ISO-ASME Cylindricity vs Positional
ISO-ASME Cylindricity vs Positional
(OP)
I have a Dia 10 -0.005 -0.011 bar with several grooves interupting the diameter. The ISO callout suppliments this with Cylindricity 0.004 and Circularity 0.004. There is also a g5 after the dimension.
The confusion comes in trying to determine the virtual condition envelope. ASME Rule #1,ΒΆ2.7.1. yeilds a Dia 9.995
h ttp://www. eng-tips.c om/viewthr ead.cfm?qi d=176019&a mp;page=20 points out that one of the ISO/ASME differences is the envelope interpretation. How does one generate the virtual condition envelope within the ISO guidelines?
Thanks.
The confusion comes in trying to determine the virtual condition envelope. ASME Rule #1,ΒΆ2.7.1. yeilds a Dia 9.995
h
Thanks.





RE: ISO-ASME Cylindricity vs Positional
Is it "DIA 10" with a tol of "-0.005 -0.011"?
Chris
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RE: ISO-ASME Cylindricity vs Positional
RE: ISO-ASME Cylindricity vs Positional
I think the biggest difference between the two standards is that while the ASME standard uses a general rule to control the form of a feature by default, the ISO standard requires that you either put the E with a circle around it to invoke the envelope principle which is like rule #1 OR you must specifically control the form of the feature using form controls. The interpretation is the same but it's the fact that ISO doesn't default to the envelope principle like ASME does that makes the difference.
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RE: ISO-ASME Cylindricity vs Positional
RE: ISO-ASME Cylindricity vs Positional
Powerhound, GDTP T-0419
Production Supervisor
Inventor 2008
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SSG, U.S. Army
Taji, Iraq OIF II
RE: ISO-ASME Cylindricity vs Positional
Powerhound, I have a pretty good grasp of the ASME interpretation. You state it well as you usually do.
What I don't understand is the ISO intent. Since there are two form controls assigned to the diameter and the circled e is not present - is the ISO form control bound by the Dia. 9.995 Virtual Condition Envelope, or is the Envelope modified by the stated form controls?
RE: ISO-ASME Cylindricity vs Positional
Powerhound, GDTP T-0419
Production Supervisor
Inventor 2008
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Taji, Iraq OIF II
RE: ISO-ASME Cylindricity vs Positional
Since the drawing references ISO, would the ISO gage be 9.995 dia as well, or does the Cylindricity get added into the equation for a 9.999 dia gage?
RE: ISO-ASME Cylindricity vs Positional
HELLLOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO...any ISO guys out there?
Powerhound, GDTP T-0419
Production Supervisor
Inventor 2008
Mastercam X2
Smartcam 11.1
SSG, U.S. Army
Taji, Iraq OIF II