Z motors dont move up when printing(M8x2mm leadscrews).

johnz
Posts: 23
Joined: Mon May 18, 2015 12:37 pm

Z motors dont move up when printing(M8x2mm leadscrews).

Post by johnz » Wed Mar 09, 2016 1:21 pm

I have a geetech Acrylic i3 with the GT2560 board I put the I3X single extruder firmware. Everything works except when i go to print the Z motors don't move up as it is printing they just stay at one layer and don't move UP...pleas any HELP..??? thanks.

Mark
Posts: 1553
Joined: Thu Aug 06, 2015 9:19 am

Re: Z motors dont move up when printing.

Post by Mark » Wed Mar 09, 2016 9:55 pm

is your Z axis homing ok? when you manually control Z axis, will it move as you told?

johnz
Posts: 23
Joined: Mon May 18, 2015 12:37 pm

Re: Z motors dont move up when printing.

Post by johnz » Wed Mar 09, 2016 10:29 pm

yes the homing is good everything homes good all motors except the z axis wont move up when printing..??

johnz
Posts: 23
Joined: Mon May 18, 2015 12:37 pm

Re: Z motors dont move up when printing.

Post by johnz » Fri Mar 11, 2016 9:52 am

One of my rods bent so I bought 2 of these will that make a difference??
Attachments
s-l1600.jpg
s-l1600.jpg (49.09 KiB) Viewed 10845 times

Mark
Posts: 1553
Joined: Thu Aug 06, 2015 9:19 am

Re: Z motors dont move up when printing.

Post by Mark » Fri Mar 11, 2016 11:05 pm

will it fit the couplers and the holes on the frame? If so, then I think you need to calibrate the steps/mm for the Z axis, check out this guide:
http://reprap.org/wiki/Triffid_Hunter's ... de#Z_steps

johnz
Posts: 23
Joined: Mon May 18, 2015 12:37 pm

Re: Z motors dont move up when printing.

Post by johnz » Sun Mar 13, 2016 4:39 am

Not much of a guide?? Where In the firmware do I find this or how do I adjust it









/
/

Mark
Posts: 1553
Joined: Thu Aug 06, 2015 9:19 am

Re: Z motors dont move up when printing.

Post by Mark » Mon Mar 14, 2016 11:10 pm

You can find the settings in the configuration.h tab of the firmware and adjust it:
#define DEFAULT_AXIS_STEPS_PER_UNIT {80,80,2560,93}

Or there is a easy way to do this, you can manually move Z axis up 50mm, and then measure the actual length it moves, compare to these two values and set a proper steps to the Z axis.

johnz
Posts: 23
Joined: Mon May 18, 2015 12:37 pm

Re: Z motors dont move up when printing.

Post by johnz » Wed Mar 16, 2016 2:31 am

ok this is the kind of I have .. M8 x 2 Trapezoidal thread ..im going to do some more search on how to set it up??

Mark
Posts: 1553
Joined: Thu Aug 06, 2015 9:19 am

Re: Z motors dont move up when printing.

Post by Mark » Wed Mar 16, 2016 3:54 pm

The original one for the I3X Z axis is 200*16/1.25=2560, so I think then your new rod would be 200*16/2=1600.

hexa
Posts: 1
Joined: Thu Jun 02, 2016 7:17 pm

Re: Z motors dont move up when printing.

Post by hexa » Thu Jun 02, 2016 7:22 pm

Hello Dudes,
i have these M8x2mm trapezodial leadscrews too!
Like Mark said the calculator says that you have to set your esteps/mm for the z-axis to 1600.
When i enter this value my z axis moves way too far!
I don´t understand why because the math is correct for this when you have a motor with 200 steps and 16 microsteps.

So i figured out that a value of 400 is right for me!
With the esteps set to 400 my z axis moves very accurate !

I also needed to set the current of the stepper driver to a higer value. Before the poti was at 50% now it is at 75% :)

Post Reply