cutting paths going wrong

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kiark82
Posts: 16
Joined: Tue Jul 29, 2014 7:26 pm

cutting paths going wrong

Post by kiark82 » Tue Aug 26, 2014 4:49 pm

hi

im havimg the followimg issue:

i was making some circle test cuts. i had a stepdown rate of 0.5 and was just trying to get through the material. after a few step down cycles the machine just went nuts and went right through the.middle or went oitside the circle... seems to happen competely random. as the z-axis was at -5 or something the material started to smoke

i will upload some pictures soon

edit: pics

Image

Image

Image

kiark

cvoinescu
Posts: 4442
Joined: Thu Jul 19, 2012 6:50 pm
Location: Camberley, UK
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Re: cutting paths going wrong

Post by cvoinescu » Tue Aug 26, 2014 9:38 pm

Your machine lost some steps.

This can happen if the current through the X and Y motors is too low, or if it's too high and caused the drivers to overheat and enter thermal shutdown.

It can also happen if your Z axis isn't perpendicular to the bed. If it's not square, the lower you dig into the material, the more the side of the tool digs into the stock; eventually, the force will be too much for the motors, and they'll lose steps.
Proud owner of ShapeOko #709, eShapeOko #0, and of store.amberspyglass.co.uk

Estlcam
Posts: 89
Joined: Tue Sep 10, 2013 3:13 pm
Location: Germany
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Re: cutting paths going wrong

Post by Estlcam » Tue Aug 26, 2014 10:38 pm

Hi,

besides lost steps: if the material starts smoking you either use far too high spindle rpm or a dull or generally unsuitable tool.

Christian
Estlcam CAM and Arduino UNO CNC controller: www.estlcam.com

aarvidsson
Posts: 150
Joined: Sat Aug 03, 2013 4:46 pm
Location: Frosty Sweden

Re: cutting paths going wrong

Post by aarvidsson » Wed Aug 27, 2014 6:04 am

I would add idler tightness to the above ideas. I've had issues where the idler wheel worked loose and I didn't notice since it is held tight by the belt. But suddenly the idler would move a bit and the machine would wander off similarly to yours.
ShapeOko 2 #4143

kiark82
Posts: 16
Joined: Tue Jul 29, 2014 7:26 pm

Re: cutting paths going wrong

Post by kiark82 » Wed Aug 27, 2014 9:11 pm

hi

thanks for the answer!

fortunately the problem was way more basic... the belt pulleys were not attached strong enough to the motor... they got lose pretty often and the screw popped out... now i glued them down ;)

kiark

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