SOLVED: Sorry! There are potis on those Pololu drivers! To regulate the current! *triplefacepalm*
I am new to electronics and I just picked up again my "Shapeoko-clone" project I started last winter.
Could someone explain to me stepper motor behaviour?
I have:
- 1 "GAUPS Arduino-compatible Stepper Shield kit" GAUPS Arduino-compatible Stepper Shield kit - Amber Spyglass Ltd - (Powered by CubeCart)
- 4 "Pololu A4988"
- 1 power supply 24V 17A 400W Nunus Netzteil 24V 17A 400W f
- shielded cable Ölflex Classic 110 CY 4x0,75 4G0,75 http://products.lappgroup.com/online...ol-cables.html
- SM42HT47-1684B NEMA 17 stepper motors NEMA 17 Schrittmotor | aktive | Elektronische Bauteile | Bauteile | myhobby-CNC
-- datasheet http://shop.myhobby-cnc.de/media/pdf/nema17.pdf
- grbl_v0_8c_atmega328p_16mhz_9600
I wired the machine, but have not grounded the wires yet. See attached pictures.
The stepper motors are currently not attached to any belt.
I issued with UniversalGcodeSender the command
G91 G0 Y9999
as a test.
Reproduceably some seconds (about 20 sec) into this command the second Y-axis stepper motor loses steps (see attached video).
Another 10 seconds or so later the other also loses steps, it even seems the first-Y-axis-motor runs backwards for a very short amount of time.
I am not in a hurry to complete this machine, I rather want to understand things "from ground up".
Could anybody drop some lines about what might be happening here?
Why so late into the command?
I hope I gave enough input.