Accuracy tuning

Hey guys,

I need your help in accuracy tuning.
The servos are tuned well, now. So the F-Error is about 0.0001mm at F10.000mm/min in all axes.

But when it comes to cutting material, let's say a rectangle part of 20*30mm it cuts 20.045*30.045mm
Where is the mistake?
All the bearings ect. are like new- with the original Siemens 810M control it cuts on 0.001mm like programmed.

I hope you guys can help me with that.

Thanks, Joel

Hey Andy,


The machine has 1250 Imp. Encoders - x4 = 5000 Imp/turn
The motors have 22 teeth, the leadscrews have 44 so the Ratio is 1:2
The leadscrew has a 5 mm thread pitch.

So what I did is calculate 5000 / 5 =1000- that's what stands in my ini file.

Is that wrong?

Greetings

is there a tool involved in the cutting
so you got the 0,045 offset

Oh shit, sorry ! I meant tommy / Tom :-D
I think I just saw andy :-D :-D

Sure is there a tool involved, that is also compensated- Same dia like before with the siemens control, now with linux it is driving me crazy :-D

So I need to compensate the error with the new encoder calculation with a pitch of the error +5mm ?

Thank you guys!

backlash?

Oh lord,
I've made a mistake in writing down my actual setup.

The machine has 10mm pitch ball screws- so 1250*4=5000 | 1:2 Ratio = 5000*2 =10.000 | 10mm per turn =10.000/10 =1000 Imp/turn

So the Ini is definitly correct.

What I also have tested so far is set a dial gauge at lets say G54 X0 then moved G0 X250 G0 X0- It shows nearly 0, about 0.004-0.005 overschoot.

So the last part could be a mechanical problem?
What I dont want to understand is, that with the siemens controll, the mill just machined the programmed contour, and why should it now be more worse than before....

Thanks guys!!!