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Pulley screws too tight prevents proper operation  

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roc856
(@roc856)
Active Member
Pulley screws too tight prevents proper operation

pulley

I tightened the Y-axis pulley screws, and my printer then failed to operate. For example, the belt test resulted in Y-axis failure. (Not an out-of-range number, but flat out failure.)

(Note that the picture isn't the Y-axis motor -- I just wanted to show what I meant by pulley screws.)

Then I loosened the screws a little, leaving them snug but not apparently too tight, and the printer started to work again.

Why are too-tight screws a problem?

Posted : 27/10/2021 7:57 pm
BogdanH
(@bogdanh)
Honorable Member

That's the first time I hear that to be the case. Did you re-tighten screws with belt on, or did you readjust belt tension too?

[Mini+] [MK3S+BEAR]...
Posted : 28/10/2021 5:06 am
Dan Rogers
(@dan-rogers)
Noble Member
Yeah, that's not it

Print yourself a belt tension gauge.  You got something much bigger going on.  Unless you got the wrong pulley/shaft diameter a semi tight and very tight pulley are indistinguishable to the printer.  

Posted : 28/10/2021 5:44 am
roc856
(@roc856)
Active Member
Topic starter answered:
UPDATE

Belt on.

My theory is that when I tightened the set screws, I moved the pulley up against the motor, thereby interfering with free turning of the shaft. I loosened the screws, moved the pulley a bit away from the motor, and re-tightened. I think it's OK now.

Posted : 28/10/2021 3:35 pm
BogdanH
(@bogdanh)
Honorable Member

Thank you for clarifiying

[Mini+] [MK3S+BEAR]...
Posted : 28/10/2021 6:23 pm
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