Depth for countersink drilling is defined by the start surface and the countersink diameter value, entered when defining the Hole Set. Instead of entering a countersink diameter, you can specify that the system automatically finds all the applicable chamfers and makes the necessary calculations.

Countersink diameter is the final diameter of the hole after drilling, measured in the start surface. The countersink diameter cannot be larger than the tool diameter. Tool parameter POINT_ANGLE defines the chamfer angle. These preceding two rules are used to find applicable chamfers automatically.