Cincinatti Arrow 750 - potential spindle drive death


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Thread: Cincinatti Arrow 750 - potential spindle drive death

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    Member Burf86's Avatar
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    Default Cincinatti Arrow 750 - potential spindle drive death

    Hey guys, recently acquired an Arrow 750 and thanks to the grand help from folk on this forum I managed to get it up and running and made few bits with her, but I've now run into spindle problems, it intermittently won't run.
    The problem just came out of nowhere, or it might be attributed to a crash... So I did have a crash, nothing too heavy I don't think. The Z was rapid down and the tool length was incorrect, so the tool holder hit the piece in the vice. The spindle wasn't turning for this one. Everything seemed to be ok and I carried on. Had a second semi-crash where the tool wasn't long enough for the pocket it was helixing into, and again the tool holder hit the piece in the vice. The spindle was on for this one but I managed to hit the emergency stop before things got too wild, surely no more load than a heavy cut?

    Then one day I switched her on and during alignment, the spindle turned a small amount and then nothing else. Turned off and on again but no luck. The next day she fired up just fine but wouldn't give the spindle high RPM's. The next day she worked fine and I made a few bits and she died mid-program. The next day wouldn't even move the spindle for alignment. The next day worked all good all day. The next day she moved a small amount during alignment and now here I am...

    The warning that comes up is;

    Alarm 39-97
    Spindle drive not ready
    Cause 1: The spindle enable signal is not on, but the spindle drive ready signal is on. It should not be on at this time
    Cause2: The spindle enable signal has been set on, but the spindle drive ready signal has not been received.

    I have spoken to my machine engineers and they have said I can take the spindle drive out and send it up to them for testing to see if it's actually the spindle drive causing the fault, but figured I put some feelers out here as well. The fact it has been intermittent has me questioning whether it's a drive fault, or a loose connection caused by the crash, or some dirt has been shaken loose by the vibrations?



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    Member machinehop5's Avatar
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    Default re: Cincinatti Arrow 750 - potential spindle drive death

    ...door switch, tool changer interlock, low oil level, air pressure, anything 5V check/clean all Plugs, etc, etc...
    good luck hunting



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    Default Re: Cincinatti Arrow 750 - potential spindle drive death

    Does it have black drives, if so it is a Kollmorgan drive and you should contact Kilroy corporation 937-660-5313. Do you have a red fault light on the spindle drive. There is software that you can look at the drive and find out what the error is. You may have rattled something loose, shut down the complete machine and tighten all the electrical connections. You may have a bad input or output relay causing the problem. I assume that you have a A2100 control, you can look at programware in the service window to see what the I/O is doing.

    MIKE CNC Machine Services INC | Cincinnati Milacron MachinesCNC Machine Services



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    Member Burf86's Avatar
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    Default Re: Cincinatti Arrow 750 - potential spindle drive death

    There are three sensors on the spindle, I guess these are the encoder? Two of them have red lights on and one does not, so I'm guessing this is the cause? If I turn the spindle by hand there is a 4th sensor round the back that lights up as the doohickey goes past. (Sorry, I am proper clueless)

    There isn't a red fault light on the Kollmorgan drive until the machine is given power, then it lights up.
    Also, yeah it's an A2100. Thanks for the tips.



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    Default Re: Cincinatti Arrow 750 - potential spindle drive death

    The encoder is in the spindle motor and is not visible at the spindle. The 3 sensors you mentioned are likely for the drawbar and would have no effect on spindle alignment. The 4th one is likely because you have the high torque spindle which could affect alignment if it is not working properly but you seem to indicate it is (it should be on for 1/2 the revolution, off for the other 1/2)



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    Default Re: Cincinatti Arrow 750 - potential spindle drive death

    The red fault light indicates the drive has detected a problem, as Kilroy mentioned, you can use Motionlink to see the recent error history which my point to a cause.



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Cincinatti Arrow 750 - potential spindle drive death

Cincinatti Arrow 750 - potential spindle drive death

Cincinatti Arrow 750 - potential spindle drive death