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  • Help with pulley and belt system

    Discussion in 'The main mechanical design forum' started by AriLiquids, Aug 28, 2013.

    1. AriLiquids

      AriLiquids Member

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      I am over my head on this and I have a new prototype deadline to meet and am floundering. Please someone throw me a life preserver.

      We have a spinning cylindrical brush that is to have the motor mounted underneath it to save space on the side.

      Here are the terms:

      Need engineering to set the terms for a two-pulley power train to drive a brush spinning at about .8 Nm 2,500 rpm, from an electric motor at about 25,000 rpm can change this if you want. Must be extremely thin profile, perhaps a urethane band non-reinforced. Some thinners and water in environment.

      1. What size pulleys and belt do I order?

      2. How do I mount them?

      3. What do I do about stress pulling the axle of the brush toward the pulley?

      4. Preferably burn out belt before motor if the brush gets stuck?

      5. Can I do this with a 12 volt DC motor or will I need mains?

      Thank you so much!

      Ari Tanz
       
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    3. mechaboy

      mechaboy Active Member

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      hello there
      what is your dimensions limitation?
      can you give me a hand sketch of what you wanna make?
       
    4. AriLiquids

      AriLiquids Member

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      Thank you Mechaboy.

      Here's a sketchup image. The pulley has to be as close to the brush as possible in order to use it effectively. I would love less that 17 mm, but maybe that's a no-go!

      Thanks for the quick response.
      Ari
       
    5. AriLiquids

      AriLiquids Member

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      Hey, where's that picture?

      [​IMG]
       
    6. AriLiquids

      AriLiquids Member

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      My picture won't go through.

      I want the motor underneath the brush like this:

      brush: XXXXXX O pulley
      motor: XXXX 0 pulley

      with 50 mm between the two axles. I would like the pulley to stick out less than 20 mm from the end of the brush if possible.

      Thanks!
       
    7. AriLiquids

      AriLiquids Member

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      Let me try again with the picture:

      [​IMG]
       
    8. mechaboy

      mechaboy Active Member

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      how about gears?
      do you like to use gears instead of pulley?
      they are better in small sizes.
      about motor i need more time to find a good one.torque and speed are hard to match.
       
    9. AriLiquids

      AriLiquids Member

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      This is where it gets tricky.

      Gears might be noisy but so what...except for one big thing: the gear on the brush end may have to be too big.

      I want the gear on the brush end to be less than 30 mm. but if it is going to reach ALL THE WAY DOWN to the motor underneath it, then it will be huge. And it will stick out in the front and the project will not work.

      You're still going to need something like 10 or 15 to 1 to get the speed of a normal motor down to the 3,000 rpm I need.

      That's why belts looked best. They are used by Dyco for exactly the same thing, spinning a brush from underneath, in a vacuum. For some crazy reason Dyco uses a 240 volt DC motor for that. It looks like much less rpm's.

      Motors just have to be geared, because they don't have the power straight out, right?
       
    10. mechaboy

      mechaboy Active Member

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      yes
      i looked for a suitable motor but i couldn't find.the power of motor that you need is 261.66 W or 0.35 hp that it is too high for small motors. small pulley needs a thin belt that in high speeds will shake and its not good.because of this reason in servo motors production gears are in use.you can find too small gears for your machine.i couldn't find small motor for you.you must ask some one else to guide you.:(
       
    11. AriLiquids

      AriLiquids Member

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      Wow Mechaboy you really helped. Thanks so much!

      Thanks so much especially for the news about the shaking belt.

      Ari

       

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