Building a reduction gear techniques

[Kiza]

Today I learned that sprockets do not weld well to mild steel...

I've got it holding for now, so I will see how long it lasts. I've added more tacks since the photo.
The plan is to put two thrust bearings on each side and put a bolt through the middle to bolt it to the frame.

My other attempt was to buy a roller sprocket from Aliexpress.

I was going to buy two and weld them together but only 1 came in the right chain spec. It was a long wait and being only seller of these I didn't know if I would get the right parts after another month wait so I decided to try the method above.

Does anyone have any other suggestions for cheap and easy reduction gear implementations?

 

[amberwolf]

First, what exactly is your project and needs? There may be some other solution we could help you work out, or a better / different way to do the one you're already doing.


That said, steel sprockets generally weld fine to mild steel...but if the steel has a coating (like if it's galvanized) it may have to be removed first. It may require higher current than you're using to get a deep enough weld, however.

 

[Kiza]

I'm going for a 1:7ish gearing reduction for the QS 3kw mid drive. Trying to avoid putting an massive sprocket on the back wheel.

Interesting about the sprocket welding - maybe I need to tweak my welder settings but I think it should hold for now. I did take off the coating in the area before I tried welding it.