Maximum Limit For Calibrating Voltage of Z Motor

K8200 3D Printer K8200 - Wiring and electronics
1

All of my motors working with 0.55V calibration.
However Z motor skips steps while moving upwards.
And sometimes do not move and occurs bad noise when I press 10mm upwards button on manuel mode. I know that something wrong with the assembly process. But I couldn’t fix it.

  • I am using flexible coupling between motor and threaded rod.
  • Every moving parts are greased well.

I am thinking to calibrate Z motor a bit higher.
Do you thing that it will damage anything?

I am using aluminum heat sink on the drivers and I will apply 80mm cooling fan above the control board.

2

[quote=“Sdt_Dmr”]
However Z motor skips steps while moving upwards.
And sometimes do not move and occurs bad noise when I press 10mm upwards button on manuel mode. I know that something wrong with the assembly process. But I couldn’t fix it.

  • I am using flexible coupling between motor and threaded rod.
  • Every moving parts are greased well.

I am thinking to calibrate Z motor a bit higher.
Do you thing that it will damage anything?

I am using aluminum heat sink on the drivers and I will apply 80mm cooling fan above the control board.[/quote]

I had similar issues with my Z axis after changing to the Trapezoidal ledscrew upgrade.
The Nut is wery tighly toleranced and likely to bind, cause the weight if the z arm bends the carriage assembly sligtly inwards.

With good cooling the drivers should be able to handle up to 0.8v. But don’t set the too high, cause that will make the
motors run quite hard and noisy.

For cooling the PCB this case, made by raby, is a nice addon :
thingiverse.com/thing:170887

3

Thank you ichbinsnur.

I will try 0,6V-0,65V first
if it does not work, i will set 0,7 or 0,8V

I will write the results here for info for other guys.

4

[quote=“Sdt_Dmr”]Thank you ichbinsnur.

I will try 0,6V-0,65V first
if it does not work, i will set 0,7 or 0,8V

I will write the results here for info for other guys.[/quote]

I’m currently working on a dual spindle z axis mod to spread the weight of the arm evenly over 2 trapezoidal nuts.
I will post my results in a new thread as soon as i got everything built.

5

[quote=“ichbinsnur”][quote=“Sdt_Dmr”]Thank you ichbinsnur.

I will try 0,6V-0,65V first
if it does not work, i will set 0,7 or 0,8V

I will write the results here for info for other guys.[/quote]

I’m currently working on a dual spindle z axis mod to spread the weight of the arm evenly over 2 trapezoidal nuts.
I will post my results in a new thread as soon as i got everything built.[/quote]

I can also apply this method, but I am not good at electronics side (my profession is mechanical engineering)
If we add second Z motor:

  • do we need to apply extra motor diriver?
  • how can we attach them and synchronize them? (I mean wiring modification), extra wiring or etc.?
6

I plan to make an all mechanical approach.
Simply a belt drive that connects the both treaded rods, driven by one motor.

7

It will be interesting.
I really want to see the result.
Can you please share the sketches of the modification?

8

If i got it done i will share the printable parts and a BOM with instructions on Thingiverse.
I also will make a thread on it here and possibly put it on the WIKI. k8xxx-3dprinters.crimed.be/w … =Main_Page

Here are some Pics of the Pulleys and the modified right side z axis support i already made:

double_treaded_rod_z_mod_pulleys.jpg?dl=03264×2448

double_treaded_rod_z_mod_right_z_support.jpg?dl=03264×2448

I post more as the rest of the parts arrive, so i can design the additional parts needed.

9

I set Z motor current to 0.7V and it works fine.
I am using cooling fan and heat sink on the drivers, than the driver do not heat up much.