Correct option is C
The
rigidity of the fixture is
not a primary factor for selecting the
cutting speed and feed rate in reaming. While fixture rigidity is crucial for accurate and stable machining to prevent vibration and misalignment, it does not directly influence the selection of speed and feed. The cutting speed and feed rate for reaming depend mainly on the material being reamed, the diameter of the reamer, and the reamer material.
Factors Affecting Cutting Speed and Feed for Reaming:
Material of the Job (Workpiece): Softer materials like aluminum allow higher cutting speeds, while harder materials like stainless steel require lower speeds.
Diameter of the Reamer: Larger reamer diameters require lower speeds to maintain optimal cutting conditions and avoid tool wear.
Material of the Reamer: High-speed steel (HSS) reamers typically operate at lower speeds compared to carbide reamers, which can withstand higher speeds due to better heat resistance.
