Z-Axis making noise, running unevenly

stephenjbell
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Z-Axis making noise, running unevenly

Post by stephenjbell » Sun Dec 22, 2013 4:20 am

I'm having essentially the same problem as in this old thread: http://shapeoko.com/forum/viewtopic.php?f=10&t=1140 Should I try the things that are suggested there? Have there been significant enough changes to the Shapeoko 2 that the solution would be different?

I rolled the rod on the table as suggested in the assembly instructions, and it didn't seem crooked. Here's a video of what mine is currently doing:

http://www.youtube.com/watch?v=9xlzL4vSk2w

Thoughts?

Improbable Construct
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Re: Z-Axis making noise, running unevenly

Post by Improbable Construct » Sun Dec 22, 2013 4:35 am

From the sound of it your feed speed and/or acceleration is too high.
Try a setting about 10% of what it is currently and see if it makes a difference.
If that makes it better start going back up until you find a good speed.
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stephenjbell
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Re: Z-Axis making noise, running unevenly

Post by stephenjbell » Mon Dec 23, 2013 2:49 am

Thanks. I started off with something misaligned and assumed that was the problem, not realizing that I was just trying to jog it too quickly. Everything seems good now.

tdewitt274
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Re: Z-Axis making noise, running unevenly

Post by tdewitt274 » Sun Dec 29, 2013 2:42 am

The same problem as well. I've pulled apart the Z-axis a few times and it will work for a time or two. I initially checked the screw if it was straight, and then verified it was still straight when pulling it apart the second time.

I did as suggested in the previous post, and it worked fine for testing the Hello World. But resetting the machine for another time resulted in the sounds you hear in the other person's YouTube video.

It seems that the axis is binding, but I can't find where the problem lies. Along the way, some shavings have come from the plastic block. The motor also runs quite hot. The bottom nut on the Z-axis also tends to "slide down" as I attempt to jog the axis up and down. Could someone post a picture of what the top of the Z-axis looks like?

Thanks in advance!

Todd

EDIT: Here's a video of the issue: http://youtu.be/hMtY_lphVQE

stephenjbell
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Re: Z-Axis making noise, running unevenly

Post by stephenjbell » Sun Dec 29, 2013 6:26 am

Todd, read this discussion:

http://shapeoko.com/forum/viewtopic.php ... 395#p18175

I think some of the setup numbers for GBRL are incorrect. I've turned my $5 down to 600-700 and it has stopped causing problems. I hope you get it figured out before you bend something up like I did.

Halfdead
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Re: Z-Axis making noise, running unevenly

Post by Halfdead » Sun Dec 29, 2013 1:31 pm

tdewitt274 wrote:The same problem as well. I've pulled apart the Z-axis a few times and it will work for a time or two. I initially checked the screw if it was straight, and then verified it was still straight when pulling it apart the second time.

I did as suggested in the previous post, and it worked fine for testing the Hello World. But resetting the machine for another time resulted in the sounds you hear in the other person's YouTube video.

It seems that the axis is binding, but I can't find where the problem lies. Along the way, some shavings have come from the plastic block. The motor also runs quite hot. The bottom nut on the Z-axis also tends to "slide down" as I attempt to jog the axis up and down. Could someone post a picture of what the top of the Z-axis looks like?

Thanks in advance!

Todd

EDIT: Here's a video of the issue: http://youtu.be/hMtY_lphVQE

Looks like your Z axis acceleration or speed is too quick.

WillAdams
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Re: Z-Axis making noise, running unevenly

Post by WillAdams » Sun Dec 29, 2013 2:07 pm

I wonder if the intention wasn't to increase X and Y.
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tdewitt274
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Re: Z-Axis making noise, running unevenly

Post by tdewitt274 » Sun Dec 29, 2013 3:29 pm

Changing the $5 to 500 seems to have worked. I'm not getting the stutter while raising the Z. I'll give the new setting a try later today with a pen.

Thanks for the help! I can't wait to graduate from marker on paper to blade on foam!

tdewitt274
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Re: Z-Axis making noise, running unevenly

Post by tdewitt274 » Sun Dec 29, 2013 4:19 pm

OK, couldn't wait.

The tests went without incident. For reference, the values are $4=500 and $5=500.

Here's a video of the results. http://youtu.be/CBY-wh6J5d0
The Sharpie is a little messed up due to earlier issues of the Z going too far down (I'll ask those questions later). I also tightened up the wheels from the first test to get rid of some of the play when raising/lowering.

One question I do have is the raise of the pen after finishing the letter. Shouldn't the raise be higher? I'm not concerned, so long as it is able to compensate for 3D printing. I'm sure this is a GCode setting.

I appreciate all the help!

Thanks

Todd

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Re: Z-Axis making noise, running unevenly

Post by WillAdams » Sun Dec 29, 2013 6:36 pm

tdewitt274 wrote: One question I do have is the raise of the pen after finishing the letter. Shouldn't the raise be higher? I'm not concerned, so long as it is able to compensate for 3D printing. I'm sure this is a GCode setting.
It's the last lines in the file:

Code: Select all

G0 Z0.125 <-- rapid lifts to 0.125in above zero
M5
M30
Shapeoko 3XL #0006 w/Makita RT0701 Router w/0.125″ and ¼″ Elaire precision collets
Nomad 883 Pro #596 (bamboo)

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