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Messages - jfmonod

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The best impression I can give of what I'd like is here :  http://www.comagrav.com/oscillating_tangential_knife.html

 This gives a decent overview of the capability I'm looking for. In my previous incarnation as an architecture student at the Swiss Federal Institute of Technology in Lausanne, Switzerland (EPFL) we had a Zund 1200 machine in the shop that still makes my palms itch whenever I think of it : )  Now imagine that my available budget is about 1/10th the cost of a regular machine .... I'm basing this on this model here :  http://solsylva.com/cnc/rack_pinion.shtml    and adapting this    http://www.razertip.com/foredom.htm   to it as a tool tip.

At least that's the theory. If you can tell me what kind of motor size I'm looking at for rotating the knife and what a good approach would be to mount it that would be great. Did I mention I'm an architecture student ? : ) I'm only dabbling in mechanical engineering . As the Comagrav video shows, the tool typically raises out of the stock when rotating acute angles. Obviously curve cuts will require rotating in the material but this still shouldn't require a very big motor to do.

 

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General Mach Discussion / DIY oscillating tangential knife cutter.
« on: May 06, 2010, 03:27:26 PM »
 Hi,

 I am new to CNC and was hoping to build a Solsylva rack & pinion 36" x 48" machine for cutting museumboard, chipboard and corrugated cardboard for architectural models. As these are all paper products that don't machine well, this calls either for an oscillating knife or an ultrasonic knife. For the oscillating option I was thinking of using a power chisel style handheld wood carver. These have a 3000 - 4000 oscillations / min frequency and a stroke between 0.5 - 1 mm. If this doesn't work my second option was to adapt a handheld ultrasonic cutter if I can find one in the 300 - 400$ range.

 If anyone can bring any experience with this sort of build to the table and give me any pointers I might need, I would be most grateful. Especially concerning actually mounting and controlling whichever knife i wind up choosing. What kind of motor do I need for the c-axis and how do i go about turning the actual knife ?

 Thanks

 JF

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