How to compensate the Pendulum Length of a 4 axis milling cnc

Anonymous · ‎06-25-2021

Hello,

i'm having some trouble to use this new 4 axis machine with fusion360, i can't find out where i should input offset/compensation for a correct gcode, i'm using a "generic 4 axis model" with a head with Z and A and a table with X and Y (wich is 100% correct) i'm using fanuc.cps the machine like it except for commad G43.3 changed then in G43.

The program in simulation is correct (in fusion360 and also on the machine) but when i run the program the A axis is moving more fast than the X axys (for the pendulum compensation) and i don't know what i can do, hope for some help 🙂 Thank you

brad_francola · ‎06-30-2021

Hi. Your rotary axes move in degrees per minute and your linear axes move in MM per minute. If you have Tilted Work Plane (TWP) use it for 3+2 operations. If you have Tool Center Point (TCP) use it for simultaneous multi-axis.

I believe that G43.3 was trying to activate TCP.

Check this out:

https://www.fanucamerica.com/products/cnc/cnc-technology/tool-center-point-control

Another option is Inverse Time Feed but that isn't as good.