The table below shows typical hole geometries.
To machine these kinds of holes efficiently and economically, it is important to know the type of machine method used and to select the correct tool to suit the operation.
A hole that does not exit the work on the opposite side.
A hole that goes through to the opposite side of the workpiece.
A hole that has a chamfered in. The hole is stepped at the point where hole diameter changes.
A hole that is drilled into a cone shape.
A hole that is threaded.