Z axis cutting uneven

[wadeanres]

My models look good in simulation but my actual CNC carve is coming out with uneven parallel passes. My Step Over is fine on a .125in bit I'm only stepping over .35 mm and only cutting 2mm deep.  My passes are smooth but there does seem to be a bit of play in my Z axis assembly,  I'm using a stock X carve Z axis.  I can't seem to eliminate the slack in the assembly.  Anyone else run across this problem?

Thanks,

Wayne Dean

[seth.madore]

This sounds more like a mechanincal issue than a Fusion toolpath issue. Have you double checked to make sure all your belts and set screws are tightened properly?

[wadeanres]

Hi Seth, Yes I've checked everything. My cuts are nice and clean then a
few hours into yhe Finish Pass it starts to cut uneven paths. I think the
bits might be it. I'm trying a model that has cut fine in the past.
Thanks for your help.

[wadeanres]

Hi Seth,

As a follow up, I think my problem was a bit issue.  I used a new bit that seems to be my problem.  I used my usual choices and settings on an old model and it cut fine.  I think it was my bit the whole time.  Thanks again.

Wayne A Dean

[wadeanres]

Hi Folks, solved the problem.  It was my bit.  I was using a new bit that I had purchased for Finish work but apparently my machine doesn't like it.  Ran the same settings but used a bit that I know cuts well.  A nice smooth finish.  Thanks for all your feed back.