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Ground Spiral Bevel Gear

Ground Spiral Bevel Gears for High Speed and Low Noise, Finished After Hardening to Restore Accuracy and Tooth Contact.

Specifications
Gear Type	Spiral bevel, shaft angle 90° unless the drawing says otherwise
Made To	Customer drawing, CAD model or worn sample
Supplied As	Matched gear and pinion set, or single gear on request
Inspection Record	Dimensions, hardness and tooth contact on request
Finish	Tooth surfaces ground after hardening
Typical Use	High-speed and low-noise drives
Heat Treatment	Carburised and hardened, then ground

Why Grinding is Done

Heat treatment changes the shape of a gear slightly. Case hardening can leave the teeth a few hundredths of a millimetre out of true, which is enough to make a fast gearbox noisy. Grinding after hardening removes that distortion, corrects the tooth form and spacing, and leaves a smooth surface that carries load evenly. A ground spiral bevel set is the choice when speed, noise or accuracy matters more than the lowest price.

What Improves

Tooth-to-tooth spacing is more even, the contact pattern stays where it was designed, vibration drops and the set can run at higher pitch line speed. The ground surface also resists scuffing better in the first hours of running.

What it Costs and Takes

Grinding adds machine time and cost, and it needs enough case depth to leave material after grinding. We state the grinding stock when we plan the heat treatment so the hardened layer is still deep enough at the finish size.

When Lapping is Enough

For slower or moderate-duty drives a lapped pair, which is a hardened pair run together with fine abrasive, is often accurate enough and costs less. We will tell you which finish your drive needs and quote both when the choice is close.

See also: hardened spiral bevel gears and the guide on how spiral bevel gears are manufactured.

Frequently Asked Questions

Is a ground set always better than a lapped set?

Not always. Grinding gives higher accuracy and suits fast or quiet drives. A lapped set is entirely suitable for many mill, crusher and conveyor drives. The right finish depends on speed, noise limits and budget.

Does grinding reduce the hardened layer?

It removes a small amount of the case. We plan the case depth with that in mind so the finished tooth still has the specified hardness depth.

Can an old gear be re-ground?

Only if the case is deep enough and the wear is shallow. In most cases a new matched set gives better value than regrinding worn teeth.