These are really questions for AjaxScott, but I can address some of them.
http://www.centroidcnc.com/accessories.htm, part #10946 near the bottom of the page.
In general, Centroid has restricted Ajax to the more basic controls (DC servos, up to four axes) while offering more advanced controls (AC servos, up to five axes) under the Centroid brand.From what I've read the AJAX and Centroid controls are the same. On the AJAX website the control is shown with 4 axis controls but the Centroid is shown with 5 axis. If they are the same controller is it possible to use the AJAX mill control to control a 5 axis machine?
I doubt that will change with the current generation of hardware, but it might change with the upcoming generation (which will allow up to six axes using two daisy-chained DC3IO units, or up to eight axes using third-party torque-mode servo drives).
The PC / console portion of the control has little wiring. It is an ordinary PC (which you supply anyway) with the Centroid CPU10 board plugged into one if its PCI slots. Besides the usual power, VGA, keyboard and mouse, the connections are: one DB9 encoder plug for each axis; one DB15 connection for the optional hand control pendant; and five optical fibers to the DC3IO. These connections are shown on the wiring diagram that Ajax provides.Is there a wiring diagram available to enable you to build your own PC/control console as I'd have to import such a thing from the US or is it easy enough to build your own based on a PC?
Yes.The Centroid website shows a console with 2 manual handwheels (MPG's i assume) to enable you to use the machine as a manual machine. Is this possible with the AJAX control?
This is usually done only on lathes, since there are not enough available encoder inputs to have a separate handwheel for each axis of a mill.
On either type of machine you can use the single-wheel MPG pendant with an axis select switch.