What data is needed to make a custom spur gear?
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- Issue Time
- Sep 3,2026
Custom spur gear data: define the mesh before the blank
To make a custom spur gear, provide the tooth system first: module or diametral pitch, tooth count, pressure angle, face width, and any profile shift. Then add outside diameter, bore or spline/keyway details, mating-gear information, material and heat treatment, load and speed, quantity, and inspection targets. A sample is useful, but its worn dimensions should not be treated as the original design.
What to define before making a decision
The mating gear and mounting condition are essential because a gear that matches only the outside diameter can still have the wrong tooth form, center distance, backlash or shaft fit. State whether the gear is external or internal, the required ratio, hand or helix only when applicable, the datum surfaces, runout limits and any agreed profile, lead or tooth-thickness measurement method.
For a drawing-led review, PairGears gear product categories can provide useful product context. PairGears should receive the mating-part and operating details before any replacement or production decision is made.
Example and practical check
For a 24-tooth replacement spur gear, the useful record is not simply “24 teeth.” It should identify the module or DP, pressure angle, face width, bore and keyway or spline, mating gear, center distance, material condition, heat-treatment requirement and the failure that prompted replacement. That lets the drawing review separate a tooth mismatch from a shaft-fit or lubrication problem.
