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4 Axis Lathe - Polar Interpolation G12.1 for Off-Center Holes


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Haas uses a "y" axis address using G112. The idea is that you could take straight mill code, alter start and end commands and run it. It does not matter if the machine has an actual y axis or not. G112 always uses a Y axis address to simulate y axis movement.

FANUC uses a C address with G12.1. Same functionality as Haas, but the c address while using g12.1 is the simulated y axis motion. 

I do believe FANUC's C axis commands are in radius compared to Haas Y axis values in diameter. But it has been years since I had access to both. Might also be a parameter on the FANUC side.

G12.1 or G112 will always give better results than polar as the control is handling the c axis steps and feed rate calulation. Due do the disimilar units of the x and c axis. 

Why do you want to spin the c axis 360 degrees to cut an off center hole? You can machine 360 degrees of the off center hole with limited physical c axis movement. 

Did you check centerline of your axial live tool with a coaxial indicator or a super rigid test indicator setup? AKA not using an arm on a mag base.

Could also be backlash in the c axis causing holes to be small.

 

 

 

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