He's looking for a power supply to run his lathe. He doesn't mention charging so low voltage or amperage on the 12v side shouldn't be a problem.
I've got a couple of these and both work well.
The first one is an old 250w AT type. With 4 resistors (I'v forgotten the values) across the 5v tap I have enough power to run 2 chargers at 5a. The only problem is starting the second charger it goes into overload. Solved this by getting a big azz (beer can) size capacitor. The other problem is that certain chargers need a certain amount of over voltage to operate properly. My Tekin BC112 seems to need about 2.5v-3v over the batteries peak voltage to operate. If the battery peaks much over 10v it chokes and goes into low power error. My Novaks don't have this problem.
I got the second one to do just what Galactic wants, run my lathe. It's 155w ATX unit. It has 15a at 5v and 14a at 3.3v. Had no use for 12v in this one so I didn't install any resistors on the 5v tap. The 5v runs my lathe great and I use the 3.3v to break in my stock motors. It will also break in 19t motors if they don't need a lot of start up amperage. I don't think it will start up mod motors.
Best part is I got it from www.mpja.com
for about 20 bucks. About 5 or 6 bucks for a switch and jacks an old computer cord and your in business.