hello
I am 90% done with my milling machine. I made it rigid enough for 8 mm tool milling steel

My question

I found a motor that weigh around 15 kg and I want to attach ER20 to the end of the shaft motor.

motor name plate :
phases : 2 phase or 1 phase
the salesman told me 2 phase but the name plate says 1 phase
volt : 220 volts
Current : 11 amps
horse power : 3
cycles : 60 hertz

Is such arrangement common. I mean attaching the chuck directly to the shaft motor?
the motor shaft is 19 mm and the ID of the chuck I have seen 16mm and 14 mm I did not complete my search yet to see if there are 19 mm.
Most likely I have to machine the motor shaft if I go this route.

What type of fitting is such attachment (the chuck to the motor shaft) is it interference fit or what ?
If it is interference fit does not the chuck comes lose when it gets hot when working the work piece?

I have seen some motor shaft collet chucks that have holes all the way through in the shaft axial way which indicates that ahole in the shaft need to be drilled . Is such arrangement common.

finally the VFD
the motor speed as it is will be a little high for milling steel with 8 mm tool, will a VFD help with such motor?

does the Huanyang type VFD drive a single phase or a 2 phase motor?


many thanks for any hint or just putting me in the correct path

Philip