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Help with gears/ratio/reducer

Discussion in '3D Printing' started by SilentChill, Feb 4, 2017.

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  1. adgun

    adgun Active Member

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    With a bigger pulley you need a longer belt to normaly, or shorten actuator stroke.
    With a shorter stroke he needs different gear math to.
    I adviced him a i=10 reduction to keep cost down and keep it simple
    Sorry for te bad english
    Regards Ad
    adgun, Feb 21, 2017
    #21
  2. SilentChill

    SilentChill Problem Maker

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    • Winner Winner x 2
    SilentChill, Feb 21, 2017
    #22
  3. adgun

    adgun Active Member

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    Not compleetly
    I did the math with youre motor in it
    Youre 10 turn pot will make 500rpm @ topspeed
    And this is the pot max shaft speed to (see tech spec sheet)
    I hope it last long!
    adgun, Feb 21, 2017
    #23
  4. SilentChill

    SilentChill Problem Maker

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    My motor probably running at around 90% top speed so I think it should be fine. I will get one and try
    SilentChill, Feb 21, 2017
    #24
  5. adgun

    adgun Active Member

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    This is made on rated speed.
    A belt needs tension, when this tension come on pot shaft its give a shorter lifetime.
    Try to take tension from potshaft with a second bearingblock upon pulley for example!
    • Like Like x 1
    adgun, Feb 21, 2017
    #25
  6. Mmcool

    Mmcool Member

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    • Agree Agree x 1
    Mmcool, Feb 21, 2017
    #26
  7. SilentChill

    SilentChill Problem Maker

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    Yes thanks been looking for some reasonably priced multi turn pots for a while but never stumbled across them
    SilentChill, Feb 21, 2017
    #27
  8. speedy

    speedy Well-Known Member

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    Any .stl files for something like this ...


    Worm_Gear.gif
    speedy, Mar 2, 2017
    #28
  9. Nick Moxley

    Nick Moxley Well-Known Member

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    • Informative Informative x 1
    Nick Moxley, Mar 3, 2017
    #29
  10. BlazinH

    BlazinH Well-Known Member

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    I know you’re trying out the 10 turn halls @SilentChill but to answer this from your first post,
    , I wonder if you could modify this 200:1 plastic gearbox by removing the motor and make them work with yours and a 1 turn hall pot somehow? They're only $5.75 each too.

    0J1094.200.jpg

    https://www.pololu.com/product/1120
    • Informative Informative x 1
    Last edited: Mar 3, 2017
    BlazinH, Mar 3, 2017
    #30
  11. Peacemaker105

    Peacemaker105 Active Member Gold Contributor

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    Any pics on your final product @SilentChill . See you got them sorted a while ago. How often did you break your wire wound pots btw? Im commited to the pots i have for now as this build is already hemeraging cash as it is haha but if they start to break I'll be def keen on converting to hall sensors.
    Peacemaker105, Oct 20, 2018
    #31
  12. Gadget999

    Gadget999 Well-Known Member

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    an alternative is to drop the potentiometer and use a shaft encoder instead

    get the arduino to count the pulses and convert them to one rotation using some maths

    i suggest 360 pulse encoder - if it turns 10 times for one main rotation you have 3600 pulses per revolution


    are you using the smc3 code ?

    maybe someone have converted one to read pulses instead of pot voltage already
    Gadget999, Oct 20, 2018
    #32
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