Hi Dave > I think this could be done as a geared solution,
Of couse, I forgot to mention, there will be a reduction gear about 1:50 or 1:100, the motor is not very strong and the scanner ways about 5 kg and will be mounted eccentrically, so it will create quite some torque and inertial mass. > if you could work from a phase locked (to 50hz) clock at some > higher rate, I guess I could build a external PLL to generate more or less any frequency from the 50 Hz, yes. > and use that as the encoder signal, and the 50hz > as a trigger to g76 with suitable parameters it would then be > synchronised and have a flyback (gate the laser off then), I'll look into G76 (I never worked on a CNC lathe, so I haven't used it yet), but I think I don't get the 'flyback' part. > or use g33 By the way, can the starting angular position of the thread be specified in LinuxCNC? The machines here running LinuxCNC do not support rigid taping (no spindle feedback), so I never used G33.1. On Sinumeric controls it is possible to set the starting angle of the thread. > or play with the gearing that can be used > with hobbing, see http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Hobbing > (add any logic to suit). The video link in the Wiki article is broken, I guess it refers to this video, if so I'll update the articel: https://www.youtube.com/watch?v=ZhICrb0Tbn4 See you Flo ------------------------------------------------------------------------------ Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
