# CENTRE OF GRAVITY COMPUTATIONS IN PRO-E?

Hi!
Can anyone help me explaining how to determine the centre of gravity in PRO-E for any part

Hello,

This can easily be done in Pro/E. Please see the attached document that explains the process.

Good luck.

Thanks a ton, for ur help
I still need to figure out how to do impact analysis on the structures of robot using
Mechanica

As for using Pro/E Mechanica to analyze structure, there are plenty of tutorials available.

You might want to check out the one from Carnegie Mellon - http://www.me.cmu.edu/academics/courses/NSF_Edu_Proj/Wildfire_short_course/tutorials.htm

Look at the bottom of the page.

Mark

Can we replicate a single step and apply the same to other process?
For Example: Adding nut to the bolt in one step and copying the steps or manipulating them to add bolts to other nuts?

I am not familiar with this, I would recommend making sub-assemblies and then using those to speed up the process.

There is a method for that, when assembling components.

You first constrain the first instance of the components as normal. Then you select a component to duplicate and go to Edit | Repeat. That brings up a dialog box where you pick which constraints you’d like to not reuse when placing the duplicates. (If you leave constraints deselected, it reuses the constraint from the first component; if you select them, you can click on an alternative object of the same type to constrain it to that.)

Once you’ve picked the constraints to vary, then you click Add, and click on the new references, in order. Repeat this order for as many components as you want to add.

This is actually one of the biggest time-savers, when dealing with lots of similar constraints.

Another option is to use reference patterns. If you pattern the holes that a bolt goes into, then you can pattern the fasteners that go in it. The best way to do this is to create one initial hole feature. Then constrain a bolt in the hole by inserting it (and adding whatever other constraints you need). Then constrain a nut—but I believe you’ve got to reference the hole somehow, so use the insert constraint on the hole.

Pattern the hole, with whatever options you want. Then, when patterning the nut and bolt, the option of “Reference” will be available. Use that, and it will refer automatically to the existing hole pattern, and make dependent copies.