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

Jon Elson wrote:

>
> Wally K wrote:
>
> > After reading Matt Shaver's post about selling this unit for $800.00
> > to $1000.00 i darn near fell off of my chair. I would say with that
> > price Matt has put this control out of reach of at least 90% of the
> > people that would want it.

This price was based on a configuration that has capabilities equal to a
Servo-to-go card (8 channels of DACs, 8 channels of quadrature decoders,
and several bytes of digital I/O), it's also a wild guess since I really
don't know what the real production cost will be.

> That's all there is on the board, if you don't want differential inputs.
> This and a few decoupling caps comes to $126 - it adds up quick.

The above configuration would require 5 boards of approximately this
cost (the cost of the DAC boards must be higher since the Burr-Brown D/A
chips are not exactly cheap, and the digital I/O board hasn't been
invented yet, but I expect it will probably cost about what the
quadrature decoder boards cost), plus a motherboard/card cage assembly.
That's where that number of $800-$1000 comes from.

> About the only component change you can make is the terminal
> strips. There are $36 of Phoenix Contact pluggable screw terminals
> on this version. Much cheaper terminals should be available, although
> these are 2.5 mm spacing in this design.

I'm pretty sure .1" (2.54mm) headers with .025" square posts would fit
in the same hole pattern and that would save at least $30 of the $36. I
still want the nice connectors...

Matt