RE: [CAD_CAM_EDM_DRO] EMC LIST

> I haven't received anything from the EMC List in a long
> time. Has there been any activity? Do I need to sign up
> again?
> Darrell

You may want to resubscribe. I got 8 or 10 last week. Last one I have saved
is from Saturday the 7th. I don't remember if I deleted any of them on
Sunday.

Below is one from Friday that may interest you.

Tim [Denver, CO]

> -----Original Message-----
> From: emc@... [mailto:emc@...]On Behalf Of Fred Proctor
> Sent: Friday, October 06, 2000 3:33 PM
> To: Multiple recipients of list
> Subject: Phase stepping implemented, not tested on hardware
>
>
>
> Stepper motor users,
>
> I put in code for doing phase stepping, as an alternative to
> step-and-direction. The code's on SourceForge, but not in a .tgz release
> yet.
>
> To specify this, just put this in your .ini file:
>
> [EMCMOT]
> EMCMOT = freqmod.o
> STEPPING_TYPE = 1
>
> It only works for freqmod.o (steppermod.o will come once this is
> debugged). If you say 0, or leave it out, it uses step-and-direction.
>
> The wiring looks like this, from a comment in emcmot.c:
>
> Phases are labeled p13 and p19, from Bridgeport stepper motor driver
> pins 13 and 19. The values are converted from step/direction using the
> following table:
>
> dir p13 p19
>
> | ^ 0 0
> | | 1 0
> + - 1 1
> | | 0 1
> v | 0 0
>
> The new value of p13 is the logical result of (p19 != dir), and
> the new value of p19 is the logical result of (p13 == dir), where
> + dir is 1 and - dir is 0.
>
> The bits are "wired" onto the parallel port like this:
>
> MSB low byte LSB
> -----------------------------------------------------------------
> | p13-3 | p19-3 | p13-2 | p19-2 | p13-1 | p19-1 | p13-0 | p19-0 |
> -----------------------------------------------------------------
>
> MSB hi byte LSB
> -----------------------------------------------------------------
> | x | x | x | x | p13-5 | p19-5 | p13-4 | p19-4 |
> -----------------------------------------------------------------
>
> where p19-0 is pin 19 of axis 0, p13-5 is pin 13 of axis 5, etc.
>
> Brave testers?
>
> --Fred