Let the fun begin !!! ???

[PAULRO]

hi Neale, how do you control the 12 volt psu dropping out and the 5 volt kicking in?

[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).

[PAULRO]

I have been busy most of the week but did have time to try and sort out the 1.5 v issue with the PWM on my breakout board. I tried changing the settings but didn't have any luck. in the end i had a read of http://www.mycncuk.com/threads/7388-...se-Spindle-VFD (courtesy of Clive ) and decided to give this a go. i found a 10k 10 turn pot and it works a treat. i lost faith with the PWM control from the BOB because it ran on its own at a low R.P.M.when switched off and i didn't want to take any chances. The pot is on the door next to my P.C. so it worked out o.k.
. my next task is to flash the table top and get it ready for some tee slot extrusion . i will have to revisit the PWM at a later stage when i'm more familiar and comfortable with the whole experience.