On Thu, 27 Jan 2022 at 06:49, Ralph Stirling <[email protected]> wrote:
> I had some problems today with a small XL timing > pulley slipping on a NEMA17 stepper shaft due to > the set screw loosening after running for long > periods (multiple days). I drilled and tapped a > second set screw hole, and I can probably apply > some thread locker, but I got to wondering if it > would be possible to make a miniature taper lock > type bushing and pulley to clamp onto a stepper > shaft. Anybody ever seen anything like that? > > The original taper lock system has a split bushing > with an 8 degree taper against the pulley. They > also have a clever set screw arrangement to tighten > the pieces together and to jack them apart when > removing. If you haven't used them before, a video > is the best way to understand them: > https://www.youtube.com/watch?v=-3K_vf_7fhM > > I like to 3d print my timing pulley perimeters, but > a metal hub is nice (as has been discussed on here > in the past). I'm pondering how I could make hybrid > pulleys with a taper locking hub. Threading the holes > in the plastic pulley wouldn't work so well. Perhaps > some threaded metal insert can be incorporated from > the back side. > > Enough of my musings. Looking forward to hearing > other ideas and suggestions. > > -- Ralph If you're 3D printing a larger pulley, you could do something as in the pic. You drive a self-tapper into the small hole on the left to clamp the flexure. Add more screws/holes as needed. Roland
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