Tolerance of Nominal dimension

[charleskim]

On WF4 (M220).
Why does ProE let me change the tolerance of nominal dimension (from Dimension Property)? Is this a bug?
Tolerances should be grayed out (they used to be grayed out in WF2) on Nominal dimensions and use general tolerances.

Also when I change the Number of decimal places, tolerances does not change to general tolerances.

Thanks,
Charles

 

[dr_gallup]

Having tolerances on nominal dimensions is actually a very useful and
little documented feature (par for PTC). Since dimension modifiers like
max and min are just added text in Pro/E, the ability to set +tol to 0
and -tol to some reasonable value then change the dimension bound to
middle lets you have a drawing that says R0,3 max with a corner radius
that actually measures 0,2. This is very important when you are
providing CAD models to mold makers or FEA analysis where you want all
geometry to be centered, not drawn at max or min values.



This is not a change in WF4. You have been able to set tolerances on
nominal dimensions for a very long time (since way before WF).

 

[charleskim]

You are right on being able to set tolerances on nominal dimension on older version. I checked it on WF2.

But I don't agree with how it functions.

In WF2, if I change decimal place on nominal dimension then the upper and lower tolerances will be change to match general tolerances.

Let's say X.X =

 

[dr_gallup]

In the past Pro/E did change the tolerances when you changed the number
of decimal places. It did this for all dimension modes (nominal, +/-,
+/- sym, limits). A lot of people complained about that because if you
had special tolerance values applied it would change them to default
when you changed number of decimal places. That created lots of
problems.



PTC should have implemented a policy that the tolerance would only
change if you had default tolerances and stay the same if you had set
different values.

 

[kdem]

Try adding the config option default_dim_num_digits_changes
to your config file if it's not there already. Can't
guarantee this will work since I don't have WF4 installed
to try it out. I'm using WF5 and CREO 1. In WF5 it works
but there are also some additional config options that
could be affecting this that aren't available in WF4. In
CREO 1 it works but not the same as in WF5. They removed
the tol_mode option which seems to have caused the option
default_dim_num_digits_changes to no longer work the same.
Edited by: kdem