Denford Micromill Spindle Control Circuit

[aharman]

I am trying to convert my Denford Micromill (2001 model, Denstep control card) to run on EMC2, Mach 3, etc.

So far I have removed the top board and managed to wire up the parallel port directly to the 96 way connector on the Denstep card so I am able to control the stepper motors, as per guidance found in this forum.

What I cannot figure out is how to interface with the spindle control on the board (i.e. 0-10V output to feed into the Sprint motor speed controller). Has anyone accomplished this and please could you offer me some guidance?

Many thanks!

[Denford Admin]

If you wanted to take advantage of the isolated analogue output from the Baldor bottom board then this post may help you get started:
/viewtopic.php?f=54&t=325

It looks as though there is a 5v PWM output from the top card which controls the analogue 0-10V output

[aharman]

Thank you! I'll see how I get on, but might just end up buying a separate breakout board and spindle speed controller.

[Denford Admin]

Remember that it must be isolated (for that drive anyway) - the analogue is not GND - 10V but more like 100V - 110V (IIRC )

[aharman]

Ahh, I see. Thank you, I will bear that in mind.