motor speed circuit board

Discussion in 'General Electronics Chat' started by hobbyist, Jan 13, 2009.

  1. hobbyist

    Thread Starter Distinguished Member

    Aug 10, 2008
    764
    56
    Hi everyone,

    I have a micro mill drill, it uses a DC motor driven by a speed controler,
    the motor is hooked directly to the controller.

    When I run a tap into a hole for threading, I turn the machine completely off, and spin the chuck by hand, I'll turn the chuck forward about a turn then back off a turn continuously until the part is completely threaded through, sometime as much as a half inch, my question is this,

    by turning the chuck back and forth continually abruptly as I'm doing this tapping process, could I possibly cause damage to the controller, by doing this?

    Thanks for anyones help.
     
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Any voltage potential developed across you motor when used as a generator will be proportional to the speed at which you turn it. You are turning at a couple dozen RPM at most, so the developed voltage will be negligible. Sudden reversals will only reverse the potential, not increase its magnitude.

    With the power off, manual turning of the chuck will have no effect on the motor. With no power applied, the motor is just another spindle on a set of bearings. Your technique for tapping has been used by many thousands of machinists for many decades.
     
  3. hobbyist

    Thread Starter Distinguished Member

    Aug 10, 2008
    764
    56
    Thankyou.

    But it's not the motor I'm concerned about, but the electronic controller hooked directly to the motor.
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
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    There is no danger to the controller.
     
  5. hobbyist

    Thread Starter Distinguished Member

    Aug 10, 2008
    764
    56
    Thank you.
     
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