Let the fun begin !!! ???

[Neale]

I have a 2-way centre-off switch mounted on my control box which has an old pc power supply in it. That gives me both +5 and +12 selected via the switch - purely manual operation. My new machine (under construction for rather too long now) will use gcode switching via the motion control card; I'm not sure yet whether to stick to 5V or to add a manual override to give a short 12V burst at the start of a session or when first pushing water through the system. Once the pipes are full, the system is balanced and it doesn't need much to keep the water circulating (from a bucket at the side of the bench - never gets very warm but I'm not working the spindle very hard).