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Part Thickness Limitations

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marksummers

Mechanical
Aug 29, 2007
27
I am building a part model of a PCB (printed circiut board) in Pro/E, and need to model individual layers so I can included the stiffness of my ground planes when I inport it into Pro/Mechanica. The PCB is about 9.00" x 15.00", so it is a simple extrusion. However, when I type in the thickness of 1 ounce copper (.00135) for the extrusion depth, it balks and won't let me go any lower than about .003". I tried extruding teh part 1.000" and then subtracting .99865" away to leave a .00135" thick part, which it will let me do, but them there is no model left over.

Is this an inherant limit in Pro/E, or is there a setting I can change to go to a .00135" thick part?
 
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there are some config options with that too

accuracy is under edit> setup> accuracy

wf2
 
Where might I find that option? Is it accuracy_lower_bound? If so, what configuration file does this parameter live in?
 
It does not matter what file it is in as long as it gets loaded. Pro/e loads 3 by default & you can manually load others.

For circuit boards you will probably want to convert to absolute accuracy and set it smaller than your .00135".

I think I would set:

enable_absolute_accuracy yes
default_absolute_accuracy .0005

Or create a start part with those settings.
 
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