I have a thee amp stepper motor along with a pololu driver.the driver says it can handle two amps per coil and had a current limiter on it. The power supply says it can provide 12 volts at 15 amps. If I use this power supply.am I going to burn every thing out?
Just because a PS can deliver up to 15A doesn't mean that 15A will be flowing, unless you have little enough resistance (high enough load) to actually draw that much.
The Polulu driver can handle 12V? If so it can handle that supply... You might be wise to measure the output voltage on no-load to check its behaving.
Here's a link to complete instructions to do what you want: http://www.hobbycnc.com/information/downloads/.
If you run a switching power supply with no load it will blow up. A switching power supply will keep trying to increase it's out put until it hit it rated voltage. If there is no load there is no voltage so it just keeps trying until it smokes. So don't run it with no load.