Thanks for your replies. Decided to scrap all the original control and have retrofitted with PC control using Mach3 software, CNC4PC breakout board , Gecko microstepping drives plus encoders driven by handwheels for manually moving each axis. As suggested I can use the Mach3 to load the G code creat...

I have a 1984 Orac, but also a very advanced commercial CAD/CAM software (Alphacam) luckily with an Orac post and comms to the machine. The only problem is the limited size of the Orac memory. Is there any way this can be increased ? I don't really want to go down the route of driving the Orac from ...