Perpendicularity of an axis to an axis.
Perpendicularity of an axis to an axis.
(OP)
Hey everyone,
I'm having a conceptual problem with some language in the new 2009 standard regarding perpendicularity. The 1994 standard stated that a perpendicular tolerance zone can specify "a cylindrical tolerance zone perpendicular to a datum plane within which the axis of the considered feature must lie" (6.6.4.1). No problems there. In the 2009 standard, in addition to being perpendicular to a datum plane, it can also be perpendicular to a datum axis (6.4.2).
My logic tells me that calling out a perpendicularity tolerance of a hole to a datum axis (think of a radial hole in a cylindrical shaft) would drive the location of that hole to lie on the datum axis. Is this correct? Although I understand that orientation tolerances don't control location, in this case it seems unavoidable. Theoretically, it doesn't seems like two axes would be perpendicular without also being coplaner.
I'm interested to hear your thoughts.
Mike
I'm having a conceptual problem with some language in the new 2009 standard regarding perpendicularity. The 1994 standard stated that a perpendicular tolerance zone can specify "a cylindrical tolerance zone perpendicular to a datum plane within which the axis of the considered feature must lie" (6.6.4.1). No problems there. In the 2009 standard, in addition to being perpendicular to a datum plane, it can also be perpendicular to a datum axis (6.4.2).
My logic tells me that calling out a perpendicularity tolerance of a hole to a datum axis (think of a radial hole in a cylindrical shaft) would drive the location of that hole to lie on the datum axis. Is this correct? Although I understand that orientation tolerances don't control location, in this case it seems unavoidable. Theoretically, it doesn't seems like two axes would be perpendicular without also being coplaner.
I'm interested to hear your thoughts.
Mike





RE: Perpendicularity of an axis to an axis.
Now “look “in direction of that line.
You will see axes being either perpendicular or not.
I could be wrong, but I think ISO used to have special symbol for that.
RE: Perpendicularity of an axis to an axis.
RE: Perpendicularity of an axis to an axis.
I am trying to find some meaningful illustration, but without much luck.
I looked thru my copy of 14.5-2009 and I am not very happy with examples they provided.
Looks like 14.5.1M-1994 limits itself to 2 axes in the same plane.
If you have any particular part in mind, maybe some solution can be found that will make you comfortable.
RE: Perpendicularity of an axis to an axis.
I do disagree though that non-coplaner lines can be perpendicular in the true sense of the definition. I think the better definition would be skew lines. However, if that's the intent of the standard, so be it!
Thanks.
RE: Perpendicularity of an axis to an axis.
Two axes may be perpendicular to each other but do not have to cross each other. See attached graphic.
http://files.engineering.com/getfile.aspx?folder=6...
RE: Perpendicularity of an axis to an axis.
Do you have access to a copy of ASME Y14.5.1M-1994?
Half of the book is dedicated to describing all possible cases of angularity/perpendicularity/parallelism.
You may not find direct answer to your question there, but it will definitely broaden your horizons
RE: Perpendicularity of an axis to an axis.
RE: Perpendicularity of an axis to an axis.
RE: Perpendicularity of an axis to an axis.