Z axis can't goes up or down+Abnormal movement

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Admin
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Joined: Wed Nov 30, 2011 9:49 am

Z axis can't goes up or down+Abnormal movement

Post by Admin » Tue Mar 20, 2018 3:37 pm

If you find Z axis can't move after you assemble your printer, you can refer to this.

I suggest you take off the threaded rods, then move Z axis from LCD.
If one motor jams, you can swap two Z-axis motor cable connector on the main board, check whether the problem will change from one motor to another motor.
If two motors jam, I suggest you swap Z-axis driver with a good-working driver.
If two motors can work well, I have some tips for you.
1. Please remove the smooth rods and the thread rods on a table and check if they are bent].
If the rod is not bent,
You can add lubricating oil for the rod

2. Please tighten the screws of the coupling. The correct mount way:
联轴器.png
联轴器.png (404.27 KiB) Viewed 7495 times

3. The left Z-axis height should be same as the right Z axis. And you can refer to this post.
http://www.geeetech.com/forum/viewtopi ... 917(thanks

4. Maybe the A4988 of Z-axis has not enough power to drive the motor. And you should increase the voltage of A4988. you can refer to this post.
http://www.geeetech.com/forum/viewtopic ... 7&t=17038
ADJUST.png
ADJUST.png (206.02 KiB) Viewed 7493 times

5. You should loose the Z brass nut a little.
CatchBAA7(02-06-(03-20-11-07-19).jpg
CatchBAA7(02-06-(03-20-11-07-19).jpg (318.26 KiB) Viewed 8170 times

6. Check this area(Linear Bearing:LMH8LUU)
Please do not tighten the screws too tightly
Liner1.jpg
Liner1.jpg (271.75 KiB) Viewed 7495 times
liner2.jpg
liner2.jpg (231.99 KiB) Viewed 7495 times

7. Check the thread rod type of Z axis
For T8 rod.You can send Gcode"M92 Z400" and then send"M500" to save the setting
T8.jpg
T8.jpg (16.99 KiB) Viewed 7497 times
For M8 rod. You can upload the official firmware directly

8.You can use a file to polish this hole in the i3-08 part
I3-08.png
I3-08.png (545 KiB) Viewed 6441 times

wthile
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Joined: Sat Mar 10, 2018 3:36 am

Re: Z axis does not go up or down.

Post by wthile » Wed Mar 21, 2018 2:09 am

if you losen the "yellow" nut would that not cause Z axis wobble?

wthile
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Joined: Sat Mar 10, 2018 3:36 am

Re: Z axis does not go up or down.

Post by wthile » Wed Mar 21, 2018 11:02 pm

I followed these instructions and this worked well. I used synthetic gun lube on the threaded rods and all works well now. I have another problem but I will create another post for that.

LenFischer
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Joined: Sun Apr 01, 2018 11:41 pm

Re: Z axis does not go up or down.

Post by LenFischer » Sun Apr 01, 2018 11:54 pm

I had problems with my z axis not moving right after my build. It seemed to be a combination of the threaded rods not moving smoothly, and the motors and shafts not being properly aligned. I solved the first problem by removing the threaded rods, spraying them down with WD-40, and running them through the threaded z-axis nut repeatedly until they moved smoothly. I solved the second problem by raising the couplings for the threaded rods so there is approximately a 1 cm gap between the top of the stepper motors and the bottom of the coupling. This solved it for me.

RaySkye
Posts: 5
Joined: Tue Sep 04, 2018 3:10 am

Re: Z axis can't goes up or down+Abnormal movement

Post by RaySkye » Tue Sep 04, 2018 3:17 am

I am having this issue but it appears that the upper brackets (Part i3-08) is pushing the rods out of alignment. How do I go about getting replacements for this part? I have a feeling that the ones I have are slightly off.

I will try the steps in this thread and let you know the outcome.

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William
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Re: Z axis can't goes up or down+Abnormal movement

Post by William » Tue Sep 04, 2018 9:55 am

RaySkye wrote:
Tue Sep 04, 2018 3:17 am
I am having this issue but it appears that the upper brackets (Part i3-08) is pushing the rods out of alignment. How do I go about getting replacements for this part? I have a feeling that the ones I have are slightly off.

I will try the steps in this thread and let you know the outcome.
You can contact the technical@geeetech.com
to send you the stl files for I3-08
-Keep your mind and try to test it. :)
-Everything will be fun!-Support all Getech printer.
-You can ask me the questions and I will kindly reply.
-Respect others is the best way you can get help!

RaySkye
Posts: 5
Joined: Tue Sep 04, 2018 3:10 am

Re: Z axis can't goes up or down+Abnormal movement

Post by RaySkye » Tue Sep 04, 2018 9:57 pm

William wrote:
Tue Sep 04, 2018 9:55 am
You can contact the technical@geeetech.com
to send you the stl files for I3-08
This solution would not have helped since I was not able to print.

I was able to partially resolve the issue with lubrication though.

I have to be very careful at the start of my prints since the Z axis has a tendency to un-sync and bind. Once it starts it is pretty decent.

Now I just have to figure out how to get the layers to actually stick instead of flaking off. That is an issue for a different topic though.

RaySkye
Posts: 5
Joined: Tue Sep 04, 2018 3:10 am

Re: Z axis can't goes up or down+Abnormal movement

Post by RaySkye » Thu Sep 13, 2018 7:55 am

Resolved the issues. Turns out there was a stripped nut on the left brass nut. It caused the rod to bend to the right and out of alignment. I was able to remove the nut (the hole is wrecked) and adjust the remaining bolts so everything is aligned now.

If someone else runs into this problem it might be a good idea for them to start with the alignment and work out from there.

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