ANSI Y14.5
ANSI Y14.5
(OP)
I know this may be a basic question but I have one of our designers using a parallel w/in .005 to control a basic dimension of 1.500. My understanding is if he wanted to use a control that covered both parallel and height that a profile tolerance should be used.
I looked in the book and it shows a tolerance zone for parralel but never in relation to a basic dimension.
Hope this question is clear enough that someone can help me with this...
Thanks
I looked in the book and it shows a tolerance zone for parralel but never in relation to a basic dimension.
Hope this question is clear enough that someone can help me with this...
Thanks





RE: ANSI Y14.5
RE: ANSI Y14.5
RE: ANSI Y14.5
RE: ANSI Y14.5
GD&T Tips website - Parallelism
GD&T Tips website - Composite Profile
Giuseppe Sagolla
Sr. Mechanical Engineer
Ocean Power Technologies
RE: ANSI Y14.5
case closed
Cheers
RE: ANSI Y14.5
Tip - Reflecting the surface with profile of a surface is best since it does control the location of the surface, parallelism and also flatness. If you have a profile of a surface tolerance of 0.5 mm from a basic dimension. The 0.5 is the range of a bilateral tolerance. Nother can be above or below this value.
Basic dimensions are theoretical dimensions and are not tolernaced.
RE: ANSI Y14.5
The thing that is necessary is that we control the position of the surface, as well as its parallelism. Your +/- tolerance achieves this, as does the profile tolerance recommended by caseynick, above.
I can also do a composite tolerance in which the profile tolerance is 1mm, and the parallel tolerance is 0.05mm for example. I do this a lot on optical mirror mounts, where the position does not matter much, but the angle is absolutely critical.
JHG
RE: ANSI Y14.5
The links from gsagolla helped a lot
Thanks again