The gear attached to the motor of the rotary signboard has gone away.
Standards are also listed in detail and there was a substitute item so order immediately.
The size is also perfect! It is! I turned around as if nothing had happened.
I am satisfied with the gear itself. Moreover, I think that it is good to be able to combine various numbers such as the number of teeth, module value, diameter, thickness etc. However, at the same time as the spur gear, there seemed to be a limit in combination with the internal gear, and it was a bit difficult.
I used it as a correction gear for printing, but machine makers made it for each size, but because it was easy to arrange it thankfully I got thank you but thank you for the inside diameter is φ12 · 20 and the outside diameter is large I am grateful if there is.