Hi Chad,
Thanks for the offer of help, I need it.
I am a mechanical engineer and software developer (payroll, invoice, database etc), my electronics is limited. Basic electrics is no problem.
As luck would have it I have a ModIO and a DigiSpeed XL, so it would be nice to use these, by the way this is a mill so I will want to reverse the spindle for tapping.
I have had a look at the switching relay (RL3) and it is a 24V coil
The power rail in the machine has 5, 12, 24, 40 volt dc.
Thanks
Graham.