New Owner of a manual Maho MH600 !! - Page 2
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  1. #21
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    Continuing the search for a power source to drive this girl at 550V ... I had really wanted to rewind the motors to 230, but with the controls involved at 24V it seems like a daunting operation to convert the whole machine over.

    If anyone has any ideas- I would welcome them (forgiving building an entire electrical power plant to drive one machine)... looking for something like I posted above that is portable and not piped so that easy moves and portability around the shop can be obtained.

    In the meantime... I took this pic of the table ... never thought I would have a mill with a table like this! tilt.jpg

  2. #22
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    Another possibility is a 240-480V single phase transformer feeding two 480-V VFDs with V/Hz set so that the outputs are 52 Hz at 480V. The reason for this choice of frequency is that 480V/52Hz = 550V/60Hz. You'd need probably a 5-hp VFD for the spindle motor and 2-hp VFD for the feed motor, but check the amp capacity instead of the horsepower capacity. You'd probably only be able to get 3-phase VFDs with 480-V capability, so you'd need to make sure that the VFDs would run on single phase input power without throwing an alarm. There would be some gymnastics involved with wiring the mill's controls to the VFD control inputs.

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  4. #23
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    hi Rick, sent you a PM, Rich

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  6. #24
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    In the meantime... I took this pic of the table ... never thought I would have a mill with a table like this!
    And then you need to spend the time re-trammimg it all.

  7. #25
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    Quote Originally Posted by rklopp View Post
    Another possibility is a 240-480V single phase transformer feeding two 480-V VFDs with V/Hz set so that the outputs are 52 Hz at 480V. The reason for this choice of frequency is that 480V/52Hz = 550V/60Hz. You'd need probably a 5-hp VFD for the spindle motor and 2-hp VFD for the feed motor, but check the amp capacity instead of the horsepower capacity. You'd probably only be able to get 3-phase VFDs with 480-V capability, so you'd need to make sure that the VFDs would run on single phase input power without throwing an alarm. There would be some gymnastics involved with wiring the mill's controls to the VFD control inputs.
    You're an animal! I have no idea what you are talking about.... What I would give for a little suitcase that solves all my problems and fits in my glove compartment...
    Thank you brother....

  8. #26
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    Quote Originally Posted by group 5 View Post
    hi Rick, sent you a PM, Rich

    Rich! You're the man! Ill give him a ring and follow up on this thread w results... there has to be an easier mobile solution w a light footprint.... Thank You!

  9. #27
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    Quote Originally Posted by Charles P View Post
    And then you need to spend the time re-trammimg it all.
    I welded a giant 1" standard 90 deg to a 12x12 machined plate to insert into the headstock - then I just drop it onto the table and Im plumb !!


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