On Monday 13 May 2013 16:04:37 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. > I 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. > At which point I'll be bidding on another on fleabay :) Note that there is a stub sticking out of the commutator end that can be grabbed with a loose drill chuck that has served to furnish the torque to uncrewed it a couple times already. I'll see what I have for grub screws, because that thought will also appear to work better than the existing keyway in the 17 tooth timing belt pulley that goes on the other end of this countershaft, however, that thing is acetel or similar plastic so I expect I'm stuck with the key. If a gear in the head doesn't strip, that key is the weak spot there. I have a replacement for it coming, along with that 5" chuck and it has a 9mm bore, whereas the OEM has an 8mm bore, so I have to assume they already know its a weak spot. > >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. This motor is only a horse at flank speed, so I expect a #10 or #12 screw would be more realistic, but its a good idea, better than loc-tite I believe. I'll save the loc-tite to set the shaft bearings in place, and the shaft into the bearings, once I get everything else ready to rock & roll. Thanks Cecil. > > 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> "I don't think so," said Ren'e Descartes. Just then, he vanished. 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
