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Again the same problem today...
The first two pictures are from two different attempts giving the same error on the same potitions.
Same settings , same gcode file.
Depends from what day is???
It...

"Caution: Keep collets clean, a piece of debris or dust between the collet and bit can cause the bit to spin elliptically, harming bit, part or even operator"

from:
Router Bit Basics

This is the today work.
Tracks are with order 0.1 0.2 0.3 0.4 and 0.5mm wide
Dimension of the pcb is 30 x 30 mm.
Feedrate = 1000mm/min , Accel = 100,

PCB-gcode settings : Isolation : Default:...

You are right about mofication. I had been pissed of with this router since I bought it. This Info maybe much usefull to many CNC3020 or similar Routers:
First I found that the motors cable are bad,...

I have inspected the bit, not just with a magnifier but with microscope and it seems fine , thanks :)

I measured the travel of X and Y individually with the caliper and they are correct

To tight the coupler allen screws with Electric tool?

Does the spindle runout influencing this or to rule out this cause?
Because I see the dots at the pcb4.jpg are seem fine.

I noticed that the bit is not moving freely all the times.
It seems to...

thanks, I ll check this tommorow with the caliper.
But how at my last Picture some days ago seems fine (the diagonal tracks), I cannot understand...

There are no mechanical modification by my site on this Commercial machine,
if I understood well your point.
The transmission is from step Motor to the screw via a coupler and the from the screw to...

A Picture of the same circuit some days ago.
It seems almost perfect for such a cheap machine.
Tracks are 0.4mm in design and in milled PCB
:)

Thanks a lot for your replies :)
First pls forgive me for my bad english.
My machine is this chinese CNC3020 from ebay.
So the hole system is Cheap.
But I didn't have this problem before some...

Hello everybody,
I am looking for your help as I believe an experienced eye from the forum will know the problem and the solution.
My setup does not seem to loose steps.
I am using Eagle,...