Just thinking out loud here. I have seen table saws that have emergency stop systems that use capacitance (I believe) to sense when something (a finger) touches the blade. The touch sensor trips a brake that stops the blade virtually instantly.
I was thinking something similar could be used to sense contact. It wouldn't prevent a strike, but it would minimize the consequences. Raymond Julian Kettle River, MN The things we admire in men, kindness and generosity, openness, honesty, understanding and feeling are the concomitants of failure in our system. And those traits we detest, sharpness, greed, acquisitiveness, meanness, egotism and self-interest are the traits of success. And while men admire the quality of the first they love the produce of the second. -John Steinbeck, novelist, Nobel laureate (1902-1968) On 11/20/2015 05:50 AM, Gene Heskett wrote: > On Friday 20 November 2015 06:00:00 andy pugh wrote: > >> Has anyone ever tried embedding proximity sensors in their lathe >> saddle to protect against chuck-strikes or backing up against the >> tailstock? >> >> If so, any "lessons learned" about where to put the sensors? > > Chuck strikes would seem to be so "tool mounted" a variable as to be > unsolvable. But I have considered hanging a straight simple button micro > microswitch on the saddle such that if its button is compressed, it > would stop the saddle as it touched the tailstock. I have a similar > setup on the front of the carriage that senses the cross-slide, stopping > it about 10 thou from a crash stop at the front end of the slot in the > carriage, that has been used as a homing switch for a couple years. My > switch positions are such that I can, unless I've a really huge work > piece in the chuck, remove the QC holder, and home the machine without > crashing into something. > > In the FWIW category, the tailstock clamping on a 7x12 is so poor that my > 1605 z screw can actually push it when you think its locked. > > Cheers, Gene Heskett > ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
