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Basic dimension question

Basic dimension question

Basic dimension question

(OP)
Hi All:

A simple question of basic dimension, when we calculate the position we need to measure the actual dimension 2X .185 as shown on the attached print, it's a true position of the feature (although I know there is a basic angle 2X 50°), shall we change it to basic dimension?

Thanks  for your inputs

SeasonLee
 

RE: Basic dimension question

Which standard are you working to, ASME or ISO? If ASME, then your position callout is at least suspect. I think you want to control location of small two flat portions of the bottom feature and not something which is in a middle of .185 distance.

My proposal would be to switch .185 to basic, show 2 of them on both sides of the part and apply two separate profile of surface callouts to both flat surfaces.

RE: Basic dimension question

I am with pmarc, I would use profile and move the leader to the surface, if referencing ASME. Even if using ISO, I would move the position leader to the surface of the tab, as for the for mentioned profile tolerance.
Frank
 

RE: Basic dimension question

(OP)
Thanks for your comments, pmarc.

The print is per ASME standard, I agree surface profile control is better than position.

SeasonLee

RE: Basic dimension question

1) No there is no basic dinension to establish the TP of the centerplane from datum "A"(illegal).
2) If you intend to locate the centerplane the dimension should relfect that intent (bad form).
Frank

RE: Basic dimension question

SeasonLee,
Didn't you post this sketch or similar some time ago here and the same question was already answered?

RE: Basic dimension question

(OP)
You are right, pmarc. this sketch posted at 3-20-12, how come I forgot it in a short time, sorry about that.

SeasonLee

RE: Basic dimension question

Yesterday, I got a different picture than this one.
Frank

RE: Basic dimension question

(OP)

Frank
The sketch posted yesterday is same as what I posted at 3-20-12, sorry for any inconvenience caused.
http://www.eng-tips.com/viewthread.cfm?qid=318331

SeasonLee

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