Spindle Motor

[Bobbyr70]

I am looking for help with choosing a spindle motor for large engravings in hardwood. I have heard about vfd's for speeding up spindles. Does anyone have experience with this? Do I even need this?
What is the best bang for the buck? What brand of motor? What type?
Any help would be greatly appreciated. I am in the process of building a 4x8 CNC table. Thanks, Bob

[in2steam]

Bob,
VFD's work with threee phase motors and AC servos, you can obtain very high speeds with the later, but are limited to about 5000 rpm with a normal 3 phase motor. Your best bet for a router is to use a router like a porter cable or similiar, speed control is cheap and easy and the motor can spin much faster then a VFD adn 3 phase motor would be able to put without gearing. There a few vendors out there that sell a mounting adaptor to the PC base.
chris

[Al_The_Man]

Originally Posted by in2steam Bob, VFD's work with threee phase motors and AC servos, you can obtain very high speeds with the later, but are limited to about 5000 rpm with a normal 3 phase motor. chris

VFD's are generally designed to work with 3 ph induction style motors, servo's are permanent magnet, I have had little success in operating one with a VFD.
There are very high speed 3 phase spindle motors that will operate up to 20k rpm. There cost however is high.
Al.

[Bobbyr70]

Thanks, for this information, You guys are great. I am fortunate to have found such a useful site for learning.