Parallel Toolpath creating gully channels with minor Z axis moves.

[f6712116]

Problem: 

When processing with parallel toolpath it creates gully channels on the surface (depth is likely 0.3/0.4mm). 

It makes it especially at the lines where it connected to some circular shapes on the flat surface. 

Prior to my previous toolpaths on parallel, only difference that I felt is feed optimization is enabled before. However on the previous works I have not seen toolpaths created by feed optimization as well. So this is kind of odd to me.

And Interestingly when I ran simulation, I can see the similiar output on simulation rendering.  I am confused at this point if it is a setup problem,  gcode problem, processor problem or machine problem at all (Machine works fine at that areas without this toolpath.)

P.s: It doesnt matter if I change the pass direction to 0 or 90 degrees. Same gully channels at same starting point happens again aligned with that pass direction. Therefore I highly suspect on something wrong with toolpath creation.

Tool Used:  3mm ball end-mill carbide

Material: Aluminium 7075

More photos at the attachment to give an idea.

 

[fr33l0ad3r]

Could you please share the file? Screenshots are too blurry.
Did you ran more than one part? Was it gouged similarly?

[f6712116]

Hi, 

Yes By moving my z offset to down by 0.5 mm each time, I have ran the program many times, however everytime same situation occurs. Only thing I have not tried is feed optimization but I see small relation with that what I am experiencing so far.  File at the attachment.

[fr33l0ad3r]

If smoothing is not applied then it must be Z axis nut

[f6712116]

No, no smoothing applied.     

Nut is a ballscrew, cleaned and well integrated but I can suspect on pulleys for Z axis, which might be the thing.
I will observe while spindle making pass through faulty lines,  I will observe Z axis machine position, if the Z position is the same on computer (than theoretically it shouldn't creating this problem) than you are right. I will focus on the machine.

[fr33l0ad3r]

Try to set up passes in such a way that machine will follow full circle,
i.e move one way w/out zig zags. Dunno how, but maybe some 3D operations
allow that.

[f6712116]

Issue resolved. It was Z axis problem on the machine. Top Plate where the Z axis motor is mounted was moving on the micron level. so making it more rigid fixed the problem. (It's a CNC router)