The ball will swing left and right in the grid

Roulette Bias
1

I saw in the casino roulette wheel that after the ball landed in the pocket,
the ball would swing left and right in the pocket. What is the reason for this?
When the rotor speed slowed down, the swing disappeared.

2

First, we need to know the terms correctly. I assume grid means pockets/frets. I think what you describe is normal for a too fast rotor, faster than 2.2s rotor.

3

4.5s-5.5s rotor，
6s rotor stops

4

Thats likely to be sweet rotor speed. Good for vb. Bad for bias

5

You mean slow rotor speed is bad for bias?

6

No, there exist a certain rotor speed that the scatter is minimal, somewhere around 3.5s, different for each wheel, which is bad for bias becasue the momentum of the ball and rotor just cancel out each other and the scatter is minimal.