[Spam] RE: [CAD_CAM_EDM_DRO] Announcement: Mach3 is now closed loop!

Hi list,

Closed loop implies more then just limit or Estop switches. It is the
process of constantly feeding back the position of the cutter, and comparing
this position to the commanded position. The resulting difference or error
signal is then amplified or used to control the drive to the motor.

Servos are closed loop; they have an encoder or sometimes a tach to supply
the feedback. Steppers do not.

OK, a little over simplified, but you get the basics.

Alan KM6VV

> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of caedave
> Sent: Tuesday, July 26, 2005 2:09 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Announcement: Mach3 is now closed loop!
>
> Definition, definition, definition, but I see what you mean.
>
> By definition your estop switches are closed loop in that they
> detect a state/condition and take an action based on that.
>
> This does not mean that the machine/devise as a whole
> works in a closed loop. That only comes with a fully
> integrated closed loops system, where every error
> is detected and corrected on the fly.
>
> Dave M.
>
> ----- Original Message -----
> From: "Stephen Wille Padnos" <spadnos@...>
>
> > True.
> >
> > And by definition, this is not closed loop for Mach3. Closed loop
> > control implies that the position error is used in trajectory
> > calculations. That's not what was described. The described
> > functionality is more like a traveling soft limit switch - it'll trip if
> > the actual position is outside a set range from the commanded position.
> >
> > It's open loop with an error bar.
> >
> > - Steve
>
>
>
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