Hi there!
I´m planning to build a CNC foam cutter similate to the one you can see at http://www.8linx.com/cnc/cnc.htm

I´m not sure of the torque I need, how much oz-in must have the motors??

Thanks!

Not much in terms of torque 50-100oz would be fine.

Thanks for this fast answer ;-)
Another question: Sometimes I see motors at ebay but the seller doesn´t indicate the torque, can I estimate it by the volts, amperes and ohms??

Thanks.

OK, I've seen the foam cutter from 8Link as well and would like to build one that will cut up to an 10" x 20" x 96" block of foam. I would like to know where to get the parts, motors, controller, power supplies for both the controller and the cutting wire. I know that all teh motors have to drive is the cutting wire so I guess whatever was used on that system would be fine. Any suggestions will be greatly appreciated.

OK, I've seen the foam cutter from 8Link as well and would like to build one that will cut up to an 10" x 20" x 96" block of foam. I would like to know where to get the parts, motors, controller, power supplies for both the controller and the cutting wire. I know that all teh motors have to drive is the cutting wire so I guess whatever was used on that system would be fine. Any suggestions will be greatly appreciated.

http://www.hobbycnc.com/foam/4aupcwhcpkg/4aupcwhcpkg.htm

Dave Rigotti
HobbyCNC.com

So Dave, which system do you suggest?

So Dave, which system do you suggest?
Use the 84oz for hobby type machines, the 127oz for larger heavier machines.

Dave Rigotti
HobbyCNC.com

Thanks again Dave.

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)

Kevin,

Thanks for your reply and the URL. I am finding some valuabel information on your web site. I just need to get my old brain working. May I call up on you for instructions, should the need arrise?

Greg