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Does anyone torque their DIY linear actuator? if so how much ft-lbs?

Discussion in 'Motor actuators and drivers' started by hannibal, Jul 2, 2019.

  1. hannibal

    hannibal Active Member

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    i see videos of commercial screw ball applications where the technician torque the spider tooth motor coupler..

    im just curious if anyone tightens their coupler to a specific value...
    or at least have a minimum value so that the motor and coupler do not run out the ball screw and avoid stripping it..
  2. My.stAr

    My.stAr Active Member

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    The necessary torque depends on the shaft, coupler and the screws you have. If the shaft is flattened you'll need way less torque. Also if it's with tongue and groove. I have a coupler with an allen screw which goes directly to the shaft (not flattened). I didn't measure the torque, but don't think that I tightened it more than 20Nm... (15 ft lb).

    As you said, you can break the screw or risk slipping. What strength does your screw have? 12.9? 6.8? The higher the number, the harder you can tighten it. What shaft diameter do you have? Where are the screws placed? You cannot just take someones value and use it for your coupler...
    The secure way is to tighten it reasonable and if it slips, just tighten it harder ;)
    Or look it up in the data sheet, maybe it's there?
    • Informative Informative x 1
  3. hannibal

    hannibal Active Member

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    @My.stAr i have the Sfu1506 in 500mm like most ppl... i just ask her to get a general idea!
  4. My.stAr

    My.stAr Active Member

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    I think you have a 1605, not 1506:p
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