Need Help! Warner/Swasey QCM-6 lathe with Kflop/Kanalog - Page 4


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Thread: Warner/Swasey QCM-6 lathe with Kflop/Kanalog

  1. #61
    Member TomKerekes's Avatar
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    Default Re: Warner/Swasey QCM-6 lathe with Kflop/Kanalog

    Hi Charles,

    That does seem like a lot of variation. Tachs are normally DC similar to a DC Brushed motor. If it has commutator brushes it is very likely DC. AC reading might be noise caused by the 240V Motor switching nearby.

    Regards
    TK http://dynomotion.com


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    Default Re: Warner/Swasey QCM-6 lathe with Kflop/Kanalog

    Hi Tom.

    If it turns out my tachs are bad, what are the implications of running without them, using the encoders to complete the loop?

    Thanks
    Charles



  3. #63
    Member TomKerekes's Avatar
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    Default Re: Warner/Swasey QCM-6 lathe with Kflop/Kanalog

    Hi Charles,

    If it turns out my tachs are bad, what are the implications of running without them, using the encoders to complete the loop?
    Its hard to say for sure as the Amplifiers weren't designed for current mode. But most likely the amplifier commands current proportional to velocity error, so with no tach the input voltage will directly be velocity error and so directly control current. It may have a small range as a small velocity error of say 1V might try to apply full current depending on the tuning and internal gains. I think it is worth a try. Ideally the amplifier should be tuned so that full voltage (10V) applies full current/torque.

    Regards
    TK http://dynomotion.com


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    Default Re: Warner/Swasey QCM-6 lathe with Kflop/Kanalog

    I'm not giving up yet. Waiting to hear from Mike on my latest results. I cut the wires at the tach to eliminate the cable. Turning shaft by hand, resistance across tach wires varies from 1 or 2 K ohms to 100 ohms, with the highs at say 12,3,6,9 o'clock and lows in between. The X tach is 5-24 ohms.



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