David i am not familiar with the boxford but if you have parallel interfacing to the machine then give EMC2 a try. There is a lot of support and it will be free to try. If spindle is controlled via DAC conversion then that can be controlled too. Most things are controlled by pins going high or low so somebody should be able to do something for you? does this machine have servos or steppers?

Check out their site and ask a few questions? you never know you may be lucky?