Yes, 4.1 does not support center of gravity. The tool frame defines the tool center point.
What you can do is add properties to the tool frame using API. For example, you could add a Real property to tool frame that allows you to define LoadMass, a Matrix or vector proeprty to define center of gravity. These, of course, are not used by the software. But the data is still there in the tool frame. You would just need to modify the post-processor to extract that data and map it accordingly.
Another option is to use a statement handler or python script to modify robot movement manually based on load and center of gravity properties that you add to tool frame being used. For example, if load is 10.0kg and center of gravity is 200mm along Z-axis, joint speed is reduced to go to next position. But remember, you have to do this all manually in 4.1.
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