How can this be?

[BANDY]

How can this be? Measuring a cylinder and dimensioning for a radius 1.18 +/-.030
result is 1.180 zero dev. out of tolerance .030. I am confused. See report. Part is not on the table yet just started to program with igs model , using 4.1.

[John Kingston]

Can you post the code? Might be your tolerancing. I have inadvertantly typed in a minus for the mius tol. Gives funky readings then.

[BANDY]

I have pasted the code from the edit window just under the report. As you see it shows +.030 and -.030 . If I change the the "- tol " value to .060 for example then the outtol will change to .060 too. Something I must have change in the preferences...

[Matthew D. Hoedeman]

Yep, that would be my bet. Enter the ABSOLUTE value of the negative toelrance, Pcdmis assumes it is a negative value. So, if you enter in a negative value, you get a doubel negative, which IS a positive value.
This is to allow you to bracket your tolerance band all on one side of nominal. For example, a hole with a nominal size of 10mm, but the size tolerance is +0.05/+0.10, so you would enter in a NEGATIVE 0.05 for the negative tolerance amount, thus giving the lower limit of +0.05.

[BANDY]

Yeah I got it now. In the feature location dialog box I had to enter -.030 where its asking for the minus tolerance. don't make sense since its asking for a MINUS tolerance. why would I need to type the minus symbol , but whatever. its works now. Thank you for the help.

[Matthew D. Hoedeman]

Check the F5 setup, under the DIMENSIONS tab, see if MINUS TOLS SHOW NEGATIVE is marked.

[BANDY]

Yes, that what I have changed...DUH!

[Underspec]

Would be interesting to see when editing the tolerances in the command mode edit window instead of the F9 way if it changes also.