Belt tensioning

khauser24
Posts: 30
Joined: Mon Dec 01, 2014 12:41 am

Re: Belt tensioning

Post by khauser24 » Thu Jan 29, 2015 10:19 pm

Could you, as I had done, have put the screws for the steppers in backwards? On some of the positions the screw needs to be on the side of the plate facing in towards the makerslide, with washer and nut on the outer side, else the screw goes too far and makes contact with the maker slide. If you are seeing aluminum bits on the scrap board that's an indication that you're seeing that problem...

Hans
Posts: 290
Joined: Tue Dec 25, 2012 5:19 am
Location: Connecticut, USA

Re: Belt tensioning

Post by Hans » Fri Jan 30, 2015 3:20 pm

PGBcustoms, the two common causes of timing belts tracking poorly are misaligned pulleys/idlers and uneven tension across the width of the belt, neither of which we have much control over. In general though, if the belt doesn't look like it's going to rub itself to death on the pulley flange, and it doesn't look like it's stretched on one side and loose on the other, you can ignore it. Belt tracking alone won't affect your accuracy.
Shapeoko #1,123

Caesar S
Posts: 197
Joined: Mon Sep 29, 2014 7:19 pm
Location: Seattle, WA

Re: Belt tensioning

Post by Caesar S » Fri Jan 30, 2015 4:21 pm

Another possibility is the pulley skipping teeth, which would feel like a consistent hammer, observe the belt on the pulley. If so, tensioning the belt might be a solution.

It could also be the stepper motor skipping steps, you can feel this by holding the stepper motor while it's moving. If so, you might have to increase current slowly (don't go past the top).

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