On Friday 20 November 2015 07:58:20 Les Newell wrote: > On 20/11/15 12:30, andy pugh wrote: > > One concern with any such idea would be that swarf might trip the > > sensor. Some super-clever frequency analysis might be needed (3x or > > 4x spindle speed) to tell the difference. > > A mechanical switch is probably best in this application. Swarf is > unlikely to provide the solid push needed to operate a switch. It is > possible that swarf can get caught between the switch and actuator > making it trip early. Even then it is only a problem if you are > running very close to the trip point in normal operation. > > Les
I wonder how a hall effect might work, to sense the chucks jaws going by when it gets too close? I think I'd boost the length of its output pulse with a one shot to make sure its triggering wasn't missed though when the servo thread is the only one, no base thread to read it every 30 microseconds. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
