Hi, I saw that the question was already answered.. Anyway for a foamcutter light stepper motors will work just fine. In the order of 0.5nm which is equal to 70.8 oz/in. I have built several machines with these type of motors. They work great. Are actually pretty quick as well. Had to slow the cutting down in order to get a nice cut in the foam. The wire starts to drag when youre going to fast...
Greetings, Kevin
www.damencnc.nl (The users gallery might give you some ideas, also a video of engraving is available)