"thunk" sound along the Y axis

roboterkampf
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"thunk" sound along the Y axis

Postby roboterkampf » Sat May 18, 2019 12:30 am

I have an N2+. At the last 20 minutes of an 80 hour print (doesn't it figure!) I had a fail - everything shifted/smushed to one side along the Y axis. Chalked it up to Murphy's law, sliced the missing sliver off the .stl and ran it thinking "I'll just weld it together, no problem"... and the sliver did the same thing. So I thought "maybe I need to grease the rails again" and did that..... and in moving the heads around, I noticed a definite "thunk" sound along the Y axis. Not random, and localized to one spot... unless I change the velocity in how I move the head along the rail, and then I can make the "thunk" travel closer or farther away... so are we all thinking it's a bearing somewhere? The sensation is one of the resistance changing/sliding when the "thunk" happens, so it *has* to be the culprit, yeah?

It's three years old now, and I have used it a LOT.

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Vicky@Raise3D
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Re: "thunk" sound along the Y axis

Postby Vicky@Raise3D » Sat May 18, 2019 12:34 am

Not sure the noise you mentioned is from where. But if you can hear abnormal noise when trying to move print head, I would recommend check coupler first.
Attached two instructions about coupler for you to understand where the couplers are located at.
https://support.raise3d.com/pro2-series ... ent_id=685
https://support.raise3d.com/pro2-series ... ent_id=676

roboterkampf
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Re: "thunk" sound along the Y axis

Postby roboterkampf » Sat May 18, 2019 12:45 am

Also, I tried to home it multiple times - Homes to X just fine, does nothing with the Y axis.

roboterkampf
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Re: "thunk" sound along the Y axis

Postby roboterkampf » Sat May 18, 2019 12:46 am

Thanks for the tip - what would I be looking for on the coupler?

roboterkampf
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Re: "thunk" sound along the Y axis

Postby roboterkampf » Sat May 18, 2019 12:53 am


roboterkampf
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Re: "thunk" sound along the Y axis

Postby roboterkampf » Mon May 20, 2019 5:32 pm

Any theories, gang?

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Vicky@Raise3D
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Re: "thunk" sound along the Y axis

Postby Vicky@Raise3D » Mon May 20, 2019 6:12 pm

Please check whether coupler is damaged or not. Sometimes it may only have a slight crack.
1.png

And please also check whether the motor rod is following the movement of coupler or not when you move the print head. It may get loose sometimes. Or you can reinstall the coupler based the instructions attached.
https://support.raise3d.com/pro2-series ... ent_id=676
https://support.raise3d.com/pro2-series ... ent_id=685

roboterkampf
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Re: "thunk" sound along the Y axis

Postby roboterkampf » Mon May 20, 2019 9:29 pm

Ahh, I see what you are thinking. I'll dig in and inspect the coupler, and check to see if it is fully engaged to the rod.

roboterkampf
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Re: "thunk" sound along the Y axis

Postby roboterkampf » Sat May 25, 2019 5:36 pm

Yep - coupler snapped in that same spot. How do I go about getting a replacement? I’d like to replace both while I have it semi-stripped down.

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ocelot27
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Re: "thunk" sound along the Y axis

Postby ocelot27 » Sun May 26, 2019 4:10 pm

More importantly why are these things failing left and right?

Jetguy
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Re: "thunk" sound along the Y axis

Postby Jetguy » Sun May 26, 2019 9:03 pm

ocelot27 wrote:More importantly why are these things failing left and right?


