[flyboy1015]

I agree, the router runs too many RPM to be cutting aluminum. Is better to use a spindle. I know it costs more too, but that's the way to go.

[osphoto]

I keep thinking that also. I'm doing my research for that spindle. I may use the maxcnc type spindle using a rotozip to power it.

[KTP]

Probably not enough power for you guys, but I am going to use a Taig spindle driven by a 500 watt brushless servo for my cnc router. The Taig has a max rpm of 10000 and a typical runout of 0.0005" and the brushless servo I plan to use has a max rpm of 7000. I will probably gear it up 2 to 1 so I can reach the max rpm of the Taig. A few obvious advantages I see are 1) extremely low noise and 2) precision control of speed and lots of torque throughout full rpm range.

Just an option you might consider. I doubt you can drive the Taig spindle with much more than 500 watts though...maybe even that will be pushing it. Very nice unit for the money though...

[osphoto]

500w servo motor sounds good.

Please pass on you your motor spec as in like where are you getting it? It sounds like something I could use. My formula for this is accurate cuts, cost and speed of cut.

I'm wanting to keep my cost around $300 to $500 if at all possible.

[KTP]

I bought this one on ebay (nobody bid on it, works perfect):

http://cgi.ebay.com/API-Getty-servo-...QQcmdZViewItem

But you can use a wide range of brushless servos. This one runs quite smooth on a trapezoidal amp. You can get those on ebay also...I have gotten them as cheap as $25 each. You can then set the amp up in velocity or torque mode and use a simple trimpot to adjust speed. Personally, I am going to reprogram one of my Pixie boards to generate precision speeds as directed from Mach3, but that is overkill for most people. I also might try and use the spindle in some sort of rigid tapping arrangement since it will have such nice control.