Re: Highly accurate home switch was Re: 3D Contouring - Loss of Accuracy

A highly accurate home switch could be made by using an optical switch mounted on the motor shaft in conjunction with a microswitch on the axis limit. The microswitch being used to enable the optical switch.

Regards
Bob Thomas

--- In CAD_CAM_EDM_DRO@yahoogroups.com, CL <datac@l...> wrote:
> Lee Studley wrote:
>
> >Hi Peter,
> >I've wondered if somehow a software provision/mechanism for
> >periodically re-home-ing during long duration programs could be
> >done. This is sort of a bandaid fix, but would reset the
> >accumulating error. Also, I've been (just) thinking of how one might
> >make a super accurate home position switch.
> >Just ideas,
> >-Lee
> >
> >
> I'm going to look over this thread when I get a little time later this
> evening.... But in regards the above, a little known Beta version From
> Flashcut included this long ago. It was 1.50, and was really a beta
> version around the time of 1.4. It allowed for the installation of a G27
> (?? been a while) anywhere in the file. It would force the machine to
> lift the Z axis to machine zero, then run to X-Y zero. Then, the typical
> homing routine would run, reset all machine 0 positions, then return to
> the job where it left off. It was fabulous, but was not really presented
> to the public for version 1. I have not had the need to use it since I
> had been running so stable, but it is a super cool technique....
>
> I forgot to try it out until just now, but as far as I know, this
> really great feature is ready to rock and roll in the new Version 2 of
> Flashcut. I'll be sure to double check tonight. if for some reason it is
> not in there, I'll be on the horn asking why !
>
> Chris L