Please help...

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rocket2004
Posts: 37
Joined: Sun Mar 13, 2016 7:22 pm

Please help...

Post by rocket2004 » Sat Apr 16, 2016 2:25 pm

2 circles not.jpg
2 circles not.jpg (344.3 KiB) Viewed 780 times
Hello,

My Shapeoko 3 will not produce circles properly, I have
done all types of alignment suggestions, reset GRBL in Carbide Motion and
other things...

The attachment show what happens just with a pen.

Any ideas...

RR

xfredericox
Posts: 292
Joined: Mon May 04, 2015 10:46 am

Re: Please help...

Post by xfredericox » Sat Apr 16, 2016 2:40 pm

is the pen stiff enough? It could just be flexing because your z height is too low
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rocket2004
Posts: 37
Joined: Sun Mar 13, 2016 7:22 pm

Re: Please help...

Post by rocket2004 » Sat Apr 16, 2016 3:06 pm

xfredericox wrote:is the pen stiff enough? It could just be flexing because your z height is too low
No.......try all of that.....

This problem goes much deeper..............

sgth0mas
Posts: 101
Joined: Sat Dec 12, 2015 5:57 pm

Re: Please help...

Post by sgth0mas » Sat Apr 16, 2016 6:46 pm

Did you check to ensure no pulleys or belts are slipping?

plastik
Posts: 13
Joined: Fri Apr 24, 2015 2:07 pm

Re: Please help...

Post by plastik » Sat Apr 16, 2016 9:44 pm

check that the Y pulleys are correctly tightened on the motor shafts.
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DRobs86
Posts: 148
Joined: Fri Jun 05, 2015 4:19 am

Re: Please help...

Post by DRobs86 » Sun Apr 17, 2016 7:38 pm

How is it when just moving in one direction?

Move in x. Did it travel as far as expected?
Move in y. Did it travel as far as expected?
Now move diagonally, say 250mm. Did it travel as far as expected in both directions?

Do any v wheels have a flat such that the machine is cogging along instead of rolling?

Are both Y motors actually turning? The circles look somewhat like the machine is yawing about the z axis, meaning that its moving along one Y rail then the other gets dragged along.

cvoinescu
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Location: Camberley, UK
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Re: Please help...

Post by cvoinescu » Mon Apr 18, 2016 6:21 pm

Turn the machine on, so that the motors energize, but don't tell it to move. Do not turn the spindle on. Try to wiggle the spindle left and right by hand. Can you move it? If you can, watch carefully to see what moves with it. Does the belt move but the pulley doesn't turn? You have a loose belt. Does the pulley turn too? You have a loose pulley set screw. Does the entire gantry move with respect to the stationary rails? You have loose V-wheels or eccentric spacers. And so on. Repeat for back and forth movement, and up and down too, if that's also causing problems.

Remember that it's not easy to secure the pen. Before you go deeper, make sure it's not the pen that's wobbly. The result you see is consistent with a loosely attached pen, but also with a slack belt, or a loose pulley set screw.
Proud owner of ShapeOko #709, eShapeOko #0, and of store.amberspyglass.co.uk

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