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  1. #41
    Quote Originally Posted by EddyCurrent View Post
    Fit a hand crank to the rear stub shaft of the stepper motor.

    That works on so many levels, a complete solution, I am truly in awe
    Last edited by Robin Hewitt; 26-04-2014 at 03:22 PM.

  2. #42
    Quote Originally Posted by Robin Hewitt View Post
    That works on so many levels, a complete solution, I am truly in awe
    Almost, but not quite. It just needs a solenoid-operated lever to give the user a slap on the wrist when the limit switch is triggered.

  3. #43
    Quote Originally Posted by Neale View Post
    Almost, but not quite. It just needs a solenoid-operated lever to give the user a slap on the wrist when the limit switch is triggered.
    Like me you are forgetting Gotama's advice to Siddhartha... "Beware of too much cleverness".

  4. #44
    When I was about 20 years old my work colleagues presented me with the (fictitious) Duke of Edinburgh Award for 'Use of Stone Age Tools'.
    Spelling mistakes are not intentional, I only seem to see them some time after I've posted

  5. #45
    Quote Originally Posted by Neale View Post
    Almost, but not quite. It just needs a solenoid-operated lever to give the user a slap on the wrist when the limit switch is triggered.
    Or, when the handle stops turning, you've hit the end stops.
    Spelling mistakes are not intentional, I only seem to see them some time after I've posted

  6. OK, here's version 0.1 for discussion....

    Click image for larger version. 

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  7. #47
    Quote Originally Posted by irving2008 View Post
    Tbh my approach just generates n pulses for each wheel pulse at a rate that's fast enough to finish before the next wheel pulse.
    As touched upon earlier, the 'jitter' this adds to the pulse stream will reduce the maximum feedrate somewhat as the motors wont run as smoothly. How much is hard to say, but it could be a problem...

    Quote Originally Posted by irving2008 View Post
    OK, here's version 0.1 for discussion....
    Direction required?
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

  8. #48
    More and more it looks to me that the best approach is a mechanical step-up! Trying to multiply the number of pulses electronically is inherently the wrong way to go.

  9. #49
    Fix the mpg down on a board and mount a larger mdf wheel next to it on an improvised pivot. Use a wide rubber band as a belt . Should be relatively easy to get a 5:1 step up.

  10. #50
    Quote Originally Posted by JohnHaine View Post
    Fix the mpg down on a board and mount a larger mdf wheel next to it on an improvised pivot. Use a wide rubber band as a belt . Should be relatively easy to get a 5:1 step up.
    Better still, connect the rubber band to the stepper motor to get a closed loop system. I'm sure you'd get positive feedback for that idea ;)
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

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