Indicating allowable taper
Indicating allowable taper
(OP)
I have a part with a cylindrical portion that has to be closely controlled. Within the size tolerance I can allow a small amount on taper in one direction but it is detrimental if it tapers in the opposite direction. Cylindricity would cover it if I could allow taper in either direction. I don't see how I can use profile or any other gtol but perhaps I'm missing something. I plan to use a note but how to unambiguously express the allowable direction of taper has me puzzled.
----------------------------------------
The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.





RE: Indicating allowable taper
RE: Indicating allowable taper
For other type of parts (machinings for instance) I am searching in my GD&T Toolbox and see only an additional well-thought-out note.
RE: Indicating allowable taper
----------------------------------------
The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.
RE: Indicating allowable taper
RE: Indicating allowable taper
You may try to control straightness of the surface to make sure your cylinder isn’t barrel- or saddle-like.
What will it add to complexity and cost of quality control is another question, as you said the cylinder is really small.
Pmarc,
In my opinion, from geometry point of view, even with diameters being non- concentric, as long as rectangle looks like a trapezoid, you can say part has a taper
RE: Indicating allowable taper
But what if the rectangle does not look like trapezoid?
http://files.engineering.com/getfile.aspx?folder=5...
RE: Indicating allowable taper
On the second thought, words "trapezoid" and "trapeze" have opposite meaning in US and UK.
Maybe your geometry is different from my geometry as well
RE: Indicating allowable taper
RE: Indicating allowable taper
If it falls within dimensional envelope, and taper is pointing in right direction, maybe it’s a good part.
I’ve got the impression that dgallup is more concern with how the taper behaves between the diameters, than concentricity of the diameters themselves.
ASME allows to specify position of both ends of cylinder separately; if we hold one end tighter, this may help.
RE: Indicating allowable taper
RE: Indicating allowable taper
----------------------------------------
The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.
RE: Indicating allowable taper
Mike Halloran
Pembroke Pines, FL, USA
RE: Indicating allowable taper
----------------------------------------
The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.
RE: Indicating allowable taper
I think the simplest and clearest was would be a couple of sketches as a note on the drawing.
Nominal geometry in solid lines. Exaggerated taper as a dashed line.
Two sketches. One showing acceptable taper with "Taper in this direction is acceptable" The second showing not acceptable taper with "Taper in this direction rejected".
RE: Indicating allowable taper
Specify BASIC taper of .001 and apply profile to the surface?