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. 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. Jon ------------------------------------------------------------------------------ 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
