Entities becoming disassociated

[Jacob Featherstone]

I program a waterjet robot that can't have its coordinate system changed at all. So, in order to have the robot cut properly I have to set up the table and the move the part in Mastercam so that everything is aligned.

 

Sometimes when I make a slight rotation about any of the axis’, entities disassociate. I’ll end up with .0001 gaps in my chains. I can rechain with the chaining tolerances bumped way up, but it’s still pretty irritating to have to redo chain selections.

 

I’ve seen it happen with both IGES and Parasolid imports.

 

Is there any setting that I can change to keep geometry together when I move it about in Mastercam?

[George Simmons]

Try going into the WCS View Manager and moving the origin instead of the part.

[Goldorak]

+1 for WCS

 

i also had that problem with iges files

 

i set a new WCS by geometry where i need the part to be then set tplane and cplane at the newly created WCS in WCS mamager

[JJ_8]

Is there ever a good reason to move a part from where it was designed rather than setting a new WCS?

[George Simmons]

Only 2 reasons I can think of...

1) Don't want to.

2) Don't know how.

[Plastmo]

JJ_8, yes, 5 axis machining, if You"ve got operations located on opposite sides, like top

and bottom; becouse mastercam can only create

5 axis toolpath in top orientation.

[Jacob Featherstone]

Sorry, I forgot to mention that this robot is a 6-axis machine so I have to program from the TOP WCS.

 

On top of that, because of the Robot's dynamics, the program must be filtered to adjust for gravity and load on all of the joints. The filter only works for one coordinate system, so if I trick the machine to move to the part and it filters for where it "thinks" it's going I won't be able to hold my tolerances.

[Tyler Robertson]

Trying to recreate your case, but:

Check your Converter settings in Configuration

- try checking "Use IGES file tolerances"

[gcode]

quote:

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I can rechain with the chaining tolerances bumped way up, but it’s still pretty irritating to have to redo chain selections.

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try setting your default chaining tolerance a little higher. Even bumping it to .0002 will help.