Doddy that is an excellent reply my friend and absolutely spot-on correct.!

To the OP don't waste your money trying to make something that was never designed for CNC into a CNC machine it never works out good. Like Doddy says either buy a used CNC mill or convert a brand that is well known for CNC conversion and has been done many times before, like the Sieg's etc.

Or design and build your own machine custom to your needs.! It's not as difficult as you may imagine and with some(lots) research reading the Forum etc you'll soon pick up what's required.
If you fancy this route it's a good idea to start a Build thread and post all your ideas and thoughts there, plus ask all the questions you may have in this one place rather than making multiple threads which are scattered around the forum. This way you can easily find a reply or answer to a question from weeks or months ago without trawling the forum.

Good luck.