Spindle Motor Control?

Hi Guys

I have just started to convert a Bench style Mill/Drill to full CNC and
have a couple of questions. I would like to add some features to my
control system rather than having just a basic power supply.

(A) First off the motor that drives the spindle is a 220 volt capacitor
start. (It does Not have the mechanical starter switch) Is there a way
to adjust the rpm of this type of electric motor. I understand that you
can have the Software control the Electric Motor using one of the wires
in the Printer Port, but I need to know what is required to actually
control the Motor speed?

(B) Secondly I would like to install a hand held control box like what
you see on many Factory supplied milling machines. Here are some of the
features I would like on this hand held control:

(1) An Emergency stop button.

(2) Speed Override. The ability to adjustable machining speed (IPM)
while the Software is running.

(3) Jog Control on all three axis. Have the ability to control the
Servo Motors and move the "X", "Y" & "Z" axis for part set up. (When
the Software is not controlling the Servo Motors)

If you have any information (Schematics or Plans) or ideas on designing
these options or know someone that has used them, I would be interested
in hearing from you.

Thanks in advance for the help.

Best regards

Bill Blackburn


PS: Other features which would be nice to have someday:

(A) A probe for finding the edge (or center) of a part before starting
to machine. (Setting the 0-0-0 of a part)
(B) The ability to record the dimensions (X,Y,Z) of a particular part
with the use of a touch probe. (CAM)
(C) The ability to record your movements on a milling machine while
operating it manually.
(D) The ability to use the Servo Motor Encoders for a DRO. (Would be
great for manual machining)
(E) A devise you could connect to your control box/computer that would
measure the different lengths of each tool.

Lots of neat ideas. It's always nice to dream. :-)