Quote Originally Posted by soyeb View Post
Only problem i have is he is making a 2 x 4 foot machine while i want to make almost twice that size. what is going to be the best with regard to electronics for my machine or is there a chart or someone who has made a similar size??

thank you
If you hunt through his site you will find information on BlackToe, his 8' x 4' design using chain drive.

If you want to go with leadscrews you will need a ballscrew of 25mm diameter with fixed bearings at each end holding the screw in tension. With a 5mm pitch this will give you 1200mm/min (50ipm) cutting speed and 3200mm/min (125ipm) rapids (limited by screw whip) using an 8Nm NEMA34 stepper with decent drivers (50 or 60volt drives).

For the short, 4', axis a 16mm x 5mm ballscrew simply supported and a 2Nm motor would suffice.