Thanks to all who replied for the very good information.
To summarise:
- Adding encoders to steppers can be done, and HAL has all the components
needed. using encoder-PID-freqgen creates basically a "servo system with
steppers". Freqgen has parameters for capping velocity and acceleration.
On Wed, Aug 15, 2007 at 11:40:35AM -0500, RogerN wrote:
> Instead of PID speeding up the stepper, could it be connected to feed
> rate override and slow the feed until the stepper caught up?
emc2 offers "feedhold" and "adaptive-feed" pins in HAL (the latter is
activated by M52, not on by default)
- Original Message -
From: "John Kasunich" <[EMAIL PROTECTED]>
To: "Enhanced Machine Controller (EMC)"
Sent: Wednesday, August 15, 2007 8:59 AM
Subject: Re: [Emc-users] Encoders with steppers
> PID's response to feedback falling behind command is to
> I'm
> sure there is a way to solve that problem, but nothing springs to mind
> right now.
>
how about a long limit switch (between 2 encoder indexes), just use a latch
to toggle the state.
to summarize: actual switch AND encoder index -> toggle signal for the
latch.
latch output -> emc home-s
Michel Gouget wrote:
> Dear All,
>
> I am considering adding encoders and home switches to my Sherline CNC mill.
>
> I see 2 benefits:
> 1) Being *sure* of not loosing steps (estop, ...)
> 2) Using (low precision) home switches and the index of the encoder, I get
> *excellent* repeatability when
Michel Gouget wrote:
> Dear All,
>
> I am considering adding encoders and home switches to my Sherline CNC mill.
>
> I see 2 benefits:
> 1) Being *sure* of not loosing steps (estop, ...)
> 2) Using (low precision) home switches and the index of the encoder, I get
> *excellent* repeatability when
Dear All,
I am considering adding encoders and home switches to my Sherline CNC mill.
I see 2 benefits:
1) Being *sure* of not loosing steps (estop, ...)
2) Using (low precision) home switches and the index of the encoder, I get
*excellent* repeatability when homing.
The mill is equipped with re
