My current 3 axis is a former PCB router. I added a z axis and more powerful steppers.
I kept the original spindle motor. It takes about 70 volts DC and spins around 50k rpm. There is no gear box. It is really nothing special, other than having precision roller bearings. It's about 4 inches long and about 1.5 inches in diameter. I believe a good substitute might be some of the R/C electric motors that spin around this same rpm. ----- Original Message ----- From: "Chris Radek" <[email protected]> Subject: Re: [Emc-users] PCB routing on a CNC mill > On Fri, Jan 02, 2009 at 05:14:03PM -0500, [email protected] wrote: >> >> 1. Very fine line routing will be disappointing, it tends to push the >> coper out of the way rather than cut. This is in part due to the low >> spindle speeds. The velocity of a 1/32 or smaller mill at the cutting >> surface is quite low. A high speed spindle will help immensely. For wider >> lines the resolution is good enough and it is quick. > > So true. Spindle speed and runout are very important. I have good > results at 20krpm but feed rate is limited by the spindle speed. > 30krpm would be better. > >> 2. The best method, at least for me, is to use a toner transfer >> technology to produce an etched circuit and use the CNC mill to drill the >> holes and cut out the board. This process has a number of limitations but >> gives me decent boards fairly quickly. > > Interesting! I have found that this process works pretty badly and is > finicky compared to routing. Maybe I never found the right material > to print on. I only tried a couple times. ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
