Re: [CAD_CAM_EDM_DRO] Re: Windows timing subroutines, how do they work?

Way to go.

My EMCO setups run Standard desk top PC's with NT4
but all the PC does is dump large lumps of the G-code file
to an installed dedicated control/driver card on demand.

Dave M.

----- Original Message -----
From: "Mariss Freimanis" <mariss92705@...>

Subject: [CAD_CAM_EDM_DRO] Re: Windows timing subroutines, how do they work?


> In my opinion it should not be the task of a PC to do the 'donkey
> work' of generating step pulses be it Linux, DOS or Windows. That is
> a task that belongs to dumb dedicated hardware.
>
> A PC is an 'intelligence engine'. It's task is to do a lot of math
> and make decisions. Its output product should go to a 'pulse engine',
> hardware finely tuned to the task of generating of producing pure and
> clean frequencies on demand from the PC.
>
> These are tasks are so diametrically opposed it's like using a claw
> hammer for a screwdriver. In a pinch you can do it but it's not
> pretty.
>
> That also pretty much surmises what I have seen from most PC based
> CNC programs. The step pulse phase jitter is horrible even from the
> most popular out there. The motors sound like a barrel of agitated
> monkeys and I have the scope pixs to prove it.
>
> If things are going to be done right, the PC has to interface to some
> kind of step pulse engine.
>
> The 'agitated monkey' part. Motors that sound like that are being
> robbed of their potential torque especially at high speeds. Phase
> modulation imposes unnecessary torque demands (infinite impulse
> functions) on the motors. Said more simply, you pay for all that
> noise in performance.
>
> Mariss



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