4-step option method for S series helical gearbox

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Step 1 – Define your duty

Load type: Uniform / Medium shock / Heavy shock?

Daily operating hours: ≤10 hrs or >10 hrs?

Starts per hour: How many start/stop cycles?

Step 2 – Calculate your requirements

Ratio = Input RPM ÷ Required Output RPM

Required torque = (Power × 9550 × Ratio × Efficiency) ÷ Input RPM

S Series efficiency: higher than plain worm gearboxes (helical stage improves efficiency)

Step 3 – Apply service factor

Uniform load, 10 hrs/day → SF 1.0 – 1.2

Medium shock, 10 hrs/day → SF 1.2 – 1.5

Heavy shock, 10 hrs/day → SF 1.5 – 1.8

Adjusted Power = Required Power × SF

Step 4 – Match to model

Find the smallest S Series model that meets:

Required torque ≤ Rated torque (with SF applied)

Required ratio available in standard range

Models: S37, S47, S57, S67, S77, S87, S97