Circles are oval

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keinarsson
Posts: 13
Joined: Mon Apr 08, 2013 9:31 am

Circles are oval

Post by keinarsson »

Hi,

I recently noticed that when i print circles they come out oval on the Y axis.
I tried to loosen/tighten the strap that drives the axis but it still comes out oval.

my test circle of 30 mm comes out 30 on the X axis and about 32 on the Y axis.

any ideas?

keinarsson
Posts: 13
Joined: Mon Apr 08, 2013 9:31 am

Post by keinarsson »

I now just compleated a print of a rectangle and I got the 150mm size on the X axis I hoped for but around 160 on the Y axis.
I have no clue what the problem is.

keinarsson
Posts: 13
Joined: Mon Apr 08, 2013 9:31 am

Post by keinarsson »

Hi, again.

I just made a more accurate mesurement ot the scale problem.
100 mm rectangle is 100.04 on the X axis and 108.36 on the Y axis.
I tried to play with some features in the SFACT but I am not really that good in all this.
My prints were good some weeks ago. but now suddently I have this problem.
Does anybody have any ideas?

angryangel
Posts: 110
Joined: Sun Mar 31, 2013 11:01 am
Location: Germany near Heilbronn / Heidelberg
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Post by angryangel »

perhaps you should try a other profil or reinstall the s fact profiles first

so you get know if this is a setting problem or a printer problem

keinarsson
Posts: 13
Joined: Mon Apr 08, 2013 9:31 am

Post by keinarsson »

Thanks for the reply...
Well I did reinstall the repieter host and reload the Merlin firmware. I have the same problem in all profiles i tried... draft, normal and production.

keinarsson
Posts: 13
Joined: Mon Apr 08, 2013 9:31 am

Post by keinarsson »

update!
I just switched the X axis motor and sensor with the Y axis and the problem is still on the old Y axis, so I belive it must be a problem somewhere there.
Is it possible the stepper motor is just stepping 8 % more? Bad motor?

keinarsson
Posts: 13
Joined: Mon Apr 08, 2013 9:31 am

Post by keinarsson »

Well,
I figured out I can get it correct by changing the aspect ratio of the axis. At least now I can resume printing, its resonably accurate but I would like to fix the problem.
If If anyone has any ideas, please let me know!

satoer
Posts: 436
Joined: Mon Oct 01, 2012 8:00 pm
Location: Netherlands

Post by satoer »

This is strange... everything should be exactly calibrated out of the box. You could recalibrate the Y axis in the firmware. See:
http://buggerit.blogspot.nl/2011/09/hai ... ation.html

But this supposed to be spot-on.
My Felix 1.5 printed designs on Thingiverse
E3D V6 Hot end upgrade for your Felix
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keinarsson
Posts: 13
Joined: Mon Apr 08, 2013 9:31 am

Post by keinarsson »

Well it was, until recently! I will have a look at that link and see if there is something i can do.
I am now printing with the Y axis scale at 0.93.

kimmoli
Posts: 62
Joined: Fri Mar 08, 2013 1:15 pm
Location: Finland

Post by kimmoli »

stupid things to check:
- are the belts tight enough?
- are your pulleys tightened to motor?

I had symmetry issues when one pulley was not tight enough. Try to turn motor by hand, and check that bed/head moves also (and that you can feel the step of the motor)

Or have you tuned your potentiometers at driver board correctly?

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