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Y Axis not moving fast.

Posted by Lady_Solari38 
Y Axis not moving fast.
July 17, 2019 02:14PM
Good day All!

Into: I am using RAMBo v1.3 with Marlin FW 1.1.9 on my 3D printer.

Configuration :
My 3D printer is made out of aluminum extrusion and has a large print bed.
Travel limit for X is 500 mm, Y is 500mm, Z is 200mm.
The motors are all NEMA 23 motors.
I have 1 motor on X Axis, 2 motors on Y Axis, 2 motors on Z axis.
X and Y Axis is belt configuration. Z is on ballscrew.

On my Y Axis, I used the first Y motor, Y1, on the RAMBo Y Driver and second Y motor, Y2, on Extruder 1's driver, E1.
In the firmware, I enabled #define Y_DUAL_STEPPER_DRIVERS and set #define INVERT_Y2_VS_Y_DIR true

There is only 3 endstops - Xmin, Ymin, Zmin.

The Y axis is slower than X Axis. I got the Y axis to travel a distance of 480 mm from 0 mm.

For X Axis, I can move the gantry fast at F15000 mm/m, but on my Y Axes (2 motors), they are moving at max F10000.

My feedrate; #define DEFAULT_MAX_FEEDRATE {250,250, 6, 250 }
#define DEFAULT_MAX_ACCELERATION { 800, 800, 100 , 1200 }
Jerk does not matter because this is at high speed from 0 mm to 480 mm.

I have gone through the Marlin 1.1.9 FW looking for anything related to feedrate, Dual motors.
Couldnt find anything.

Hence, do y'all know any idea? problems I am not aware?

Thanks in advance.
Re: Y Axis not moving fast.
July 22, 2019 10:31PM
Hey all,

Found the solution.

I am using external drivers, taking step and direction from the RAMBo board to the drivers.

The external drivers have microstep setting.
The firmware have steps/mm settings.

Synchronizing these two settings will allow higher speed/smoother/more accurate movements.
Lower microstep in my case with a new steps/mm setting solved the problem.
Now, my Y axis is moving like fast.

P.S. external drivers with 48V PSU is incredible awesome.

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