hi, just got my router connected to pc, did all configs.
all axis work ok, but sometimes it feels like the stepper motor gets jammed and I have to switch it off and on to get it working again.
it seemed better when I reduced the velocity.
now the problem is, I can not run more than one stepper motor at a time, they work for about a second and stop.
not sure what the problem is, can anyone help?

Sounds like you may just have your velocity in motor tuning set too high for each motor, either that or the acceleration. With steppers its a trial and error process to find out your particular settings.
If both axis will run individually though then it may be your power supply is not capable of powering both axis.
Can you give more details of your setup?
Hood

hi, the setup printout came with the machine.
it's a small router with nema 17s.

X and Y axis:
vel: 800mm/min
acc 150 mm/sec/sec
step pulse 1
dir pulse 1

Z axis the same but acc. 100mm/sec/sec

Are the steppers just stopping quietly or are they stalling and making a squealing sound ?

Tweakie.

more like stalling with a squeal

Then I think it as Hood said you need to lower your velocity settings for each axis in the motor tuning section (don't forget to save axis settings after each axis alteration).

tweakie.

I reduced the velocity to 200 mm/min and the machine is still behaving the same.
it feels like no enough current reaching the motors

Could be not enough current - this is set and current limited by the driver.
The motors will have a maximum current rating and this must never be exceeded. The voltage rating can be exceeded and it is not unusual for this to be between 5 and 20 times the motor's rated voltage.

What type and rating of power supply are you using ?
What is the rating of your steppers (0.4A 12V ?)

Tweakie.

1. Step angle: 1.8 degree
2. Number of Phase: 2
3. Hold torque: 4.4 kg.cm
4. Rated current/Phase: 1.68 amps.
5. Phase resistance: 1.65 ohms
6. Voltage/Phase: 2.77 VDC

I got this from ebay listing  200590391709

Then I would set the motor current at 1.68 Amps per phase and use a 24Volt power supply rated at 6 Amps output if I was using these steppers but you need to check that your driver board is OK with the 24 Volts.

Tweakie.