stepper motors

hi

My stepper motor don't move(XYZ, stepper motors from bits from bytes)... well, sometimes they move... but when they do not move, seems to tremble.. i don't now how to make them work can anyone give me a picture of the conection to the bord? I guess i was wrong on the conections...

take a look here:

[reprap.org]

This is the correct wiring the other problem could be sending the pulses to quickly for the motor, but i don't know the Arduino code so some elese would need to comment on this.

---

Ian
[www.bitsfrombytes.com]

On the boards there is a small adjustable resistor that controls the amount of current fed to the steppers. If this is too low, they might not move.

Note the more current, the hotter the stepper driver chips get. I attached some pretty big heatsinks to mine.
(More notes on my blog)
[renoirsrants.blogspot.com]

The colours for several types of stepper motor are here:
[reprap.org]

which tells you the ABCD colours: and then the board connectors are here:
[reprap.org]

I also had a problem with the x-axis - it would run for a minute, and then would start 'trembling'. Putting a bigger heatsink and adjusting the current fixed it - it now works perfectly.

If you're still having problems:

disconnect everything apart from a single stepper board with a single stepper plugged in.
Remove the stepper from any mechanics or disconnect the belt/chain drive.

Upload the arduino code from this page
[reprap.org]

and connect the wires as described to the arduino.

Make sure you can actually see if the motor is turning - attach a sticker or sellotape to the motor so you can see how it moves.

Turn it all on. The arduino will try and move the stepper immediately.

Apart from that, we'd need a bit more info.
Which stepper? Which version of the board? are any LEDs on/off?
Posting a couple or pictures of the board/connections has also sometimes helped diagnosis.

Good luck!

DaveR