On Wednesday 09 March 2016 11:54:06 sa...@empirescreen.com wrote: > We purchased some gear tooth sensors in hopes of using one of the > gears in the K&T for a spindle encoder. Well - we ended up putting a > shaft encoder in the gearbox. > > http://www.digikey.com/product-search/en?keywords=620-1328-1-nd > > Well - move ahead a few years - We are putting a gear in the matsuura > spindle for an encoder. the 2 sensors on the gear seem to work great > for quadrature signal. > > http://electronicsam.com/images/matsuura/sensors.jpg > http://electronicsam.com/images/matsuura/oscope.jpg > > (that is 6000rpm) > > > The issue is that we drilled about a .130 hole for the index but it > acts odd. If you rotate the spindle one direction it will pass the > index and stay high until it passes the hole then you get a little > index pulse low. If you run it the other direction it goes low after > passing the index - and you get a positive index pulse at every > passing of the hole. I think it should stay low (or high) no matter > what direction the spindle is turning (and get a pulse every pass of > the index hole). > > clear as mud?
A bit dense & murky maybe, but since these are likely hall effect sensors, a good degaussing of the area might be in order. I'd almost bet the gear is magnetised. Use an AC powered coil to make it buzz, and remove the coil very slowly to a 4 or 5 foot distance before turning it off. And it would probably be a good idea to move the hall effect devices, and their excitation magnets, a similar distance in the other direction during the time that the coil is energized. With cheaper magnets, the coil could be strong enough to wipe them clean too. So get them out of the battlefield for the duration, then put them back & test. > thanks > sam > > ---------------------------------------------------------------------- >-------- Transform Data into Opportunity. > Accelerate data analysis in your applications with > Intel Data Analytics Acceleration Library. > Click to learn more. > http://pubads.g.doubleclick.net/gampad/clk?id=278785111&iu=/4140 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users 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> ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785111&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
