I am serioulsy considering building my own cnc router. And for some reson my first consideration is what kind of forces are going to be excerted while operation the table.
For example as the motor rotates it has to accelerate, I know this requires the most torque. And it needs to accelerate the screw. OK. There is also the screw/nut efficiency. Then the wheigth of the spindle, rpm and screw pitch. But what I am missing is the thrust required to cut througth wood.
In escence I want like anybody else, a CNC machine that is inexpensive but will go as fast as possible. EASY!! I am mainly going to be cutting wood and if the price does not go much higher, I would ocassionaly cut aluminum.
One thing that would help me is to know what is the speed upper limit when cutting wood. Can it really be high???
A possibility for me is to get something reasonable and make the frame so it can withstand higher stress, so if it all works then I jusst upgrade the motors.
I have to say that I have been looking for a while for this info. I happen to have a copy of the machinists handbook, and it does explain how to calculate thrust for cutting metal. The little example they give is for around 6000 lb!!!!