Basic Angle with no given tolerance
Basic Angle with no given tolerance
(OP)
Hi all,
New here looking for a little guidance. I have a print for a small heat shield part and it is a poorly done print really. every Dim. is basic and there is no tolerance of any kind given in the info box. Now being a Roamer user, I have to give a tolerance to comply with reporting requirements. So with all that said. I have 6 separate Angle call outs for holes on the part that are all basic angle Dim. all the angles give a positional location in degrees along an arc which also has a radius call out. the only tolerance control given is an all over profile call out of .100 UOS. There is one other call out but not really sure what they mean by it. "located within .050 either side of basic" which is associated with the hole diameters. well the general consensus is that it should be treated as a TP call out. OK fine. Still need to get a Tolerance in DEGREES to report the angles. So does any one know how to do that? using either the profile or the other so called TP call out? and how do I convert that to a degree tolerance?
Thank you for any help you all can provide.
BanZI29
New here looking for a little guidance. I have a print for a small heat shield part and it is a poorly done print really. every Dim. is basic and there is no tolerance of any kind given in the info box. Now being a Roamer user, I have to give a tolerance to comply with reporting requirements. So with all that said. I have 6 separate Angle call outs for holes on the part that are all basic angle Dim. all the angles give a positional location in degrees along an arc which also has a radius call out. the only tolerance control given is an all over profile call out of .100 UOS. There is one other call out but not really sure what they mean by it. "located within .050 either side of basic" which is associated with the hole diameters. well the general consensus is that it should be treated as a TP call out. OK fine. Still need to get a Tolerance in DEGREES to report the angles. So does any one know how to do that? using either the profile or the other so called TP call out? and how do I convert that to a degree tolerance?
Thank you for any help you all can provide.
BanZI29





RE: Basic Angle with no given tolerance
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RE: Basic Angle with no given tolerance
That's a management problem, not a GD&T problem.
Mike Halloran
Pembroke Pines, FL, USA
RE: Basic Angle with no given tolerance
While it's hard to imagine it's the most appropriate way to tolerance the features, the all over surface profile isn't necessarily inherently wrong.
The basic dimensions give the theoretically perfect location of the surfaces.
The profile tolerance explains how far from that theoretically perfect location the surface can deviate.
The other call out appears to be clarifying that it's an equal bilateral application of the surface profile tolerance.
So, there is not an explicit tolerance on the angles - the same would be true if it was using more conventional position control for the holes.
If you repost I suggest explicitly stating what standard (and what version of standard) you are working to, e.g. ASME Y14.5M-1994
http://www.tec-ease.com/gdt-tips-view.php?q=197
http://www.tec-ease.com/gdt-tips-view.php?q=263
http://www.tec-ease.com/gdt-tips-view.php?q=163
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Basic Angle with no given tolerance