Which is a unit of measurement for feed rate?

Which is a unit of measurement for feed rate?

• A. Inches per revolution
• B. Inches per minute
• C. Millimeters per revolution
• D. Inches per hour

Answer: (A)

Feed rate describes how far the cutting tool moves along the work with each action of the machine. In turning and threading, the tool advances as the workpiece spins, so the natural unit is distance per spindle revolution. Inches per revolution exactly captures how far the tool moves for every complete turn of the work, which directly relates to the thread pitch and the resulting thread geometry. Using inches per minute would describe motion per time rather than per rotation and is more common for milling or table feeds, not the per-revolution control used in threading. Millimeters per revolution is the metric equivalent, but when the context uses inches, inches per revolution is the standard choice. Inches per hour would be too slow and isn’t a practical feed-rate unit.

Feed rate describes how far the cutting tool moves along the work with each action of the machine. In turning and threading, the tool advances as the workpiece spins, so the natural unit is distance per spindle revolution. Inches per revolution exactly captures how far the tool moves for every complete turn of the work, which directly relates to the thread pitch and the resulting thread geometry. Using inches per minute would describe motion per time rather than per rotation and is more common for milling or table feeds, not the per-revolution control used in threading. Millimeters per revolution is the metric equivalent, but when the context uses inches, inches per revolution is the standard choice. Inches per hour would be too slow and isn’t a practical feed-rate unit.