X on the dimension of the first feature that appears to be lined up on the first one is pretty clear. Make sure the two features are forced to line up on your CAD model.
A single dimension on one of the two aligned features can be interpreted as per ASME Y14.5, but you are pushing your luck.
RE: Same dimension value, different feature
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Same dimension value, different feature
RE: Same dimension value, different feature
Standards are merely rules of the game, but when you ask to help with your game, while you are not playing by the rules, it may create slight misunderstanding.
RE: Same dimension value, different feature
Be careful, you just stepped into the realm where most of people worship the only true faith called Unambiguity. Whenever CheckerHater calls somebody "Dear...", you may be sure that the person is walking on thin ice and that the cardinal sin is being committed
RE: Same dimension value, different feature
we used "(2)" for this situation and "2X" for the conditions shown in the standard. I know some may see this as splitting fine hairs. In my opinion, reference is just that, whatever you need it for. "2X" is specifically defined by the standard as and when and how to use it. Plus it was what we did, forever.
Frank