Question

In which of the following milling operations, the finished surface is at right angle to the cutter axis?

• A. Face Milling
• B. Down Milling
• C. Up Milling
• D. Peripheral Milling

Hint:

Visualize the orientation of the cutter and the workpiece in each milling operation. In face milling, imagine a flat-ended cutter rotating on an axis perpendicular to the table, machining a flat surface. In peripheral milling, imagine a cylindrical cutter rotating on a horizontal axis, machining a surface along its length.

Answer 1

The Correct Option is A

Step 1: Understand the different types of milling operations.
Face Milling: In face milling, the cutter axis is perpendicular to the surface being machined. The cutting occurs primarily by the end teeth of the milling cutter. This operation produces a flat surface that is at a right angle (90 degrees) to the axis of the rotating cutter. Down Milling (Climb Milling): This is a type of peripheral milling where the direction of cutter rotation is the same as the direction of workpiece feed. The chip thickness starts maximum and decreases to zero. The finished surface is typically parallel to the cutter axis. Up Milling (Conventional Milling): This is a type of peripheral milling where the direction of cutter rotation is opposite to the direction of workpiece feed. The chip thickness starts minimum and increases to maximum. The finished surface is typically parallel to the cutter axis. Peripheral Milling (Slab Milling): In peripheral milling, the cutter axis is parallel to the surface being machined. Cutting is performed by the teeth on the periphery of the milling cutter. This operation produces a surface that is parallel to the axis of the rotating cutter. Down milling and up milling are subtypes of peripheral milling. Step 2: Identify the milling operation where the finished surface is perpendicular to the cutter axis.
From the descriptions above, face milling is the operation where the flat surface produced is at a right angle (90 degrees) to the axis of the milling cutter. Step 3: Match the surface orientation with the correct milling operation.
The question asks for the operation where the finished surface is at a right angle to the cutter axis. This is the characteristic of face milling.