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Worm Gear Selection Guide

Ratio, torque, speed, starts, helix hand, center distance, duty cycle and service factor for custom worm gear RFQs and design review.

Worm Gear Selection Guide illustration
This guide is general engineering context, not a substitute for application-specific calculation, drawing approval or a machine safety assessment.

Define the operating point

Start with input speed, output torque, peak torque, duty cycle, starts per hour and reversing. Ratio alone is not enough.

Confirm geometry

Module or DP, starts, helix hand, center distance, wheel teeth, pressure angle/profile and face width must be compatible.

Check service factor

Daily operating time, shock classification, starting frequency, ambient temperature and jamming events change the required margin.

Review sliding and heat

Worm gears generate sliding friction. Efficiency and thermal capacity depend on lead angle, speed, lubricant, materials and assembly.

Plan bearings and housing

Axial thrust, overhung loads, shaft deflection, center distance and housing stiffness affect contact and life.

Validate holding behavior

Do not rely on self-locking for safety. Use an independent brake or lock where needed.

Recommended review sequence

  1. Confirm the machine function and operating duty.
  2. Identify the tooth system and installed geometry.
  3. Check load, speed, sliding, temperature and service factor.
  4. Select materials, heat treatment, lubrication and inspection requirements.
  5. Review shafts, bearings, housing, guards and failure consequences.
  6. Issue and approve the final manufacturing drawing.

General context derived from connected worm gear catalogues and current official standards information. Product-specific values must be calculated for the actual design.

Need a drawing review?

Email the RFQ package to [email protected].

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