Rebuild a CNC router with Arduino

I have an industrial cnc router that i would like to get working again.
It had a chinese controler in it that went bad.
How hard would it be to replace it with Arduino.

It is similar style to one of these: PRSalpha CNC | ShopBot Tools | Produce More
This is not it but give an example.

Hard to say without more details. Assuming the controller consumes some kind of CAD/CAM part file and commands stepper motors acordingly, definitely non trivial though.

Have you seen my project?
http://www.thebox.myzen.co.uk/Hardware/CNC_Conversion.html
You will need bigger motor drivers but it is very possible.

Yes CAD/CAM part file and commands stepper motors.
I will find out more today when i go to work.

WOW what a nice mill project.
That is a good one to add maybe a 3D printer to.
I just finished reading the magazine called: MAKE
It says there are ways to use a mill.

It is similar style to one of these

Those are $15,000 machines. You can't spring for a $300 netbook with keyboard, screen, OS, WiFi, etc. to get your $15K machine working again?

I think that it's better to get parts from CNC Routers and Control Systems | PROBOTIX or similar stores. I had to get parts from Probotix to get an old CNC router working again.

Paul I just used that machine as an example.

You must of missed the part:
It is similar style to one of these: PRSalpha CNC | ShopBot Tools | Produce More
This is not it but give an example.

I lost my job over a year ago and hoped to get it going cheep.

Good idea about laptop.

I will look at the links also.
Thankyou guys for helping me.