Hi guys. Is this caused by loose belt, router wobble or?
Could be an number of mechanical issues really only someone seeing it run can tell you that. Backlash, loose hold Downs, Bearing slop, loose couplers, extrusions flexing. Try dropping the feed rates.
Did it return to zero after the job? You might be loosing steps.
What controller are you driving with?
@Alex_Krause gshield (grbl)
@Paul_Shaw Thanks im going to adjust a couple of things
Backlash and possibly not having the Spindle square with the table.
It looks like backlash
Are you talking about how it looks like the two circular holes in the bottom left look like there are additional circular holes overlapping with them or all of the fur on the walls?
With the machine locked down from freely moving, i would apply pressure at the spindle in each the x, y, and z directions and look for any play, wiggle, of flex. Then work backwards to locate the source of the problem and tighten it down.
Belt or pulley slipping
I had the same problem with my old machine. It is definitely backlash. Because of that I rebuild my machine and put all 3 axes on acme lead screws. Works perfect now.
All you can do is tighten your belts which is only a matter of time until you are back to what you have now. You also can try climb/conv. cut and less depth per cut but that didn’t really work for me either. It did make the outcome better but I wasn’t happy with it so I redesigned my machine. Hope that helps
They evidently make some reinforced belts that will not stretch, if that helps.
Regardless of reinforcement or not there will be always more backlash on belts compared to screws. But it is always a price question. For me it is a screw drive of some sort.
Feed rate might be too high and the endmill may be tossing itself to the side as a result since it is a belt drive.
Agree.