On Tuesday 14 May 2013 14:55:28 Cecil Thomas did opine: > Gene, > > I wanted to be sure that you picked up on the fact that the setscrew > is inserted ALONG the thread pitch line PARALLEL to the axis of the > shaft but offset from the shaft axis by the radius of the shaft. So > it in essence forms a round key that CAN BE removed without applying > an oxyacetylene torch. Believe me, with all the best intentions you > will probably want to remove the pulley at some time during the > fabrication/modification phase.....I certainly did. > > PLEASE!!!!! Don't use Locktite. Think about how you are going to > hold the armature and shaft to keep it from turning so you can > unscrew the pulley after you have toasted the front bearing and > probably the windings and commutator. > > >I have a machine with a similar setup, treadmill motor, screwed on > > flywheel. I screwed the flywheel on snug, drilled a #6 hole .75 inch > deep parallel to the axis of the >shaft but on the pitch line of the > two threads, tapped it 1/4-20 and screwed in a 5/8 inch long 1/4-20 > socket head set screw. > > The lawn mower wouldn't start so I put the charger on it and installed a 3/8" long 10-24 grub screw as described above. That looks like it should do it, but some more experimenting with that 5 ohm 200 watt resistor shows that from full speed, it might damage the PM magnets, from about 2/3rds speed it blinked the overload twice before it got in range in the display of my DVM set at 20 amps full scale. Rated at 9.1 amps & 3/4 horse in CCS. So it looks like I need to design a 10 amp constant current load, switch mode of course.
Does any of the chip people have a suitable controller for a 1 chip + HEXFET solution to do this job? I did some googling but didn't seem to come up with a "neat" solution, one I can make from the hexfets in an old computer PSU. They all seemed to have more bells and whistles than this job needs. Or doofy power supply setups. Anyway, the lock screw is in, and the mower has had an hours charge & that IS what I was going to do today. Thanks. > Cecil > ------------------------------------------------------------------------ > ------ AlienVault Unified Security Management (USM) platform delivers > complete security visibility with the essential security capabilities. > Easily and efficiently configure, manage, and operate all of your > security controls from a single console and one unified framework. > Download a free trial. http://p.sf.net/sfu/alienvault_d2d > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! My views <http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml> BOFH excuse #363: Out of cards on drive D: A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. ------------------------------------------------------------------------------ AlienVault Unified Security Management (USM) platform delivers complete security visibility with the essential security capabilities. Easily and efficiently configure, manage, and operate all of your security controls from a single console and one unified framework. Download a free trial. http://p.sf.net/sfu/alienvault_d2d _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
