Greetings; I am trying to reduce the f/r error in an ATS667 based encoder.
The index pulse is turned upside down by a reversal of spindel direction. Tts the nature of the beast to remain in this stable state until the approach of the triggering ferrous metal causes the first reversal which the edge ignores, and then goes back true or false as the ferrous piece crosses the center. So I break into the index signal path with a comp looking at the velocity to generate an nearly instant direction signal and use it to diddle an xor which will restore the upside down index signal to same side up, this is then fed to an edge detector which fires on the positive going edge, giving a consistent to the degree reset back to the encoder regardless of spindle direction. Does anyone see any problems with that? The reversal of the pulse at the spindle reverse point should become the out of time and possible way early pulse that sets it up to actually trigger as the piece crosses the center of the ATS667. According to my thinking anyway. Poke it full of holes if I'm wrong. 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-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
