On Tuesday 01 December 2015 10:59:31 Stephen Dubovsky wrote: > I have a couple Compact5s and its definitely a brushed dc spindle > motor. Using a KBC DC speed controller on one of them but I can't > reverse it w/o adding some sort of DPDT relay and some time delays. > It uses AC input so pretty easy to use. > > I've thought about adding spindle reversing for rigid tapping. I'd > have to add some sort of DC supply to use the Pico board though. > > SMD
I can do rigid tapping on both machines using Jon's driver. Lots of chuck mass and a weak drive train restrict the reversal speed on the lathe, but the G0704's 1 hp motor can go from 2500 revs fwd to 2500 revs in reverse in just over 1 second flat. I have an electronics junkyard at a former employees place, and in the past he has started several projects, bought the parts in quantity, so the dc supply for that motor is now a 4 pack of big toroid's, each driving its own rectifier and filter bank, and they are seriesed and paralleled to make a 125 volt dc supply good for the 10 amps that motor needs. Those toroids are the hottest thing in that box. The turn on in-rush since theres also quite a bank of caps (30k u-f) downstream of each bridge rectifier, demands a 30 amp breaker to feed that 4 plex its all plugged into, it trips a 20 instantly. Needs a soft starter circuit added, but the 30 A. breaker was cheaper than finding a round tuit, by about a hundred dollar bill. Normal amps on an amprobe at that breakers out with everything but the vacuum running is under 3. I had to drill out the plugin holes in the back of those duplexes to get a 10 gauge wire into them. It seems they have "injineered" it so you can't feed them with more than the 14 gauge thats NEC legal for a std duplex. 10 gauge works just fine. The binder screws on the sides are also restricted and won't back out far enough for even a 12 gauge wire. 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> ------------------------------------------------------------------------------ Go from Idea to Many App Stores Faster with Intel(R) XDK Give your users amazing mobile app experiences with Intel(R) XDK. Use one codebase in this all-in-one HTML5 development environment. Design, debug & build mobile apps & 2D/3D high-impact games for multiple OSs. http://pubads.g.doubleclick.net/gampad/clk?id=254741911&iu=/4140 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Go from Idea to Many App Stores Faster with Intel(R) XDK Give your users amazing mobile app experiences with Intel(R) XDK. Use one codebase in this all-in-one HTML5 development environment. Design, debug & build mobile apps & 2D/3D high-impact games for multiple OSs. http://pubads.g.doubleclick.net/gampad/clk?id=254741911&iu=/4140 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
