I'm trying to set up a bicycle powered machine (grain mill), and I want to drive a 5/8" diameter shaft with a standard bicycle chain. I'm trying to find a sprocket that is 5/8" bore that fits a bicycle chain. I've tried 3 separate ones on Amazon and all of the sprockets are too wide for a standard bicycle chain. Does anyone know where to get a sprocket like this?
If your grain mill is a prototype, I would make a sandwich of steel plates (ie really big washers) and clamp it all together.
| <-- sprocket | | | <-- two steel plates ==||=|=|=|======= <-- shaft | | | |
Getting the alignment perfect might be hard and require tweaking, but this temp solution allows you to undo it and make adjustments.
Consider welding it in place. - this would have to be perfect, and it does make replacement of the cog difficult. But it won't move or slip on you!
Final thought - if you don't want a rigid shaft, consider cannibalising a freewheel or freehub. I'd consider slapping a whole freewheel cassette on, and using an appropriate gear. This way the machinery can move forward on the freewheel but not backward. Clamp it up between two cone nuts on the threadded shaft.
You can use more smaller sprockets, it's have pitch 1/2" or 1/4". I think you can buy it from bike shop. If you can't find it, you can ask me. My website is www.besbe.com, we're make sprocket manufacturer，hope help you.