Question: A nine - speed gear box used as a head stock of a turret lathe is to provide a speed range of 1 8 0

A nine-speed gear box used as a head stock of a turret lathe is to provide a speed
range of 180 rpm to 1800 rpm . Calculate the progression ratio from the standard
series and the intermediate speeds.
A nine - speed gear box used as a head stock of a

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