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  1. #16
    Join Date
    Aug 2011
    Location
    Melbourne
    Posts
    4,779

    Default

    The beauty of using PWM to control DC motor speed is that regardless of the speed setting, the motor still sees the full voltage, so torque is not compromised.

    Simon
    Girl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.

  2. #17
    Join Date
    Apr 2012
    Location
    Healesville
    Posts
    2,129

    Default Changing belt speeds

    I didn't want to hack a hole in the side of the mill so I devised a way to change belt speeds from the front, it goes like this.
    1st loosen belt, lift flap and insert right hand in hole to move belt from one groove to the other while also turning the pulley and your left hand operates the lever
    that guides the belt up or down on the rear pulley.

    I made a temporary pulley support bracket to test my theory while making the bits and pieces.
    Attached Images Attached Images

  3. #18
    Join Date
    Apr 2012
    Location
    Healesville
    Posts
    2,129

    Default 10mm plate

    The top of the mill is alloy so i cut out and fitted 10 mm plate for the motor mounting plate to slide back and forth on and I had .0075" runout at the top of the input shaft.
    I had been looking forward to checking that as when I set the shaft up to grind the spline off the top brg mounting surface was an oval shape, so .0075" wasn't to bad l guess.
    I decided to fit an outer support brg for this shaft as it is hollow and I had removed a bit of its meat and it has a bit of runout, so I used a brg with a larger ID and made a bush and bored it .0075" off centre.
    I installed a dowel pin either side of the input shaft and threaded holes in the cover for jacking bolts to remove the cover.

    The shaft support bush and the motor mount pivot bolt are made out of EN36A
    Attached Images Attached Images

  4. #19
    Join Date
    Apr 2012
    Location
    Healesville
    Posts
    2,129

    Default assembled

    some more pics
    Attached Images Attached Images

  5. #20
    Join Date
    Apr 2012
    Location
    Healesville
    Posts
    2,129

    Default quill motor test

    Thought i would do a look n' see if it worked ok..... https://www.youtube.com/watch?v=0zEVYv5iTyI

  6. #21
    Join Date
    Jul 2016
    Location
    Melbourne
    Age
    35
    Posts
    1,522

    Default

    That's very impressive, really quiet even at the high speed.

  7. #22
    Join Date
    Aug 2011
    Location
    Melbourne
    Posts
    4,779

    Default

    I like it!

    Simon
    Girl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.

  8. #23
    Join Date
    Oct 2010
    Location
    melbourne, laverton
    Posts
    1,910

    Default

    hi shed
    you do great work mate. good on ya

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