Circle a bit deformed

[Erik.Snell (Erik)]

I’m on a Foreman Pro using Carvco to produce gcode. I was trying to cut some circular coasters when I noticed my circle is far from circular. Any ideas on how to fix this issue?

I believe my rails are parallel. What is the best way to test?

[OnefinityCNC (Onefinity Support)]

Did you happen to throw out your red couplers?

Red Bushings on Motor Coupler. What is it? (Do not throw away) FAQ

The Red Bushings (shaft coupling) on the motor coupler are not packaging. They are an integral part of the coupler and required for the machine to move correctly. Flexible shaft couplings are used to connect the shafts of a stepper motor and the driven load or mechanical system. They allow for the transmission of torque while accommodating misalignment, reducing vibrations, and protecting the motor and driven components. Without these red bushings, the machine will not cut correctly as there w…

[Erik.Snell (Erik)]

Nope. Those are still in place. I’m trying again. This time creating the gcode from Fusion. I want to cut out the software from the troubleshooting equation.

[OnefinityCNC (Onefinity Support)]

What post processor did you select?

[Erik.Snell (Erik)]

On Carveco “Onfinity - BB (inch)”
In Fusion “onedinity_fusion360.cps” v2022.02.21.1

[Erik.Snell (Erik)]

Created the same part with Fusion. Much better results.

[PezWoodworks (Pat)]

Carveco should be able to produce a perfect circle with no problem, something had to be off somewhere.
Pat

[Erik.Snell (Erik)]

Agree but what was off? I can’t seem to find it.

[ChrisM (Chris Moore)]

Can you post the NC code that made the part that was so badly out of round?
We will then be able to tell you for sure if it is or is not the post processor.