Re: Just to say something!

Arne,
Your entire message is spot on.
If I may add my bit:
We have previously discussed here the pros and cons of the Pic Servo and for
EMC the cons had it, the pros where very few.
I do not believe that anyone who is serious about a good CNC setup should go
this route and certainly those that do want to, should appreciate that what
they need is a G-code to PIC Servo interpreter / driver and not EMC. That
would then put it squarely as a project for Mr Kerr and not Mr Proctor!
The servo, stepper / DRO operations are far from finished and still need
considerable work and debugging and the programmers should not be distracted
from that elementary task with something that will only ever be used by a
very small number of people who want to save a some dollars (most of whom,
after frustration would probably shelve the setup for something better
anyway). Glad to see that Andy Olney is thinking along other lines now ,
such as Dans Driver with DRO.

Mo

> Most of the "picservos" have their own trajectory planner, PID
> filters, and stuff. Many use the serial port. To try to run these
> with EMC, - is a contradiction, and I believe it would just mess up
> things.
>
> "Dumb board", like ServoToGo is very nice, because it has a very
> clean interface. You can easy install other boards. Dan's DRO
> board need only a DAC to be equal. It's simple. You don't even need
> that. You could add a DAC external to the printer port, and there is
> also lots of ADC/DAC boards around. ( you could even connect
> resistors to the parport, and have your own simple dac )
>
> The only thing the ServoToGo board has, compared to ordinary io
> boards, is the interface for encoders, ( as Dan has put on his board
> ). Well, it has a lot more, like timers and stuff, but they have not
> used these in the EMC software - ( maybe for our sake ? You don't
> get dependent on one vendor )
>
> As for the printer port, - this is also easy to extend to more jobs,
> or more steppers, or what ever.
>
> I have the ServoToGo board - it has a lot of nice features. In my
> opinion, it's worth the money, compared to all the time it would
> take to write your own software. I chose it because I would like to
> test EMC features, and to stay with something that should give me
> the same results as what they get at NIST. I have plenty of work
> just to master linux.
>
> ---------------------------------------------------------------------
>
> 1.
>
> Does anyone have some schematics on servo-amps, or links to
> someplace I might find anything. I am trying to work out something .
>
> 2.
>
> If Fred is listning: I have subscribed to nist@onelist.com . Why
> not send messages about emc to the same place ? Then it would be
> easy to know when software changes occur. Or ?
>
>
> file://ARNE
>
>
>
>
>
>
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