Motor Speed =

Machine Spd =

Roll Diameter =

Gearbox Ratio =

Roll Speed =

Computes the Gearbox Ratio for a given roll based on the Motor Gear-in Speed, Machine Line Speed and Machine Roll Diameter. Also, computes Machine Roll Speed based on the Motor Gear-in Speed and the computed Gearbox Ratio.

- Motor Speed: in revs per minute

- Machine Speed: in feet per minute

- Roll Diameter: in inches

- Gearbox Ratio: Dimensionless

- Roll Speed: in revs per minute

Contributed by Jerry Meyer.

A paper machine will be driven by 1200 rpm motors and the machine speed will be 3500 fpm. Calculate the gearbox ratio for a 40.16 inch diameter roll.

Answer: 3.6047

Motor Speed

Machine Spd

Roll Diameter

Gearbox Ratio

Roll Speed

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