hi there,

I am using a polargraph v2 and I have some problems with asymmetrical drawings. (I've already checked my machine specs 10 times and remeasured... and everything seems to be adjusted correctly. > I read the posts about bad homing and other forum-posting but I didn't find the solution.)

I have a sagging line at the top of the page and the gondola always moves beyond the bottom edge of my paper.
however, when I move the gondola 2cm up, the sagging line gets better, but my drawings keep getting distorted, with the left side (lines from top to bottom) being not straight and veering off to the right.

So I wonder, what could be the issue? Any help is greatly appreciated. (Otherwise the polargraph is a wonderful piece of equipment, btw.)

Simon

hey sandy,
thank you for your quick response!
I tried again and made sure that I follow every step you mentioned above.
but again, the drawing gets distorted. the machine still thinks that the paper is 2 cm larger at the bottom, then it actually is. also no errors in the console, when I uploaded machine specs. also the top line gets really whobbly, which is not the case with the other lines...
when I tried to draw a simple rectangle inside the the edges of the paper, I got following result. those are my properties.

thanks for helping! 🙂

# *** Polargraph properties file ***
#Wed Dec 06 16:00:02 CET 2017
controller.pixel.samplearea=1
controller.pictureframe.position.y=136
controller.pictureframe.position.x=57
controller.testPenWidth.startSize=0.5
controller.machine.colour=969696
machine.motors.mmPerRev=95.0
controller.window.width=1243
controller.frame.colour=C80000
controller.image.position.y=167
controller.image.position.x=378
machine.motors.accel=700
controller.image.height=285
controller.machine.serialport=3
controller.window.height=653
controller.maxSegmentLength=2
controller.geomerative.polygonizerLength=1
machine.penlift.up=148
machine.penlift.down=60
controller.page.position.y=120
controller.vector.scaling=121.6
controller.page.position.x=100
controller.pictureframe.width=774
machine.step.multiplier=8
controller.grid.size=7.0
controller.testPenWidth.endSize=2
controller.pictureframe.height=1052
controller.page.colour=DCDCDC
controller.testPenWidth.incrementSize=0.5
controller.image.width=428
machine.motors.stepsPerRev=200.0
machine.pen.size=1
controller.page.width=700
controller.pixel.mask.color=00FF00
controller.machine.baudrate=57600
controller.vector.minLineLength=0
machine.width=920
controller.geomerative.polygonizer=0
controller.page.height=1000
controller.vector.position.y=152.22
controller.background.colour=646464
controller.image.filename=
controller.vector.position.x=87.37
controller.homepoint.y=120
controller.guide.colour=FFFFFF
machine.motors.maxSpeed=600
controller.homepoint.x=460
controller.density.preview.style=6
controller.pixel.scaling=1
controller.densitypreview.colour=000000
machine.height=1500

Well, i asume that the mistake is only on my side 🙂 but i just don't know where to look anymore. I didn't go through the process of building it.myself, so i don't know a lot about the machine...

thank you so much for your thoughts and effort! I spent some more hours on the machine today and I still understand where the error is, but I found a solution so work with: homepoint (y) for the machine is now 140mm while in reality its 120mm. I also increased the margins towards the edges of the paper, so the drawing is more in the middle of the page. the distortions (understandabley) nearly disappear towards the center of the page and I have good results! (still a hack, but maybe some day I'll understand why/what/how)! big thanks anyhow!