stange Z movement

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sonra
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stange Z movement

Post by sonra » Sun Oct 04, 2020 5:49 pm

Hi guys
I have an M2 printer from old style ( silver motor and z home switch in upper position of printer < when i try to print today the bed start to go up suddenly it began to go up and down rvery few seconds . Try to reset the printer( power down-up) did not help .I suppose it is an hardware problem (controller board ?) but before iI begin to do any thing may be it some thing other ? I use Simplify software as slicer
regards Doron

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ednisley
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Re: stange Z movement

Post by ednisley » Sun Oct 04, 2020 7:40 pm

sonra wrote:
Sun Oct 04, 2020 5:49 pm
start to go up suddenly it began to go up and down rvery few seconds
It's time to clean & lubricate the guide rods and leadscrew: they're now dirty enough to stall the underpowered Z-axis motor.

AFAICT, the right time to clean & lube is when the motor stalls, rather than pretending to do regular maintenance. [grin]

sonra
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Location: Israel

Re: stange Z movement

Post by sonra » Mon Oct 05, 2020 2:39 pm

hi Ed
thanks for help Try to clean with alcohol and lab . also increase the Z axis offset ( I notice that the problem some time accord during print cycle)

Doron

sonra
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Re: stange Z movement

Post by sonra » Mon Oct 05, 2020 3:37 pm

Hi
the problem is not solved. In middle of print it happen
Doron

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ednisley
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Re: stange Z movement

Post by ednisley » Mon Oct 05, 2020 11:34 pm

sonra wrote:
Mon Oct 05, 2020 2:39 pm
Try to clean with alcohol and lab
With the power off, unplug the motor and turn the leadscrew by hand (well, fingers) to move the platform from top to bottom and back again. I think you'll find some sections, probably in the middle of the travel, will require much more effort than others. Concentrate your cleaning in those areas until the platform moves smoothly with more-or-less equal effort over the entire leadscrew.

The old-old high resistance Z axis motor is marginal, at best, and your well-worn M2 may require more torque than it can produce. Upgrading to the correct motor will dramatically improve the performance.

More details:

https://softsolder.com/2013/04/10/maker ... per-motor/

https://softsolder.com/2013/04/11/maker ... s-numbers/

https://softsolder.com/2013/06/28/maker ... ransplant/

Because we live in the future, motors with T8 integrated leadscrews are now cheap & readily available:

https://www.amazon.com/s?k=stepper+17+leadscrew

Amazon may not be the right choice for you, but those motors+leadscrews should give you an idea of what to get.

sonra
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Location: Israel

Re: stange Z movement

Post by sonra » Tue Oct 06, 2020 5:37 pm

Hi
I add a short video to show what happens after Z_HOME command
https://youtu.be/n_5bptTtbRE
I try to strengthen the plugs but nothing changed
Doron

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ednisley
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Re: stange Z movement

Post by ednisley » Wed Oct 07, 2020 12:44 pm

sonra wrote:
Tue Oct 06, 2020 5:37 pm
a short video
If you can move the platform smoothly from bottom to top with just finger torque on the leadscrew, then replace the motor.

For conclusive proof, remove the four screws holding the Z-axis follower nut to the platform, hold the platform near the top, and home the Z-axis. If the leadscrew turns freely with no load, then replace the motor.

If the leadscrew doesn't turn freely with no load, then something has screwed up the homing speed / acceleration configuration (and likely other settings), so you must recalibrate everything.

Unfortunately, for old M2s with the wrong Z-axis motor, it's that simple.

sonra
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Location: Israel

Re: stange Z movement

Post by sonra » Thu Oct 08, 2020 3:33 pm

Hi ED
The problem is the motor . do you know if all motors that you send to my in the link has the some screws and some thread spacing as the MG original Z motor??
regards Doron

sonra
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Re: stange Z movement

Post by sonra » Fri Oct 09, 2020 12:55 pm

I found the mechanical diagram of the motor so I an order one
Thanks Doron

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