chain transmission

Hello, yes you can use any sprocket or belt pulley that you like. I found that the LX belt had too much stretch for J3 so that is why I chose the chain, but if you upsized to a larger beltsmay work just fine.

I would have three more questions

1. Is this chain drive too loud?

2. Is there a problem with chain tension? I understand the tension by moving the engine on the beans

3. Is it possible to buy a ready control somewhere or six axes under the robot

No issue with chain drive noise, Ive re-tensioned once after a break in period and it keeps position fine. I dont understand the third question about six axes under robot, can you elaborate?