Is my power supply sufficient enough?

Robin2:
That sounds like a mechanical problem.

Please post a diagram that shows the actual arrangement of the lock.

Maybe (for security) it is a good idea that it cannot move when it is being abused?

...R

Tnx sir.. i have fix that issue..
i have an AC motor of the dryer from washing wachine and i am controlling it with arduino and relay.. my problem now is that its RPM is too fast (900RPM) and i want to reduce to 100RPM.. any suggestions sir on how i could do that?