Simple, motor to shaft alignment. The motor is mounted using a Z shaped bracket with plenty of room for variable alignment and only held with friction from the screws. You ship and jostle around a printer put together in China, shipped across the ocean, handled by local couriers and then wonder how a decently heavy motor could become misaligned to a shaft causing flexing of the coupler and eventual fatigue failure. Then user installs a new one with no understanding of shaft alignment and then wonders why it fails too. You don't have to search too far in the hardware forum using keywords like "coupler" to find countless users entering this failure cycle and "wondering".

https://www.youtube.com/watch?v=MXAsKFnCqUE

Alternatives and fixes:
#1 align the shafts when installing a new coupler or first getting a printer in a new location. This is not something easily taught in a forum post or instructions. You probably aren't taking the machine apart to the level you have the visual and mechanical clearance and ability to measure such a small gap and get the motor into perfect alignment using dial indicators as used in much larger industrial situations. Ultimately, what you more or less end up doing is attaching the coupler, keeping the mounting screws of the motor bracket loose, then actively rotate the shaft by moving the carriage while aligning and tightening the final mount screws. Depending on a person's skill and basic understanding results either in good or bad alignment- hence the failures and repeated failures.

#2 Add rubber isolating mounts to the motor to further aid in self alignment and reduce noise and dampening even further.
Posted previously here https://forum.raise3d.com/viewtopic.php ... ner#p14240


#3 consider using a different 3 jaw "Lovejoy" style with polymer connection ring that tolerates errors slightly better than the spiral cut style coupler. Note, due to the larger diameter, I found that slight clearancing on the frame was required to allow the common commercially available coupler.
https://forum.raise3d.com/viewtopic.php ... joy#p11666

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Vicky@Raise3D
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Re: "thunk" sound along the Y axis

Postby Vicky@Raise3D » Tue May 28, 2019 6:54 pm

roboterkampf wrote:Yep - coupler snapped in that same spot. How do I go about getting a replacement? I’d like to replace both while I have it semi-stripped down.


You can open a support ticket at http://help.raise3d.com with your printer information and picture of your broken coupler to contact our support team to help you get a new coupler to replace your current one.

roboterkampf
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Re: "thunk" sound along the Y axis

Postby roboterkampf » Wed May 29, 2019 1:20 pm

Will do. I’d like to replace both assuming fatigue will take the other one down too

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ocelot27
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Re: "thunk" sound along the Y axis

Postby ocelot27 » Wed May 29, 2019 1:50 pm

Ug.


Jetguy wrote:
ocelot27 wrote:More importantly why are these things failing left and right?


Simple, motor to shaft alignment. The motor is mounted using a Z shaped bracket with plenty of room for variable alignment and only held with friction from the screws. You ship and jostle around a printer put together in China, shipped across the ocean, handled by local couriers and then wonder how a decently heavy motor could become misaligned to a shaft causing flexing of the coupler and eventual fatigue failure. Then user installs a new one with no understanding of shaft alignment and then wonders why it fails too. You don't have to search too far in the hardware forum using keywords like "coupler" to find countless users entering this failure cycle and "wondering".

https://www.youtube.com/watch?v=MXAsKFnCqUE

Alternatives and fixes:
#1 align the shafts when installing a new coupler or first getting a printer in a new location. This is not something easily taught in a forum post or instructions. You probably aren't taking the machine apart to the level you have the visual and mechanical clearance and ability to measure such a small gap and get the motor into perfect alignment using dial indicators as used in much larger industrial situations. Ultimately, what you more or less end up doing is attaching the coupler, keeping the mounting screws of the motor bracket loose, then actively rotate the shaft by moving the carriage while aligning and tightening the final mount screws. Depending on a person's skill and basic understanding results either in good or bad alignment- hence the failures and repeated failures.

#2 Add rubber isolating mounts to the motor to further aid in self alignment and reduce noise and dampening even further.
Posted previously here https://forum.raise3d.com/viewtopic.php ... ner#p14240


#3 consider using a different 3 jaw "Lovejoy" style with polymer connection ring that tolerates errors slightly better than the spiral cut style coupler. Note, due to the larger diameter, I found that slight clearancing on the frame was required to allow the common commercially available coupler.
https://forum.raise3d.com/viewtopic.php ... joy#p11666

DeX
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Re: "thunk" sound along the Y axis

Postby DeX » Tue Jun 18, 2019 3:05 am

Надо ли мне отправлять принтер с такой поломкой в город за 700км для диагностики, чтобы заменить муфту по гарантии. Да в принтере ещё что-нибудь сломается за это время! Господа, американцы, у вас какие расстояния между городов? :)
Sad. I just will buy it.


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