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I Only Have Motor Specifications, How Do I Choose a Gearbox?

Start with Motor Power, Narrow the Range by Interface & Equipment Requirements, Then Verify the Final Selection with Engineering Calculations. This Tool Identifies Candidates, It Does Not Replace Torque, Inertia & Service-Life Calculations.

Common Applications

Motor Power → Gearbox Frame Size

Initial Selection by Common Application; Other power ratings do not automatically use the frame rule.

Required Output Structure?

Approximate Output Torque Range

Accuracy Requirement

Motor Interface(Enter If a Drawing Is Available)

Input Shaft Diameter, Locating Pilot, Mounting Hole Spacing. Leave Blank to Select Initially by Application & Frame; When entered, only candidates with matching interface data are shown.

Shaft Diameter mmPilot Diameter mmHole Spacing mm

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Select Conditions on the Left

Select Application & Motor Power, Then Add Structure Requirements as Needed, Torque, Accuracy & Interface Conditions.

INTERFACE CHECK

Before Ordering, Check at Least These 4 Items

Even at the Same Rating 750W Servo, Different Brands, Shaft and flange dimensions may differ across series.

① Motor Shaft Diameter

Determines bushing or clamping compatibility.

② Shaft Length / Keyway

Prevents shaft bottoming or insufficient clamping length.

③ Locating Pilot

Locates the motor concentrically with the gearbox input flange.

④ Mounting Hole Spacing

Confirm that mounting bolt holes align.