Manufacturing Piston Rings

The video tutorial explains the process of transforming steel and cast iron tubes into rings at a high rate while maintaining precise tolerances. It covers the grinding and polishing of rings with exceptional speed and precision, and the constant checking of precision. Finally, it describes how the rings are slotted to provide springiness and ensure they conform to the dimensions of the cylinder wall.

Why is the precision of the rings checked constantly?

What is the purpose of slotting the rings?