Z axis rods screws

Topics around mechanical design, controller and electronics. Mods & hacks welcome.
Natasa
Posts: 5
Joined: Fri Mar 06, 2020 1:07 pm

Z axis rods screws

Postby Natasa » Fri Mar 06, 2020 1:22 pm

Hello everyone,
i have a question about my z rods screws (sorry i dont know how else to call them). i am reffering to the 4 screws with the square "metal part" that connects the z axis rods to the bedplate. (i hope you understand).
Mine are screw all the way. note i have send the printer over where i got it because of a noise i didn't like and when it came back it felt weird. since then i dont seen to get the bed leveled! i have tried multiple times but i still have differnces which i never used to have before. log story sort i ask around and some have told me that their screws are not tied all the way mine are but they have a little gap. i dont trust the shop i bought it to send it over again (EVER!) and i need to know if i have to loosen the screws or not.
Thank you in advance
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Vicky@Raise3D
Posts: 6495
Joined: Fri Mar 25, 2016 3:54 am

Re: Z axis rods screws

Postby Vicky@Raise3D » Sat Mar 07, 2020 12:19 am

Those screws are not supposed to be tighted. Please loosen them for a full turn and see whether the bed can move up and down smoother or not.

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

Re: Z axis rods screws

Postby Jetguy » Sat Mar 07, 2020 1:27 am

https://forum.raise3d.com/viewtopic.php?f=4&t=796
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

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

Re: Z axis rods screws

Postby Jetguy » Sat Mar 07, 2020 1:34 am

Also, might want to see this topic on bed leveling
https://forum.raise3d.com/viewtopic.php ... 09&p=51037

cowtownam wrote:Update:

I implemented the bed modification designed by TobyCWood (https://www.thingiverse.com/thing:1409412) & used some of gpvillamil's remix (https://www.thingiverse.com/thing:1992664) on one of my N2+ machines -- this is a game changer. I am now able to tram/level the bed in less than 60 seconds by moving the extruder head around freely and using the .02 feeler gauge to make minor quick turn adjustments on the wing nuts below the bed. It's a breeze to now switch between materials and different build plate surfaces in an efficient manner. No more messing with the z-offset switch. The bed is perfectly level across all 12 inches of the bed if you take your time and do it right when installing. The first layer quality is like when I first got the machine.

If you desire to print on straight glass without a raft, I highly recommend this modification. It's relatively cheap to implement and requires a couple of printed parts -- I did the spacers and wing nuts in ABS for it's good thermal/mechanical properties in this particular application. The stronger springs and longer flat head screws make this operation a breeze. My machines already had the v2 heat beds with the insulation so I opted for the oxidized washers for longer life and did not have to mess with any kapton tape application or printed washers.

I successfully ran 10 calibration prints covering the maximum build plate size with no layer adhesion issues or bed level issues. I am now on my 3rd 10+ hour long print. The first 2 were a success and very nice quality. If this third complex model finishes with no issues I am going to proceed with the modification on the other N2+ and my N2.

Natasa
Posts: 5
Joined: Fri Mar 06, 2020 1:07 pm

Re: Z axis rods screws

Postby Natasa » Sat Mar 07, 2020 10:10 am

i forgot to clarify that it's a pro 2 +
thank you for your responds!


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