On Thursday 18 September 2014 13:53:32 Gene Heskett did opine And Gene did reply: > On Thursday 18 September 2014 09:48:12 [email protected] did opine > > And Gene did reply: > > I'd also be interested in some samples. The lathe I am working on has > > 9 gear ranges and it might be nice to utilize perhaps three of them > > to optimize torque in the speed range desired. The spindle encoder > > is on the spindle so it will give actual spindle speed no matter > > what range the gears are in. There are plenty of inputs available if > > I wanted to put some sensors on the gear shifts so LinuxCNC could > > tell what range it's in. > > Mine is on the spindle too, but only 2 gears at about a 1/2.2 ratio. > Not nearly as complex. I have dreams of checking the requested speed, > and if its not usable in the range its in, block that speed, sending > only a 30 rpm request, and run a windshield wiper motor to shift it, > then let the requested speed thru. I have a small pile of 12volt auto > motors that might be able to be cobbled up to do that. I'll go look > and let my imagination out to play. ;-) > > Cheers, Gene Heskett
Turns out I had trashed a bunch of that stuff a year ago & forgot it, so all I have left are coil fielded universal motors that run on line voltage. They would run nice on the spindle motors psu but would need direction relays to reverse the fields yadda yadda. And it drives a pinion that I don't have a matching rack for. I could make one on the mill, out of alu since its not a multi-ton push. 2 or 3 lbs is enough. Easy to make square cross section teeth would work as well as well formed teeth for this. And it would be a lot easier to put tally switches on the end points of the rack too. But I'd use it bass ackwards, low gear would be the higher gain mode, with it between the pid.s.out and the pwmgen.in because what I'd want would be more motor speed when in low gear. That would have the double effect of raising the error gain which would have to be a net plus at the lower speeds. First, take some measurements & see what the tooth spacing on a home made rack would need to be. 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> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ Slashdot TV. Video for Nerds. Stuff that Matters. http://pubads.g.doubleclick.net/gampad/clk?id=160591471&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
