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Message No. 11901, Started by rorobert on 08/18/03
Can someone explain what the difference is in appying a flatness and a parallel tolerance on a part is? I get the two confused.

I checked out the definition of a "basic dimension", it is not clear to me.
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Follow-up Messages (19)
One common area of confusion within GDT is between parallelism and flatnes...
No. 21915, Posted by pfeinstein on 11/17/12, 13:10 PST.
In answer to question one, yes, you are correct, MAYBE. Let me explain: If...
No. 12135, Posted by rorschach on 09/15/03, 10:12 PST.
I have a few questions for you, they are... (1) If the two co-axial hole...
No. 12133, Posted by toddpig on 09/15/03, 08:29 PST.
I hear ya ... I started out in mechanical drawing -- not even drafting... a...
No. 12124, Posted by rstone on 09/12/03, 10:03 PST.
I got my AAS in 1988, after taking drafting for three years in high school....
No. 12123, Posted by rorschach on 09/12/03, 09:57 PST.
Hip Hip Hoooorayyyyy ------- U go rorschach -- this is too true....
No. 12122, Posted by rstone on 09/12/03, 09:19 PST.
While we are on this subject, I just gotta vent a bit. To all you drafting ...
No. 11941, Posted by rorschach on 08/22/03, 07:01 PST.
if it is only two holes you could simply call out surfaces in each of the X...
No. 11940, Posted by rorschach on 08/22/03, 05:52 PST.
The goal is not to have the bores concentric. The bores lie next to each ot...
No. 11935, Posted by rorobert on 08/21/03, 15:04 PST.
paralell in which plane? therein lies the problem. the axes could be parale...
No. 11934, Posted by rorschach on 08/21/03, 14:02 PST.
Thank you, that was very informative. I will go down and see if I can purch...
No. 11933, Posted by rorobert on 08/21/03, 13:15 PST.
you should also check out efunda's section on GD&T: http://www.efunda.co...
No. 11932, Posted by rorschach on 08/21/03, 12:28 PST.
oops, I forgot to mention in the second example that the callout would be t...
No. 11931, Posted by rorschach on 08/21/03, 12:26 PST.
if the cylinders are concentric (I.D. and O.D.) ideally you would want to u...
No. 11930, Posted by rorschach on 08/21/03, 12:19 PST.
Thank you for your time. I have another GDT question regarding the axis of ...
No. 11929, Posted by rorobert on 08/21/03, 11:47 PST.
Basic dimensions are used to dimension the part. They express the ideal co...
No. 11908, Posted by rolschwarz on 08/19/03, 05:56 PST.
the only error I see in your explanation is the use of "edge". if you repla...
No. 11904, Posted by rorschach on 08/18/03, 14:58 PST.
Flatness means just exactly what it sounds like, no point on the surface is...
No. 11903, Posted by rorschach on 08/18/03, 14:56 PST.
Here is my basic understanding, Flatness refers to the form of a feature...
No. 11902, Posted by billdean on 08/18/03, 14:53 PST.
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