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C-Beam Linear Actuator Torque Rating

Discussion in 'General Talk' started by Andrew Hampton, Apr 28, 2016.

  1. Andrew Hampton

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    I recently bought the C-Beam Linear Actuator from the Part store. I was wondering what the torque rating is for this actuator. In my application it is vertical supporting a beam to the plate. At the end of the beam there is a weight and i was wondering if the motor will be able to handle this weight.

    Thanks,
     
  2. GrayUK

    GrayUK Master
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    Give us a clue?
    What's the weight?
     
  3. Andrew Hampton

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    The weight is 34 lbs.
     
  4. Rob Taylor

    Rob Taylor Veteran
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    Rick 2.0 likes this.
  5. Andrew Hampton

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    What were those estimated numbers? Think I am lifting is 34 lbs but it's 1.5 ft from the actuator. So the torque would be atleast 51 ft-lbs
     
  6. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    You're mixing two different concepts here. The torque caused by the load at the end of the beam is resolved by the gantry wheels locked into the C-beam. The stepper itself merely lifts a pure vertical load. Torque from the stepper is in turn lifting that load.
     
  7. Andrew Hampton

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    So it will work you think?
     
  8. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    Hard to say. The stepper will lift the load but I have a feeling you'll over stress the wheels.
     
  9. Rob Taylor

    Rob Taylor Veteran
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    Yeah, the stepper is the one imparting the torque, the screw is a conversion mechanism into linear motion, whereby the torque becomes a force, proportional to the diameter of the screw (hence the linear measurement in the units oz-in and Nm) and modified by some vector trigonometry based on the angle of the threads (the motor's turning sideways, gotta figure out how much of that converts to linear force, just like gravity acting on a car on a hill).

    The calculator inputs are:

    Force: 34lb, since that's the weight you're lifting. For a CNC gantry, that would be the mass of the tool head plus any possible kickback.

    Diameter: 8mm, as far as I'm aware.

    TPI: 8, I believe.

    Coefficient of friction: I left it at 0.1, since it seemed about right from the chart.

    That resulted in a torque to raise the weight of 19.6 oz-in, which is well within a NEMA 17's capacity, usually they're around 40-80 oz-in.

    As for whether the wheels'll take it, not a clue. Maybe try replacing them with the extreme-V polycarbonate ones.

    Also, if your 34lb is 1.5ft directly horizontally outwards from the actuator, you need a gantry reaching out to it that can take the 51ft-lb, and add that weight to the total the motor is pulling too.
     
  10. Andrew Hampton

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    Well we are using NEMA23 so I think we are well over capacity. Just not sure about slip
     
  11. Metalguru

    Metalguru Master
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    How about a sketch so we can see what you are up to?

    If you are hanging a 34 lb weight out on the end of a 1.5' arm that is attached 90 degrees to the C-Beam gantry plate, (like a gallows) I doubt very much that the v-wheels (even the extreme wheels) or the m5 screws supporting the v-wheels would hold up. They are not designed to have twisting torque applied to them.

    If you were using a vertical c-beam to lift a weight straight up, it should not be a problem.
     
  12. Andrew Hampton

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  13. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    Andrew, the images didn't come through. Try drag & drop with the files.
     
  14. Rob Taylor

    Rob Taylor Veteran
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    Gotta upload an image before you can embed it, that filepath is your local machine. "Upload File" is next to the "Post Reply" button.
     

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