STMBL amps are really quite cool.... Me playing with one as a spindle drive..
https://www.youtube.com/watch?v=7LAtx8o48jI On Tue, Apr 9, 2019 at 6:27 AM Gene Heskett <ghesk...@shentel.net> wrote: > On Tuesday 09 April 2019 05:53:41 andy pugh wrote: > > > On Tue, 9 Apr 2019 at 02:54, Gene Heskett <ghesk...@shentel.net> wrote: > > > You also mentioned that the driver isn't available, is it still > > > being (re)written? > > > > Hardware driver ( IRAM256-2067-A2 ). > > That does tend to drop a wrench in the gears. :( > > > The software side of things works > > really well. > > (plug the STMBL into a Mesa smart-serial port, velocity / position > > command and feedback HAL pins appear automatically) > > Something like the 7i76D does when plugged into a 5i25 with the right > firmware loaded. I am finding that works quite well once the power > supply's for regular 5 volts and field power is rigged, along with a > couple eurostrips for that power distribution. It has 32 inputs and 16 > outputs for utility use, and I'm up to around the 8th input and 3rd > output so far, so there's all sorts of room for expansion yet. I've > skipped the 1st 4 inputs because they can also do 8 bit a/d conversions. > Who knows what I might come up with that uses those in the future once I > have used this thing for a while. Might even rig a keep my coffee warm > accessory. :) > > Or a tool changer. I'll admit thats been wandering around in the back of > my mind. I rather like the idea of the gator sockets on a carousel, > driving the carousel with the mills motors to loosen and tighten the ER > chuck on this spindle motor while locking the spindle by its double d > flats with a solenoid powered wrench. Bigger carousel=tighter ER nuts. > Some sort of a geneva drive to position the carousel to the next tool > driven by a small windshield wiper motor, using its internal switch to > count tool pocket positions. But gator sockets are getting rare, a fad > thats fading? Properly timed regular sockets would even work better, 6 > pointers for long life. Maybe even machine the sockets right into the > carousel disk. I can do that on the G0704 easily enough. > > But then how do I synch the spindle with them, which is probably why the > hackaday version used gator sockets with their built in springs. Highly > failure prone IMO. The only thing I can think of ATM is to take the > minimum speed back out of the spindle driver and hit it with a second or > so of 2hz to make it "find" the socket. > > I've never used the spindle orient function so no clue if that could be > used with a vfd. That would obviously need a 1 slot/rev encoder, a > needless bit of complexity. > > Problem to be solved by experimentation. I can't see the mechanical > complexity of vertically spring loaded sockets, which is what the gators > are in effect. Ideally, a signal from the vfd that a locked rotor has > occurred, stop the descent, at which point give it a short burst in the > other direction to free it up in case its wedged, and continue lowering > the tool into the empty socket. Complicate the control to simplicate the > mechanics should be the plan. Another question TB answered is how much > room below the tool should a second disk be put to stop it from > completely dropping the tool. This could be used to establish a > consistent Z offset. I can also see a need to rehome the XY after a tool > change in case a motor looses a few steps tightening the nut. > > See what happens when i let my imagination out to play w/o a chaperone? > And I'm still on my first cup. :) But the idea is to spread potentially > usefull ideas. My TANSTAAFL contribution if its usable to anyone. > > > Unfortunately without the power driver IC that is all that happens, no > > motors turn. I guess you could use the analogue inputs and digital > > outputs for something ;-) > > And whats the suggested workaround? > > 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 > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
