[sol9253]

Hi guys

There's a problem with fanuc 15m CNC machine, which is creating a squashed circle towards 45 degrees.

I have tried so many things in parameter, I have not found a solution.

One of the modifications I have made is 1478 (automatic corner deceleration) and it has shown some difference.

but whatever I put any number into 1478, the cnc machine doesn't move smoothly at each point and it works as if you put G61 code.

anyways I still got titled or oval shape circle and no solution for accel/decel parameter.

please help me solve these problems.

Thank y'all

[Superman]

Check your leadscrews, it could be the connection between it and the motor, or thrust bearing end play.

May even be play in leadscrew nut(worm ball bearing).

Try turning/moving by hand with power off.

Elipses instead of circles is indicative where the reversal direction slop is taken up.

[sol9253]

firstly, thanks a lot for your reply.
I have checked the leadscrews and thrust bearing, there was a little amount of play.
I'll fix them through re-metalworking.