[email protected] wrote: > I have only been playing with cnc for about a year so I am not knowledgeable > I think one of the main problems is rpms > The smaller the bit the more you need > The Colt will run at 30k but most die grinders are only maybe 24k > So what will run 50-60K for hours at a time and not wear out the first week > For that I might pry open my wallet > Well, I got some Westwind air bearing spindle motors from a junked machine. These have centrifugal collets for 1/8" tools, but are designed for drilling, not routing. They can be run off a standard VFD with additional inductors between VFD and the motor. A repair show charges $6000 of a rebuild, so they must be pretty pricey. These will go to 80,000 RPM or so, but I can only do 24K with a VFD that goes to 400 Hz.
I also got a Rockwell/Precise ball-bearing spindle, but it needs TWO-phase power, so a standard VFD can't be used, at least without a Scott-Tee transformer. It will go to 45K RPM, and is 3/4 Hp. Some day I will see about making a custom VFD for it. Jon ------------------------------------------------------------------------------ Systems Optimization Self Assessment Improve efficiency and utilization of IT resources. Drive out cost and improve service delivery. Take 5 minutes to use this Systems Optimization Self Assessment. http://www.accelacomm.com/jaw/sdnl/114/51450054/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
