Horizontal waves problem

Hardware issues, problems and solutions
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Vadym
Newbie
Newbie
Posts: 3

Horizontal waves problem

Post#1 » Wed Nov 08, 2017 3:35 pm

Hi guys.

I have B9 v 1.1
I have problem that I just can't solve. My build table seems to refuse rise evenly. I can't explain it other way.
On tilted surfaces (not perpendicular to build table) I always get periodical waves with a high that is very similar to Z-screw period (1.27 mm). I can't tell exactly but it looks very similar.
I attach image that displays that (Let's imagine gray ground is build table). Surfaces that are perpendicular to build table come out perfectly flat.

waves_problem.jpg


I have no ideas about what I can do.
Z-screw seems to be straight, I don't see any wobbling.
Everything seems to be assembled pretty tight. Nothing wobbles/moves.
Also, when detached, build table moves up and down very smoothly, so the friction is not the problem.
I think Z-motor may rotate unevenly, but I replaced it once and still have this issue.

Is there any way to calibrate uniformity of Z-screw rotation? I think that may do the trick.
Or do you have any other ideas?

That problem is very annoying and makes me refuse of using B9 sometimes, when these waves are too hard to eliminate.

PS I made 3d picture because I have no good camera with macro... Sorry

Aaron RMW
B9 Maker
B9 Maker
Posts: 133

Re: Horizontal waves problem

Post#2 » Thu Nov 09, 2017 8:45 am

there are macro lenses that clip on to your cell phone for $10 or less

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Metalcaster
B9 Wizard
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Re: Horizontal waves problem

Post#3 » Thu Nov 09, 2017 10:45 am

You may want to put oil on the rods and the Z screw... But, I suspect something is out of alignment... It will be either left or right alignment of the projector or front to back.
If you turn the piece you are printing, where are the lines now.
Put 1 piece in 1 direction and the other piece at a right angle(or left angle)
then compare where the lines are.
This will show you if the projector is out of alignment.

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Vadym
Newbie
Newbie
Posts: 3

Re: Horizontal waves problem

Post#4 » Thu Nov 09, 2017 2:01 pm

Good news everyone

Looks like I found the solution.
Buy the way, it doesn't depends on orientation at all.

The problem was vertical movement of Z-screw.
Seems like miniature ball bearing and shaft collar clamp were causing z-axis vertical movement while rotating.
5.jpg


So I removed them from the bottom of the screw and everything became much better now. Also I've moved a bit down upper shaft collar clamp.
Now Z-screw has a backlash, but who cares? :D

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