What am I doing wrong?

[my07ultra]

I'm using a S3 XXL when I try to cut a circle it doesn't come out concentric. Any suggestions? I've tightened belts, rollers and calibrated my servos... I'm at a loss for what else it can be. Cut it at 70% federate too, but nothing seems to help. Thanks in advance.







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[my07ultra]

I'm using a S3 XXL when I try to cut a circle it doesn't come out concentric. Any suggestions? I've tightened belts, rollers and calibrated my servos... I'm at a loss for what else it can be. Cut it at 70% federate too, but nothing seems to help. Thanks in advance.







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Here's another picture, a little closer



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[WillAdams]

When cutting, there are a number of things which influence how the machine cuts:

- belt tension --- this is tricky to get right at first: https://www.shapeoko.com/wiki/index.php ... ko_3#Belts
- pulley set screws --- http://docs.carbide3d.com/article/169-s ... set-screws
- speeds and feeds --- http://carbide3d.com/shapeoko/feedandspeed/ (and esp. plunge rate and depth of cut)
- climb vs. conventional cutting --- https://www.shapeoko.com/wiki/index.php ... al_Milling (esp. in combination w/ a roughing clearance and finishing pass)

The perfect cutting is not too slow, not too fast, not too shallow and not too deep. http://www.shapeoko.com/forum/memberlis ... file&u=760

https://www.shapeoko.com/wiki/index.php/Materials

[HPGreyling]

I think runout and feedspeed has a role to play here. When the bit enters the material it is at the spot as programmed but due to maybe high feed and slack belt tension the bit get " deflected" and pulls away from the original path. When the end meets the start the photos are the result.

[my07ultra]

When cutting, there are a number of things which influence how the machine cuts:

- belt tension --- this is tricky to get right at first: https://www.shapeoko.com/wiki/index.php ... ko_3#Belts
- pulley set screws --- http://docs.carbide3d.com/article/169-s ... set-screws
- speeds and feeds --- http://carbide3d.com/shapeoko/feedandspeed/ (and esp. plunge rate and depth of cut)
- climb vs. conventional cutting --- https://www.shapeoko.com/wiki/index.php ... al_Milling (esp. in combination w/ a roughing clearance and finishing pass)

The perfect cutting is not too slow, not too fast, not too shallow and not too deep. http://www.shapeoko.com/forum/memberlis ... file&u=760

https://www.shapeoko.com/wiki/index.php/Materials

I found both Y axis pulleys loose, also getting some chatter from one of the Y axis drive units... not sure what it's from, but I'm sure it's not helping anything.


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[WillAdams]

The motors will sometimes shudder if one moves them manually 'cause of generated current generating a pulse.

Sometimes when jogging by holding down a button in CM3 and earlier w/ Grbl 0.9 there will be a pause or hesitation --- hopefully this is fixed in the new CM4 and Grbl 1.1 (the former is in open beta testing now).