Re: Re:EHP External Hardware Proposal

Hi Ian,
reply in text

Ian Wright wrote:

> From: "Ian Wright" <Ian@...>
>
> Hi,
>
> Ok, you've got me interested but there's one thing I can't quite understand
> yet - if you are using an external 'black box' to control the motors, where
> is the logic that controls the speeds of the various axes so that 1000
> assorted 'X' pulses plus 1000 assorted 'Y' pulses produces a perfect circle?
> As I see it now, EMC or its windoze equivalent does all the working out of
> pulse timing to ensure relevant positioning of the axes but, using an
> external box, this function would somehow be transferred outside the PC. For
> this to happen, the external box would seem to have to be intelligent enough
> to be able to work directly from something akin to a g-code file and, if so,
> what is the function of the PC in this now?

As I see it, the PC will do the math, and send the data to the hardware, which will then control the motors.

> Is it just a storage device and
> is the external hardware really just a kind of stripped down version of a
> completely stand-alone machine controller?
>

No it will still be busy doing the math and keeping track of the external hardware's progress...

No details yet, I have a few ideas about the whole handshaking and data transfer operation... The is also confusion about
stepper and servo...
Some people are wanting a "do it all" device. Myself I just want to control steppers.

hansw

>
> Ian
> --
> Ian W. Wright
> Sheffield UK
>
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