Re: Project Da-Ta CNC mill
ok no response on spinder power ...
Maybe someone have any ideas how to adjust Z axis (vertical) to be 100% perpendicular to the table? If I weld it to the frame that wont be possible.
Re: Project Da-Ta CNC mill
My thoughts on spindle for milling steel are you needs lots of torque and not so much speed. Popular ways to do this are a pulley driven spindle rather than direct drive. Maybe 1kW or so motor into a 2 speed pulley arrangement to drop the speed and increase torque.
3 phase motor into VFD to give infinitely variable speed range would work.
Can also be a servo with encoder if you need rotary position for rigid tapping.
There are also DC motors using variable speed control. I prefer VFD control over these as the inverters give lots of control options and possibly more torque (?)
Z axis alignment to bed is usually done by making the whole column a single unit welded onto a flange. This is then bolted onto a receiving flange on the bed which allows shimming or you can go for epoxy compounds but these are pricy !
Re: Project Da-Ta CNC mill
thank you for your answer, spindle is realy better to be pulley, more torque, I agree
What about bearings for ball screw? Does they need to be high precision? Does they effect accuracity of the machine?
And for clutch? What do you recomend?
https://image.made-in-china.com/202f...t-Coupling.jpg
something like this?