On Friday 06 March 2020 21:50:15 Jon Elson wrote: > On 03/06/2020 05:38 PM, Gene Heskett wrote: > > I have now put 2 ATD667LSG's on this block and have failed to get a > > working index pulse into linuxcnc thru the encoder index pin of a > > 7i76D. > > Note these sensors are open-collector, so need a pull-up > resistor. > > > I've mounted it branded face against a block of alu, with a green 3 > > pin socket to allow unplugging it quickly, and I jbwelded a piece of > > a nail to the side of the drawbar cap/bolt retainer at the top of > > the spindle, but I can't get a false out of it at any orientation of > > the nail or a tool waved past it. > > The sensor is on the end where the leads come out of the > package, but at right angles to the > leads. That's the "branded face". So, it sounds like you > have them mounted backwards.
That cross patterned face is then a target to be machined into the mount to locate it more precisely? I'm in the house but I now seem to recall that its the smooth side that's facing the gear in the lathe. Duh. It takes a 16mm projector lens and damned strong light to read the text printed on the "branded face". What the hell were they thinking? You're saying that the depressed cross in the 5% smaller face is not the sensed face? That the crossed pattern should be the face glued to the mount? In that event I also have them wired reversed polarity. Which shouldn't hurt them as they are rated for up to 18 volts of reversed voltage. But by now, I'll have to do some chisel work to remove and likely wreck a 2nd one. Sigh. This is what they mean when they say an education costs money... I only bought 6, paying about $2 more from digikey because all the $6 ebay ones were in the middle of the virus in china and 6 weeks away. Thats also an excellent example of a piss-poor 14 page document they supply. That cross grooved face is much easier to identify. And mount to the smooth face, the jbweld oozing out can also cause lead shorts much easier. > The gear tooth needs to wipe sideways across the sensor to > be registered. So, a gear > tooth that is parallel to the leads will be sensed as it > wipes across the face of the sensor. Or in this case, 1/2" of a 2" nail, jbwelded to the outside of the drawbar retainer cap which will swipe across the smooth face as the spindle rotates. Now I am pissed at me. > Motion of the tooth will be at right angles to the leads. > > Check if the sensor +5 V is drawing any current (should be > about 7 mA). Are you sure you have not > connected to the "test" output (pin 3)? They don't say what > this pin does, just tell you "tie to ground or > leave open". Which I've always clipped off... > Jon Thank you Jon. > > _______________________________________________ > Emc-developers mailing list > Emc-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-developers 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
