sorry ...i find out my fault. i had a wrong connection in motor coil.now its ok.but still i'm facing some problems and regarding the same i have some questions.
At first when i made wrong coil connection the motor was not rotated and gives annoying sound and heat sink of 4988 driver gets hot at 12 v 2 amp power source. But now after correcting the connection motor rotates ,sound is very very low, and heat sink is not getting too hot at same power supply.
But now the Problem is- when i trying to stop the rotor with little pressure (to check if it can pull the x or y axis body) it stops and then the sound gets little higher.
QUESTION 1- Will it resolve by applying higher amperage?
QUESTION 2- suppose after setting everything properly my motor starts rotating normally at 12 v 2 amp.....after few days i'll buy a 12 v 8 amp adapter.then i apply it 12 v 8 amp. will it work normally? i mean if i apply higher amp than required amp will it damage my driver or motor?
QUESTION 3- what is the steps-
and when and why i need to use them?
QUESTION 4- I am using two stepper motor likely this and a servo (model number-SG90).What amperage i should use and in which value i should keep my drivers potentiometer ?