Re: [CAD_CAM_EDM_DRO] Re: PC based CNC system architecture

Wally K wrote:

> This is were i loose you. When you say the above configuration...ect
> i am not sure what you are talking about. At one point you talk
> about 8 channels then later you talk about 5 boards. I do not
> understand what these boards are for or what boards are required for
> servos and what boards are required for steppers.

Sorry, I probably have put enough info out on this list to answer
the question, but I didn't put it all there in the same place.

So, the whole idea of what I'm doing is to make a mix and match
system. You select cards with only what you need.

The axis boards are 4 axes each. There is an encoder counter,
and a 16-bit DAC. There will be a 4 axis stepper rate generator
which connects to the encoder counter for open-loop operation.
The encoder counter counts the step pulses, so there is no
possibility of the PC failing to count a step pulse.
Of course, you can use the encoder counter to count a physical
encoder for a closed-loop stepper system.
The final board is a digital I/O module, which will have 16
opto-isolated input channels and 8 solid state relay outputs.
Everything will be on-card, so you don't need any expensive
opto-22 boards or wire breakout modules. There is a
backplane module which can have up to 8 connectors to
accept up to 8 of these boards, in any combination you need.
For a 4 axis system (either stepper or servo) with one
digital I/O board, there would only need to be 3 boards in
the backplane. The 5 boards needed for up to 8-axis systems
would have 2 boards for each group of 4 axes, plus the digital
I/O board. I guess this is for the hexapod guys.

Jon