Engineering moduleindicative

Internal Gears & Rack

Design standard

Calculation standard

Sets screening knobs for Indicative practice — not product type or catalog geometry

Handbook screening factors for shafts, gears, and rotating parts. Geometry and catalog type stay free.

Target SF 2.00Service factor 1.25

Reference standards

Machinery's HandbookShigley's Mechanical Engineering Design

Internal gear / rack

Lewis bending and Hertzian contact screening for internal spur or rack drives.

Gear type

Power

Pinion speed (rpm)

Module

Pinion teethRing gear teeth

Face width

Reference documentation

Standards, catalogs, and technical write-ups relevant to this module.

Candidate strategy

Typical Auto-design directions for internal gears & rack — compare light, balanced, and conservative sizing before committing to Validate.

Option	Basis	Pass	Tradeoff
Minimum size	Static strength	Screen fatigue	Compact but sensitive
Recommended size	Strength + stiffness	Pass expected	Balanced
Robust size	High reserve	Pass with margin	Larger and heavier

Continue workflow

Typical next steps after Internal Gears & Rack