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Looking for a motor coupling, 19mm to 10mm for SFX 100

Discussion in 'Motor actuators and drivers' started by Moe Colontonio, Feb 9, 2021.

  1. Moe Colontonio

    Moe Colontonio Member Gold Contributor

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    Hiya guys. I'm building a set of SFX 100s to move a heavy rig (600+ lbs). I've got the SFX100s built, and bought 110ST motors and made adapters to mount them. The last piece of the puzzle here is to find some shaft couplings. The 110ST has a 19mm (3/4") shaft, and the ball screw shaft on the SFX100 is 10mm.

    I've been searching high and low, and the only couplings I could find for 19mm to 10mm are very expensive oldham type couplings. From McMaster I'm looking at $91 per coupling!

    Any advice here is appreciated.

    TIA
  2. Ads Master

    Ads Master

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  3. John Beardmore

    John Beardmore New Member

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    Turn a spacer for the end of the screw to increase its diameter. I would guess it’s easier to find a 19 to 19 coupling.
    Use Loctite 638 to hold the spacer in place. It has a shear strength of around 25 N mm2.
    I am holding the quick release onto my small mige with it for my steering.
    • Like Like x 1
  4. Daguru

    Daguru Rally drivers do it in the Dirt

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  5. cfischer

    cfischer Active Member Gold Contributor

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  6. Moe Colontonio

    Moe Colontonio Member Gold Contributor

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    In the end, I bit the bullet and spent $360 on US made Oldham style modular couplings. The downside is they will require me to cut down the motor shafts, which isn't much of a deal I've done it many times before. The upside is they will last a lifetime...