1 Topic by aaronstalling

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Topic: Is it normal for my y axis pulley to move like this?

This is what happens to my left pulley when I move my y carriage back and forth, the right pulley stays perfectly aligned.
http://youtu.be/P-xJKpSsVdY

It will move along the shaft up to 2mm and the front idler moves accordingly.

Are my tensions out?
Is this normal?
Is my shaft bent?

2 Reply by Serin

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Re: Is it normal for my y axis pulley to move like this?

Best be doing the Y calibration.
Check out this clip, its surprisingly helpful.

http://vimeo.com/55031028

This is a crowd funding thing that I'm running: http://www.gofundme.com/bvi140 It's for pretty selfish reasons tongue

3 Reply by aaronstalling

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Re: Is it normal for my y axis pulley to move like this?

Serin wrote:

Best be doing the Y calibration.
Check out this clip, its surprisingly helpful.

http://vimeo.com/55031028

I have done this so many times without any improvement. I then installed the pillow blocks, this had minimal improvement.

4 Reply by n2ri

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Re: Is it normal for my y axis pulley to move like this?

looks like a set screw is loose letting pulling thread back and forth on shaft from scarring

Solidoodle 2 with Deluxe kit cover & glass bed with heater. and 2nd board SD2 used not 3rd and alum platform not installed yet still wood. also need cooling fan installed to board. use Repetier Host couple vers. Slic3r also have all free ware STL programs

5 Reply by aaronstalling

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Re: Is it normal for my y axis pulley to move like this?

n2ri wrote:

looks like a set screw is loose letting pulling thread back and forth on shaft from scarring

I did loosen the screw, the video is of. Me performing the process from the above video. Is that what you mean?

6 Reply by n2ri

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Re: Is it normal for my y axis pulley to move like this?

aaronstalling wrote:

This is what happens to my left pulley when I move my y carriage back and forth, the right pulley stays perfectly aligned.
http://youtu.be/P-xJKpSsVdY

It will move along the shaft up to 2mm and the front idler moves accordingly.

Are my tensions out?
Is this normal?
Is my shaft bent?


this video shows pulley drifting a few MM back and forth on shaft due to loose set screw "threading' on scored shaft. seen this on many types of shafts some much worse. may need to smooth any scars on shaft and make a flat spot for set screw to seat into b4 screw splits/strips pulley out from over tighting. thats what keyways are for on shafts.

Solidoodle 2 with Deluxe kit cover & glass bed with heater. and 2nd board SD2 used not 3rd and alum platform not installed yet still wood. also need cooling fan installed to board. use Repetier Host couple vers. Slic3r also have all free ware STL programs

7 Reply by n2ri

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Re: Is it normal for my y axis pulley to move like this?

the calibration video dont say anything about how the tension adjustments on belts can cause the left/right belts to get out of time/clock with each other. as they are after all timing belts with cogs in pulleys and both must be exactly the same to prevent them trying to twist a bit when moving putting a bind on the carriages  so when adjusting tension of belts best have pulleys loose on shaft so they sit even. then tighten pulley set screws. need some mechanical skills along with technical on these printers. another thing to look at causing the movement is the belts where tension adjust screw is may just be twisted a bit instead of square with belts since they kind of hook through belt with some slack. thats why pulleys get tightened between fron/rear movement trying to find center of belt travel and carriage connection screw while keeping shaft centered in its bearings.

Mitch

Mitch

Solidoodle 2 with Deluxe kit cover & glass bed with heater. and 2nd board SD2 used not 3rd and alum platform not installed yet still wood. also need cooling fan installed to board. use Repetier Host couple vers. Slic3r also have all free ware STL programs