On Tuesday 30 September 2014 12:02:00 Jon Elson did opine And Gene did reply: > On 09/29/2014 10:23 PM, David Nicholls wrote: > > Thanks to Gene Heskett and Chris Radek for their help. I must have > > picked up an electrical noise problem in the index pulse since I last > > checked because it's giving two unequally spaced triggers per > > revolution of the spindle at the moment. This, in turn, puts an > > unrealistic jump in the encoder velocity signal. I could have sworn > > that I confirmed a clean signal coming from the encoders but I must > > have been wrong. Leave it with me to clean up my electronics and > > thanks again for the help. > > No, the index is ONLY used at the beginning of the > synchronized move, and will have no > effect once it is in sync, even when the spindle stops and > reverses. The only time > a spurious index pulse would hurt is when making multiple > passes. Then, the 2nd, etc. > pass would not follow the same sync as the first one. > > So, it sounds like there may be some other problem with the > encoder. You sent a picture > yesterday where there were no pulses on the A quadrature > signals while there were > 4 pulses on the B. This looks like a major problem with the > encoder, and would also > cause the Z axis to stop moving.
I apparently did not get that post Jon. Otherwise I would have been all over it. > You ought to show that top scope photo to some of the other > people, but I think they > will agree your encoder has a malfunction. Definitely. > Jon > 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> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
