Ultimaker is Stuttering and the Y axis belt slips

[matthiash 0]

Hello,

I just finished building my ultimaker,

My y axis is not working right, the bearing is slipping in the belt.

The screws are already very tight on both sides.

Any ideas what I can do to solve this problem?

 

[illuminarti 18]

Do you mean that the pulley is slipping on the shaft?

If so, tighten the pulley more. :-)

If your kit came with a spare bag of set screws for the pulleys, try using those instead - sometimes the standard might not grip as well.

 

[matthiash 0]

I was talking about the pulley not the bearing it slips in the belt, tried a couple of things, but it does not work yet

 

[illuminarti 18]

To be clear: is the belt slipping relative to the pulley. Or the pulley slipping relative to the axis rod that it is on?

If the belt is very loose - have you made sure that the belt is properly routed through the sliding block, and tensioned by tightening the screw on the sliding block, so that it grips the belt tightly?

Sometimes people need to add tensioners to take up some slack in the belt to get better results. But it shouldn't be so bad that the belt slips over the pulley totally.

Perhaps you could add some photos to your gallery (click your name in the top right corner of the screen, then go to My Gallery from the menu that appears) and then add them to your posts in this thread using the 'My Media' link in the post editor? That way we can see what is going on.

 

[IRobertI 520]

Do you mean that the belt isn't getting gripped by the pulley so that it's slipping over the groves? Probably a stupid question but have you checked to see that the belt or pulley isn't damaged in some way and that the grooves in the pulley are clean?

Also, what is the belt tension like? If you push the head to a corner and then pluck on the belt like you were playing a guitar, does it give off a bit of a "pong"? If the belt is very slack I imagine it could slip and would need to be tensioned. It shouldn't be that way from the start though, if it is there's something wrong with it.

Here's a video showing what the tension should be like:

 

 

[matthiash 0]

The pulley is slipping relative to the belt, not permanently but if it is going faster.

The belt tightener is already at its maximum.

 

[gr5 2,176]

Can you post a few photos of both ends of the belt and the sliding block? Something sounds seriously wrong. Or maybe your belt is defective. Did you watch the above video yet?

[matthiash 0]

Thanks for your help, I added a belt tensioner and no it seems to work.

Cheers,

Matthias