Lathe design: progression of available spindle speeds Many engine/toolroom lathes use a stepped speed box. Identify how the series of spindle speeds is typically arranged.
Mechanical Engineering
Production Engineering
Difficulty: Easy
Choose an option
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AArithmetical progression (constant difference)
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BGeometrical progression (constant ratio)
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CHarmonic progression
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DAny of the above equally likely
Answer
Correct Answer: Geometrical progression (constant ratio)
Explanation
ConceptStepped speeds are chosen in geometric progression so that surface speed changes in a fixed percentage step, which better matches cutting-speed recommendations across diameters and materials.
Final AnswerGeometrical progression (constant ratio).