Adding a stepper

[odd folio]

Servus community,

My project is to add an extra stepper to the anycubic vyper. The purpose of the stepper is to move a "stick" behind the print, to push is down, when the bed goes backwards.
But I have no idea how I config the stepper in printer.cfg. The stepper has 4 pins and I have no idea what to do with them.

Thx

[glad briar]

It is swtup’ed as any other steeper see https://www.klipper3d.org/Config_Reference.html#manual_stepper

[odd folio]

But how can i tell, that this pin is used as an step_pin and the other a dir_pin?
The problem is, that the stepper has 4 pins and the config has 4 and I have no idea which pin is a step_pin, for example.

The stepper has 4 pins to activate and deactivate the magnets inside: That's how steppers rotate. But they don't have any direction or step pin.

Btw. I use a 28ybj-48 stepper

This is the setup

I've noticed that the pins are inserted wrong, but this doesn't solve my problem.

[glad briar]

It is not the stepper it is the stepper driver you specify

So open the dataset of your stepper driver and find out what pin is what

[trail elbow]

I am wondering why are there 5 cables towards the stepper motor? Usually there only four ?!?

[odd folio]

one of them is ground, or at least i think it is

[glad briar]

That will not work in Klipper. That is a Darlington array and not a stepper driver like e.g tmc2209

[odd folio]

so i cant use this stepper?

[glad briar]

https://lastminuteengineers.com/28byj48-stepper-motor-arduino-tutorial/#google_vignette

Not in Klipper

[odd folio]

ok, now i dont need to rebuy it, because i destroyed it yesterday

never thought 12V would kill this stepper (it can only withstand 5V) 👍

but thx

[glad briar]

I am still not sure what you really want to do but a servo might do the trick

Or if it really needs to be a stepper use a free motor port on your mcu board

[odd folio]

i hope this makes things clear with my drawing skills

[odd folio]

ah, i see why my driver woudn't work. I thought my stepper was the problem, but it was the driver

[glad briar]

so I guess it should only move 90 degree up and down

[odd folio]

yes

[glad briar]

Therefor a servo would be good enough but I am not sure if you can find one that is big enough

[odd folio]

i just give the motor 24V and 14A. This will be enough power 💀

[glad briar]

A Servo hass 3 wires VCC/GND/PWN

Therre are servos avalible for 24V ;-), but I do not believe you want to lift 200-300kg https://de.aliexpress.com/item/32698354973.html

So I would investigate in that a little more as that is the easiest solution to control an arm as you plan to do

[trail elbow]

What about a 'second' X beam?

[odd folio]

second X?

[odd folio]

i'll buy the ARCELI A4988
These are the cheapest ones

[trail elbow]

https://www.youtube.com/watch?v=NZgjl8W5yrE Something like that but with a second X beam

[odd folio]

so putting a "wall" on the print head, that pushes the prints down. Is that what you meant?

[trail elbow]

Not exactly more like a second x beam using a second Z axis with a offset from the toolhead x