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IndustryArena Forum > MetalWorking Machines > Bridgeport Machines > Bridgeport VMC 1000 22 - spindle not oriented
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  1. #1

    Bridgeport VMC 1000 22 - spindle not oriented

    Hi all,

    have searched through the many many posts regarding similar issues, figured its time to actually post my issue

    have a 1994 BP VMC 1000-22 with a heidenhain 2500 controller, simodrive 611's

    the spindle rotary encoder is heidenhain ROD 420.0000 1024

    having intermittent issues with the spindle orientation being picked up

    If i unplug the rotary encoder and test it i can see the signals from all 3 channels

    when plugged into the BP while its already on it will see the encoder signal, if I switch off the machine and back on it wont pick up the signal

    have tried to chase potentially old wiring but seems to have a clean signal all the way to the board.

    can anyone suggest a troubleshooting sequence to assist in narrowing down the issue

    cheers,

  2. #2

    Re: Bridgeport VMC 1000 22 - spindle not oriented

    so far I've now tested the control board with a scope and I can see the encoder signal going in on A,B, 0 channels with a clear marker for every rotation,

    checking the spindle drive unit simodrive 611a 6sn1135 I can see voltage in relation to rpm, although the voltage is very weird on M3 vs M4, on M4 i can slow the spindle down to 40 rpm and i get a clean input analogue voltage on .035 v if i push the rpm up to 60 i get a voltage in of .053v on m3 if i set the spindle rpm to 40 i get -.04v and the spindle barely spins, if i set the spindle rpm to 60 i get +.061v

    does this give any clue to as to the issue?

    Cheers,

    Adam

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