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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.

Difficulty: Easy

Arithmetical progression (constant difference)
Geometrical progression (constant ratio)
Harmonic progression
Any of the above equally likely

Correct Answer: Geometrical progression (constant ratio)

Explanation:

Concept
Stepped 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 Answer
Geometrical progression (constant ratio).

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