voicecoils wrote:Another thing to look at would be the freewheel assembly that the nylon gears mount to. It may have a limited life as well. Nogwin is nearing 2k miles however, so he's our best torture tester yet IMO. The freewheel assembly cannot be disassembled from what I could see, so a bit hard to check the construction quality.
The freewheel mechanism in the Bafang looks well machined and durable. I have no concern about its durability thus far.
TPA wrote:Voicecoils says the bearing is the 608zz. I am considering making some gears out of 6061 aluminum. Can the bearing 608zz be confirmed with absolute certainty? And should they be shielded or sealed? Can anyone say whether it would be a good idea to increase the o.d. of the gear slightly to cut out the slop?
I would stay with the 1.25 module 28-tooth standard for now. With metal it is good to have a little play for thermal expansion.
The existing nylon gear is exactly a 1.25 module 28-tooth gear.
Also any bearing would do fine. It just needs an 8mm bore. It doesn't have to be a 608. But a sealed bearing is always preferred.
Just hearing today that a Chinese gear manufacturer (same as makes the metal gear for the PUMA) will make orders of 500 metal gears for the Bafang.
However, I would encourage a smaller startup batch and more testing first.
Now this is not the end.
It is not even the beginning of the end.
But it is, perhaps, the end of the beginning.