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Heavy load for V-Slot belt driven Linear Actuator

Discussion in 'Other Builds' started by Richbh, Jan 27, 2019.

  1. Richbh

    Richbh New
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    Hi guys

    I’ve watched the build video for the V-Slot belt driven linear actuator (link at bottom of this post). I think the principle is perfect for my application, which is to automate a sliding door, but I have some questions whether it is strong enough and wondering if there are additional components that could be used to modify to suit better. Any help much appreciated:

    1. My sliding door is mounted on an independent track which takes the whole weight of approx 100Kg so I can move it with my little finger once it’s moving, but it does need a little more force to get it started. I’m wondering if the belt and/or motor in the video would be strong enough or if there is a larger version.

    2. I want the door to move real slow. Say 3cm per second. Is there a gearbox that can be used with the motor to reduce speed?

    3. I need to make sure that if the door jams against something (eg the cat!) and when it reaches the end stops that the motor switches off based on a torque switch. Is a component available to do this? Perhaps limit switches are better for the end stops?

    4. I need the track to be 14m long. Can sections be joined together? And would this length give problems with belt stretch?

    Help on these questions much appreciated.

     
    #1 Richbh, Jan 27, 2019
    Last edited: Jan 27, 2019
  2. Anthony Bolgar

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    I think you would need a much larger belt to be able to manipulate a heavy door like that over 14 meters.
     
  3. MaryD

    MaryD OpenBuilds Team
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  4. Ronny Roos

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    Hi All, sorry to jump in to this, but I’m facing a similar problem with potential high weight and resistance.

    I’m in the starting phases of a project where I need to move approximately 5kg of weight over 300mm with speeds upwards of 600mm/s

    I intend to drive this with the ODrive, which is basically a powerful hobby motor with an encoder on it, I figure this should give me the power and speed needed.
    However, I have concerns that the belt would slip due to weight and resistance. Should I be looking at leadscrews (according to my calculations there would be too much whip in them at these speeds and distances)?
     
  5. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    You might look into belts and pulleys with heavier profiles to keep them from slipping. Going wider may also be helpful.
     
  6. Ronny Roos

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    Yeah, I have used wider belts for other builds but never this long belts.

    Any ideas where to get them? (Europe)
     
  7. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    Sorry I'm in the US so I'm not familiar with what Europe has to offer. If I were looking internationally though I would probably just go with Powge.
     
  8. Alex Chambers

    Alex Chambers Openbuilds Team
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    300mm (if that's what you meant) is not long for a leadscrew, but acceleration may be a a problem.
    Alex.
     
  9. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    When you look at the RPM required to achieve 600mm/s lead screws are a non-starter. It's even questionable if it can be achieved with pulleys based on the load requirement.
     
  10. Ronny Roos

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    Hi!

    Did you look into the ODrive? I think it should be capable of those RPMs, but this is based purely based on my rough understanding and assumption that I will find a good BLDC motor that will do the job.

    Any other types of linear motion mechanisms I should consider? I’ve looked at “real” actuators, but haven’t found any that fits this area (either too weak or too slow)
     

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