Go/run like clockwork
Definition 1 of 1
Pro Tip 1/3Precision Timing
Used to describe something with accuracy and punctuality like a well-set clock. 
The train service in our country goes like clockwork; it's always on time.
Pro Tip 2/3No Obstacles
Suggests a process without interruptions or unexpected problems. 
Despite the tight deadline, the project ran like clockwork.
Pro Tip 3/3Effortless Success
Implies that success or smooth operation looks easy, even if behind the scenes it’s not. 
She managed the conference so well, it all ran like clockwork.