Threaded rod screws very loose

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Helipilot
Posts: 142
Joined: Fri Aug 05, 2016 5:39 am
Location: SoCal.

Threaded rod screws very loose

Postby Helipilot » Sun Aug 14, 2016 7:58 pm

I've attached a pic of the screws that are super loose. Are they suppose to be like this as both sides are like this. All four each side.
Attachments
image.jpeg
Raise 3D N2 Dual purchased Aug 9th 2016

Jetguy
Posts: 3015
Joined: Tue Mar 22, 2016 1:40 am
Location: In a van, down by the river

Re: Threaded rod screws very loose

Postby Jetguy » Sun Aug 14, 2016 8:20 pm

They are supposed to be loose to prevent Z axis artifacts from the ballscrews.
Per the wiki/FAQ
http://www.raise3d.com/pages/faq#faq12
For N1, all nuts and screws should be tight, except 2 screws for Z axis. For N2 and N2+, only the 8 screws for Z axis (4 on each side) should be loose.

Helipilot
Posts: 142
Joined: Fri Aug 05, 2016 5:39 am
Location: SoCal.

Re: Threaded rod screws very loose

Postby Helipilot » Sun Aug 14, 2016 9:18 pm

Very cool. Thanks for clarifying.
Raise 3D N2 Dual purchased Aug 9th 2016

NewbPilot
Posts: 287
Joined: Tue Jul 26, 2016 2:16 am
Location: West Palm Beach, FL
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Re: Threaded rod screws very loose

Postby NewbPilot » Sun Feb 16, 2020 3:43 am

Jetguy wrote:They are supposed to be loose to prevent Z axis artifacts from the ballscrews.
Per the wiki/FAQ
http://www.raise3d.com/pages/faq#faq12
For N1, all nuts and screws should be tight, except 2 screws for Z axis. For N2 and N2+, only the 8 screws for Z axis (4 on each side) should be loose.


So after 3+ years, the thread rod screws are making noise when I do the z-hop on retraction. It never happened until today. Do i tighten them a bit? it's a "click click" noise for the down and up on the hop.

Jetguy
Posts: 3015
Joined: Tue Mar 22, 2016 1:40 am
Location: In a van, down by the river

Re: Threaded rod screws very loose

Postby Jetguy » Thu Feb 20, 2020 10:29 am

https://forum.raise3d.com/viewtopic.php ... ble#p46646

The factory original method of leaving the 4 each screws and nuts loose so the ballnuts can slide compared to the Z stage is not super effective at decoupling wobble.
#1 ensure your ballnut attachment screws and locknuts are intentionally loose. Also consider lubing or greasing the sliding point between the flange of the ballnut and the actual Z stage. (The factory method of anti-z wobble also leaves backlash when using Z hop)
#2 Consider alternatives to the loose bolt method.
https://forum.raise3d.com/viewtopic.php?f=5&t=9804
https://forum.raise3d.com/viewtopic.php ... ble#p33244


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