I have some car window motors that I would like to directly couple to some roller-type shades in my house. I would like to introduce a direct coupling mechanism rather than use some sort of chain.

In a car these motors are used in a rack-and-pinion configuration, with the pinion gear on the motor and the rack gear on a scissor mechanism: enter image description here

Here are some photos of the motor and the gear. I have not been successful in removing the gear without opening and damaging the worm-gear enclosure (a greasy mess): enter image description here

My proposal is to make a coupler out of steel or brass dowel pins: enter image description here

Does this seem like it would work? Do people use couplers like this? I have a small Taig lathe and a little CNC that I can use to place the dowel pin holes and make the coupler.

  • $\begingroup$ your idea is doable ... a 6 point wrench socket might be a simpler solution $\endgroup$
    – jsotola
    Commented Apr 15, 2023 at 3:39
  • $\begingroup$ your questions seek opinions ... that is off topic here $\endgroup$
    – jsotola
    Commented Apr 15, 2023 at 3:40
  • $\begingroup$ get a few more window motors and get the gears of them to do a 1:1 drive. $\endgroup$
    – Solar Mike
    Commented Apr 15, 2023 at 7:57
  • $\begingroup$ I'm not seeing the 6-point wrench solution. Seems this would require a coupler with 7 sides? $\endgroup$
    – user391339
    Commented Apr 19, 2023 at 23:09


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