On Sun, 10 Aug 2008, Jim Coleman wrote:
> Date: Sun, 10 Aug 2008 00:13:17 -0400
> From: Jim Coleman <[EMAIL PROTECTED]>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <[email protected]>
> To: "Enhanced Machine Controller (EMC)" <[email protected]>
> Subject: Re: [Emc-users] etch-servo pwm output to servo amp's input?
>
> I've hooked the encoders to the parport right now just to see if I could get
> that feedback working directly from the encoders to the parport. My goal is
> to get closed loop motion out of my motors without having to buy a card like
> a mesa. I think that if I can use the PWM output to derive an analog Vcmd
> for the servo amps, I'll be able to run it, slow enough for a parport to
> keep up with the encoder.
>
> I have the mill, the original control has been ripped out of it after it had
> a runaway on Y during a tool change (Y and Z axes are mounted on a gantry
> like, and X is under the table)
> I've only been making enough money to pay the bills and keep the car puttin
> along, so I havnt been able to invest any money into the m5i20 and 7i33
> combo, but I sure would love to be able to get it running at minimill speeds
> with like $20 worth of hardware. buying 40 taper tooling definitely wont be
> easy, I might end up turnin some of my own if i have to.
You might want to try PDM instead of PWM for generating your analog voltages
as the reduced filtering required by PDM will allow you to get a higher system
bandwidth for a given PWM/PDM resolution.
Peter Wallace
Mesa Electronics
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