Quote Originally Posted by Jonathan View Post
Incorrect priorities.
A heavy gantry (and machine in general) is good since you want to have as much strength as possible. Making cutouts, including the ones you have already drawn, just wastes strength and money. Rigidity is far more important than feedrate. If you're reducing the mass to improve the feedrate you're going about it the wrong way - you should select the motors and drivers to get the feedrate you require which, as Jazz said, means buying 70-80V drivers such as the M752. Bear in mind the stepper motor output torque at high speed is roughly proportional to the applied voltage, so going from 45V to 75V is a 67% gain in torque where it matters.
Yep has Jonathan knows I agree with him 100% . . .Don't cut mass for speed. I'd do without the speed before ridgity every time.! To be honest Ridgity can make up for the lack of high feed by allowing deeper DOC.

Sell The G540 get the bigger drives you won't regret it and you'll be amazed what them motors can do on 70V.!!

I'm an X Axis is long Axis believer has well and anyone who says other wise is a numbnut . .Lol