Shapeoko 3 circles problem

Assembly questions and answers for the Shapeoko 3 CNC Mill
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tek
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Shapeoko 3 circles problem

Post by tek » Sun Feb 14, 2016 8:57 pm

I have problem with circles on my Shapeoko that I just put together. I notice this same problem when I'm cutting with bits and drawing using pen. All belts are tight. Same happens it seems anywhere on the bed. These circles in the picture are 10mm diameter.

Can anyone point me in the right direction, what do I need to adjust? Thank you.
ShapeokoCirclesWrong.jpg
ShapeokoCirclesWrong.jpg (374.61 KiB) Viewed 1825 times

twforeman
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Re: Shapeoko 3 circles problem

Post by twforeman » Mon Feb 15, 2016 12:39 am

Most likely your machine is out of square.

Make sure that the X and Y rails are square to each other and that your Z rails are perpendicular to the bed of the machine.
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tek
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Re: Shapeoko 3 circles problem

Post by tek » Mon Feb 15, 2016 12:52 am

Yeah, I got it to run better, the X rail was not square to the side Y rails. I had to use clamps (your idea :mrgreen: ) to bring them close to square and circle is much better. I did not get from your descriptions how did you check them to make sure they are square. I looked at how the X rail sides meet the ends where Y rails are attached.

twforeman
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Re: Shapeoko 3 circles problem

Post by twforeman » Mon Feb 15, 2016 1:27 am

Ah, yes, I never did talk about how I measured the squareness.

I held a 1-2-3 block on the Y rail and placed my large engineers square against the X rail and the 1-2-3 block. Maybe I'll have to get my wife to come down and take a photo of it - it takes two hands. :)
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cvoinescu
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Re: Shapeoko 3 circles problem

Post by cvoinescu » Mon Feb 15, 2016 2:30 am

Belts tight, that's good. Also check for a loose pulley set screw.
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twforeman
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Re: Shapeoko 3 circles problem

Post by twforeman » Mon Feb 15, 2016 2:45 am

Here you go - this is how I checked it: http://www.shapeoko.com/forum/viewtopic ... 625#p60625
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tek
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Re: Shapeoko 3 circles problem

Post by tek » Mon Feb 15, 2016 2:48 am

Great! Thank you, gives me some other ideas to try as well.

eslc
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Re: Shapeoko 3 circles problem

Post by eslc » Sat Jul 31, 2021 2:47 pm

How are you attaching the sharpie? It’s possible the sharpie moves in certain directions. That’s what happened to me during initial tests. Looked terrible.

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