dATUM POINTS FOR C OF G

[biff]

CAN SOMEONE EXPLAIN WHAT i AM DOING WRONG PLEASE?



I want tocreate a datum point for the c of g in an assembly which is driven by relations.



I have been told to use the following info



$d2=mp_cg_x(,prt_csys_def,)

$d3=mp_cg_y(,prt_csys_def,)

$d4=mp_cg_z(,prt_csys_def,)



I know I have to change the csys, but what else beside this and the d value do i change?

 

[dougr]

Why did you write $ in front of each symbolic ??

 

[biff]

So it can be a positive or negative number

 

[especial]

Do you mean & instead of $? Just a guess.

 

[biff]

No, I have used the relations above in parts without any trouble.



However they do not appear to work in an assembly.

so i must be doing something wrong.

 

[dougr]

The last set of defines the path to the coordinate system you want to use for the calculation, if it's empty then the path is to the current assembly.



prt_csys_def doesn't exist in your current assembly does it ???

 

[donha]

Create the Csys in the assy and reference the assy Csys. I would guess if you wanted to reference a part Csys in the assy, you would have to use:

$d2=mp_cg_x:2(,prt_csys_def,)

 

[dougr]

you wanted to reference a part Csys in the assy, you would have to use:



No, the syntax is:



d2=mp_cg_x(,prt_csys_def,123456.prt)



where prt_csys_def would be in 123456.prt