Axis correction

RAyWB

Hi,

as i use Repetier FW in a mill and i´m working with a 10Kg load (Mill Motor) on x Axis i have following Problem :

when i move X-axis from 0 to 520mm there is some small bending in my machine.

which is -0.1mm at Position x=0 ; 0 at x=260 and -0.1mm at Position x=520.

this bending is independent of y and z Position and just caused by the weight of x-slider+Motor.

can i use bed correction to compensate this?

as far as i understood bed correction is just for a couple of layers but i Need that as a permanent correction

over the complete z-Range.

any Idea?

RAyWB

BTW , seems to be linear, so starting from x= 0 means to subtract 3.85 microns per mm from Z up to x=260 and from there add 3.85 microns per mm from Z up to x=520.

Repetier

You can use bed distortion G33 for that. Also normally only for the first layer you can set until which height you want 100% correction and that can also be machine height. You can set G33 manually if you want.

RAyWB

Ok,

i can´t use z-probing because i need opposite direction of correction

so my question :

how can i generate correction Matrix manually?

Repetier

I was quite sure it wa sin repetier.ino but it wasn't. Here the options:

- G33 - Measure distortion map

- G33 R0 - delete distortion map

- G33 L0 - List distortion map

- G33 X<xpos> Y<ypos> Z<newdistortioncorrection> - Set new distortion for nearest distortion point.

L0 returns the command to restore current state. Copy this to quickly define your correction and then send the commands.

RAyWB

Ok, thank you.
One more question please as my correction is like  a V-shaped line falling linear from 0.1 mm at x=0  to 0mm at x=260mm and rising from there to 0.1 at x=520  (its completely independent from y position) how many points do i have to define?

do you think  a 3x3 matrix is enough?

Repetier

Yes, with so linear behaviour even 3x2 would work. We interpolate linear between points and you say beding is linear as well, so no need for more extra points.