Re: Re: My CNC Mill retrofit project

> From: Ray Henry <rehenry@...>

> To splice in a new machine brain is not a trivial task. But it should be
> instructive for all of us if you take the time to sort out and clearly
> doccument each step and each decision in the process as you make them.

I agree.

> Matt figures that you need opto 22 stuff. It looks like there is some
> already there. They're shown in the top center of the bottom right photo.
>
> http://www.computersculpture.com/rammill_page.html
>
> It looks like the cards hold four devices each and there are three of them.
> Your mill gif shows them between the power supply panel and a row of
> control relays. That part of the drawing is laid out the same way the
> control box is laid out.
>
> If I'm reading these things right, the photo shows 8 opto devices in place.
> The layout shows 10 being used. The schematic shows 11 being used. You
> might want to keep the 110 volt wiring (red maybe) from these opto devices
> to the relays/contactors that they control in place for a while. Your new
> wiring from a parallel port or stg or (?) would go to the input screws on
> these boards.

Hey, you're right! I didn't look at the photo as close as I should have.
There should be enough of these to do the job. I think the relay (CR2)
labeled MAN. TOOL CHANGE is probably just for a tool change light or beacon.
My big question is what are the characteristics of the interface to the
Lovejoy spindle drive.

Matt