CNC Drill Bit Sharpener

Someone posted this link on the Home Shop Machinist Groop.
It's a video selling a way cool CNC Drill Bit Sharpener.

http://www.darex.com/xps/xps-sharp.html

Notice the homing switch operation.

I want one, I want one, I want one.
I'm going to comtimplate on building one.

Dosen't seem it would be very complex.
Could be mounted on my existing grinder.
3 axis with small size 23 step motors should be sufficient.
Power Supply requirements probably would be low.
Probably can use small inexpensive 2A driver chips.
Thinking that the motor step rate is not very cryticle,
making the use of a parallel port to supply the step
and direction signals, even if it is riddeled with
interrupts.

My brain will probably pop when programing for the
complex curves needed.
I assume that these curves would be the same for small
or large size bits of the same type.

Tom M.