Help squaring shapeoko

scott216
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Help squaring shapeoko

Post by scott216 » Mon Apr 13, 2015 3:57 am

I've got a Shapeoko 2 and I cut a 6" x 5" x 0.06" pocket hole in plywood today. I noticed it wasn't square. I measured two sides and they were 87 degrees instead of 90. I'm having trouble trying to correct this. Any suggestions?
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CastIrony
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Re: Help squaring shapeoko

Post by CastIrony » Mon Apr 13, 2015 4:05 am

Shapeoko 3 #192 - Complete! Needs limit switches.

scott216
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Re: Help squaring shapeoko

Post by scott216 » Mon Apr 13, 2015 4:09 am

Yes, I read through all that. I am planning on doing the circle-square-diamond test tomorrow. But I already know the square will be off.
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scott216
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Re: Help squaring shapeoko

Post by scott216 » Thu Apr 16, 2015 3:44 am

I went through my Shapeoko and tried to square it up the best I could. When I bring the gantry all the way to the front, the distance of the motor mount plates from the end plates is the same. I've got the two y-axis rails parallel. But it's still not cutting squarely in the x-y axis. I did a simple test where I drilled four holes to make a square pattern. The holes were 4 inches apart. Then I used calipers with centerline gauge accessory (McMaster 20415A51) attached and measure the diagonals. One diagonal was 0.037 longer then the other.

So what's the right way to adjust the shapeoko when X-Y are not square? I loosened the screws that hold the gantry in the motor mount plate and slid it back a bit, but that didn't help. Should I try to adjust the belt so it shifts one side forward a bit. I saw a picture where someone had put shims between the end plate and extrusion. Is that a way to get things square?
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WillAdams
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Re: Help squaring shapeoko

Post by WillAdams » Thu Apr 16, 2015 3:57 am

Yes, twforeman’s blog post on squaring up his machine is the most exhaustive, and using shims at need is one strategy to bring things into alignment.
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twforeman
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Re: Help squaring shapeoko

Post by twforeman » Thu Apr 16, 2015 7:08 pm

Squaring is a bit of a pain and an iterative process.

Shims are one option.

If you have dual motors on the axis then you can adjust the belts until the machine is square. Do this with the motors energized. I'm not sure that they startup in the same spot each time though, I have not played with that much yet.

I have a new S3 to play with now and will spend some more time figuring out how to square it up too.
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scott216
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Re: Help squaring shapeoko

Post by scott216 » Mon Apr 20, 2015 3:44 am

I'm having lots of problems correcting this. The other day I spent a couple hours trying to adjust the belts, but when I got it close, the drive gear would jump a notch in the belt. I had the belts very tight. Today I spent several more hours trying to fix this by sliding the front end plates to to the left or right. This didn't seem to do anything, and I felt like I was twisting the machine. I moved the plates over 1/4".

To see how if my machine is setup square, I clamped a high quality machinist's square on the y-axis rail, then I used the probe function to against the square to see how far off the y-axis was. Over a 6" distance along x-axis, the y-axis as about 0.030" off. I'm pretty frustrated with my inability to get the shapeoko square. I can't believe how much time I've spent wasted on this already. Ugh. Any ideas?
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REdington
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Re: Help squaring shapeoko

Post by REdington » Mon Apr 20, 2015 3:58 am

Scott,
I too had problems getting my X squared and I finally took it off and made sure the end was square like this (side) and (I can't find the other pic) the top. Once bolted back together, it has stayed square.


Image

scott216
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Re: Help squaring shapeoko

Post by scott216 » Mon Apr 20, 2015 11:59 am

Yeah, I think I'll have to start taking things apart and trying to find the root cause.

I just got done reading your build log - awesome job. You're Shapeoko should be much stiffer than stock. I wish I had some of your metalworking equipment! I'd really like to get a Bridgeport, but I'd need a bigger shop first.
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scott216
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Re: Help squaring shapeoko

Post by scott216 » Tue Apr 21, 2015 3:33 am

I took apart the gantry and put the aluminum extrusions on my surface plate with a machinist's square and the ends are not square. I just checked one extrusion; since it's not square, I'll have to get both machined anyway so the lengths match. I've got a guy who can true them up for me. Hopefully this is the cause of my problems.
Gantry Rail 1.jpg
Gantry Rail 1.jpg (205.5 KiB) Viewed 3208 times
Gantry Rail 2.jpg
You can see the gap better in this picture
Gantry Rail 2.jpg (101.54 KiB) Viewed 3208 times
Shapeoko v2 with DW660
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