On Wed, 1 Feb 2017 22:43:19 -0800 (PST)
" wrote:

Here is a YouTube of a Reeves Drive in action. The two pulleys on
the motor and spindle change in diameter. Thus changing the speed of
the spindle. Looks like the guy moves a lever to change the pulley
size. And get variable speed. Reeves Drive are a "cheap" way to get
variable speed on a lathe or other machines. Cheaper than electronic

it is an interesting solution

variable speed. Electronic requires a VFD (variable frequency drive)
and a 3 phase motor. Think the VFD takes single phase electricity on
the input side and changes it to 3 phase to power the motor. The VFD
must be able to change the amount of electricity that goes through
and thus change how fast the 3 phase motor runs. I'm no expert on
electricity and how 3 phase motors operate. Have no knowledge of

this is what i learned recently

the vfd opens up some possibilities for using 3 phase equipment