y axis slipping?

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dobart
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Re: y axis slipping?

Post by dobart » Tue Mar 14, 2017 5:35 am

Hi Ednisely, I did one at 1/10 the acceleration. it errored out as described above.

Changing to 'full honeycomb' made the error only appear at the transition from solid base layers to fill; not good enough to print anything with but a change nonetheless.

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ednisley
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Re: y axis slipping?

Post by ednisley » Tue Mar 14, 2017 4:31 pm

dobart wrote:did one at 1/10 the acceleration. it errored out as described above.
The reason I recommend backing off by a factor of 100 was to eliminate acceleration from the list of problems. A factor of 10 won't do that.

Remember to change the acceleration, not the speed, for the tests.

dobart
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Re: y axis slipping?

Post by dobart » Thu Mar 16, 2017 1:51 am

ah, 1/100; will do- at 1/10 the print is already all bugged out due to overextrusion on the corners, not looking forward to what happens with that. Making the changes in starting script, M201 X & Y, M202 X & Y, M204 S.

If acceleration turns out to be the problem, what should I do about it? I've loosened the motor mount bolts and taken the belt off the pulley to check motion and retensioned the belt and examined it all for wear or shavings.

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ednisley
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Re: y axis slipping?

Post by ednisley » Fri Mar 17, 2017 1:07 am

dobart wrote:M201 X & Y, M202 X & Y, M204 S
Change it only for the Y axis, because that's the one having the problem. Leave the others unchanged; Marlin will adjust their acceleration downward to match the Y axis values.
If acceleration turns out to be the problem, what should I do about it?
The fundamental problem is that the motor can't provide enough torque to move the axis. The most likely causes that fit the symptoms you've described are a collision with the already-printed plastic on the platform or too-high acceleration for the mass of the platform. If there are no collisions, then dramatically reducing the acceleration will ensure the motor has enough torque to move the platform.

So, this is a way to collect the data needed to rule out one possible set of problems.

dobart
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Joined: Wed Feb 15, 2017 1:46 am

Re: y axis slipping?

Post by dobart » Tue Apr 04, 2017 3:10 pm

Run thru a bunch of stuff with the service department after they got back to me; switched motors, cables, ran some gcode tests etc.

They're sending me a box so I can send it back.

:(

Doc
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Re: y axis slipping?

Post by Doc » Thu Apr 20, 2017 11:02 pm

What Program are you using to print?
Simplify3D will default to a print speed that that is too high and will cause that kind of slippage. Try decreasing your speed by half just to see what happens.

ketil
Posts: 31
Joined: Wed Apr 09, 2014 9:58 pm

Re: y axis slipping?

Post by ketil » Sun Apr 23, 2017 10:27 am

I'm getting skips/slips on the X axis only, and only for moves. I've tried slowing down moves from 300mm/s to 200mm/s, without success. So I've been greasing and debugging and trying various things, and now I think there may be an issue with my X carriage, or at least the bearings in the X carriage. I ran these gcode scripts and filmed the result, it's clear from the noise that there's something unfortunate going on with my X axis:

https://www.youtube.com/watch?v=2Fv61coeCX8


Gcode to test X-axis:

Code: Select all

G28 X0 ; home X
G1 X0 F10800 ; home X axis
G1 X200 F18000
G1 X20 F18000
G1 X200 F18000
G1 X20 F18000
G1 X200 F18000
G1 X20 F18000
G1 X200 F18000
G1 X20 F18000
G1 X200 F18000
G1 X20 F18000
G1 X200 F18000
G1 X20 F18000
G1 X200 F18000
G1 X20 F18000
G1 X200 F18000
G1 X20 F18000
G1 X200 F18000
G1 X20 F18000
G1 X200 F18000
G1 X20 F18000
G1 X200 F18000
G1 X20 F18000
Gcode to test Y-axis:

Code: Select all

G28 Y0 ; home X
G1 Y0 F10800 ; home X axis
G1 Y200 F18000
G1 Y20 F18000
G1 Y200 F18000
G1 Y20 F18000
G1 Y200 F18000
G1 Y20 F18000
G1 Y200 F18000
G1 Y20 F18000
G1 Y200 F18000
G1 Y20 F18000
G1 Y200 F18000
G1 Y20 F18000
G1 Y200 F18000
G1 Y20 F18000
G1 Y200 F18000
G1 Y20 F18000
G1 Y200 F18000
G1 Y20 F18000
G1 Y200 F18000
G1 Y20 F18000
G1 Y200 F18000
G1 Y20 F18000
Has anyone tried taking the X carriage off to clean it? Or clean the bearings? Does the carriage have a part number so I can order a replacement? I'm located in Norway, so shipping costs from Makergear have been prohibitive...

Edit: I've had my M2 since November 2012, and I've printed on it without much issue since then. This issue arose a couple of months back, but I didn't have time to debug further then, and the printer has been on the shelf since. I've never had anything like this before, and I have a second M2 that prints without a hitch. So I like to think we can rule out newbie and software issues. :)
Last edited by ketil on Sun Apr 23, 2017 6:13 pm, edited 1 time in total.

ketil
Posts: 31
Joined: Wed Apr 09, 2014 9:58 pm

Re: y axis slipping?

Post by ketil » Sun Apr 23, 2017 10:59 am

I found replacement carriages on the Makergear website. Reading this I realize that I should perhaps be careful about removing the X carriage from the rail to clean it, as the individual bearings wll probably come out:

https://www.makergear.com/products/carriage

If anyone has any idea what the right procedure would be to take this off, clean everything and put it back together again, I'd appreciate it. I have access to an ultrasonic cleaner.

Also, reducing non-printable moves from 300mm/s to 100mm/s (18000mm/min to 6000mm/min) is a functional workaround, I'm not getting skips with this speed.

ketil
Posts: 31
Joined: Wed Apr 09, 2014 9:58 pm

Re: y axis slipping?

Post by ketil » Sun Apr 23, 2017 11:50 am

I've also cleaned the X idler and lubricated it with the black grease. I still get the same noise from the test gcode, and I can feel unevenness in the axis when simply pusing the carriage back and forth with my fingers.

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