2
$\begingroup$

This is my first robotics experience, outside of one class 10 years ago. I've been Googling this question for about an hour but I can't find an answer!

I'm using a ROHS Step Motor 28BYJ-48 (with an Arduino Uno). The rotating shaft that sticks out of the step motor seems to be called a "double-flat drive". It's less than 1/4" wide, and is flattened on two sides.

stepper motor

I need to attach a 6" long arm to it, so the arm can spin like the second hand on a wall clock, but in both directions. What can I use to attach the arm securely to the shaft? What's the name of the part that will couple this double-flat drive shaft to a straight, flat piece at a right angle to it? Or are there flat metal circles with holes in them that can be coupled to the double-flat drive shaft without slipping - and what's the Google search phrase I should use to find them?

Improve this question
$\endgroup$

1 Answer 1

Reset to default
2
$\begingroup$

You can use a D or Double D shaped shaft collar/coupler. Or obtain a Double D shaped punch, depending on the design of the piece you are attaching to the shaft.

Improve this answer
$\endgroup$
3
  • $\begingroup$ Thanks SteveO. The collar/coupler seems simplest to me, since the arm I'm attaching is a 1/2" square wooden dowel. However, the collars I've found online (Ruland, Amazon) seem to just create a cylindrical hole when attached to the shaft. How does the arm then get attached at a right angle to the collar/coupler? Or am I looking at the wrong kinds of collars/couplers? $\endgroup$
    – CreatedByBrett
    Feb 24, 2019 at 19:30
  • $\begingroup$ A ser screw could work, but you have to make sure it doesn’t back out. You can find D shaped couplers, such as this: robotshop.com/en/0770-set-screw-d-hub-6mm-bore.html $\endgroup$
    – SteveO
    Feb 24, 2019 at 19:40
  • $\begingroup$ Looks like a "mounting hub" is what I might need! Thanks for the guidance. $\endgroup$
    – CreatedByBrett
    Feb 24, 2019 at 19:46

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.