Spur & straight-tooth gears
Common repeat-volume gear forms where pitch, tooth strength, density, bore features and finishing requirements drive the process route.
Custom spur, helical, bevel and feature-rich transmission parts should be evaluated from tooth geometry, torque, material, accuracy, wear, finishing needs and annual volume — not from a generic process label.
This family covers gears and compact transmission components used to transfer torque, change speed or direction, synchronize motion, or integrate drive features into a small metal part. The end product may be a tool, robot, outdoor machine, actuator or other OEM assembly; the manufacturing decision still starts from tooth geometry, load and required accuracy.
Common repeat-volume gear forms where pitch, tooth strength, density, bore features and finishing requirements drive the process route.
Angled teeth can improve smoothness and contact behavior, while helix geometry, axial load, accuracy and post-sinter distortion need closer control.
Direction-changing gears bring tooth geometry, concentricity, mounting datums and contact pattern into the manufacturing decision.
Gears combined with hubs, splines, dogs, cams or other 3D features may justify PM, MIM or a hybrid route when machining setups become inefficient.
“Powder metal gear” is not a complete process decision. Geometry, torque, required tooth quality, density, wear, material, heat treatment and annual demand determine which route is worth validating.
| Route | When it is worth evaluating | Watchouts |
|---|---|---|
| Press-and-sinter PM | Repeat-volume gears and transmission parts with press-friendly geometry and economics that benefit from near-net shape. | Compaction direction, density distribution, tooth strength, sizing, heat treatment and any surfaces that need machining. |
| MIM | Small gears or transmission parts with integrated 3D features that are difficult to compact conventionally or expensive to machine from solid. | Shrinkage/distortion, tooth-quality target, section balance, material condition and secondary finishing. |
| Machining / gear cutting | Low-to-moderate volume, tight tooth accuracy, simple billet route, prototype work, or parts dominated by precision surfaces. | Cycle time and material waste can become expensive at scale, but direct machining may remain the lowest-risk route. |
| Hybrid route | Near-net-shape blank plus selective machining, sizing, grinding or tooth finishing on critical datums and interfaces. | Define the datum scheme early so the molded/sintered geometry supports repeatable secondary operations. |
Key principle: choose the lowest-risk manufacturing chain that meets the gear function. A near-net-shape process is valuable only if it reduces total operations without compromising tooth performance, datums or service life.
SINTS gear examples show spur, helical and bevel tooth forms. Tooth geometry, loading, material and finishing requirements determine the manufacturing route.
Gear geometry for repeat-volume manufacturing.
SINTS gear reference
Helical-tooth gear geometry for transmission applications.
SINTS gear reference
Bevel gear geometry for changing drive direction.
SINTS gear referenceIdentify bore, hub, shoulder, face and tooth relationships that control runout, mounting or mesh.
Wear, lubrication, corrosion, noise, impact and duty cycle influence density, material and finishing choices.
Heat treatment, sizing, machining, grinding or coating should be included in the route from the beginning rather than added after tooling.
Tooling only makes sense when geometry and repeat demand justify it. Prototype and low-volume gears may remain better machined.
Drive trains where torque, reversing, outdoor wear and noise matter.
Application guide →Reduction stages, sector interfaces and high-torque compact mechanisms.
Application guide →Cordless drive gears, cams and ratchets under repeated cycles.
Application guide →Rack, pinion and small synchronization gears where backlash and wear affect repeatability.
Application guide →Use the family page for route selection. Use these retained detail pages when the tooth form itself changes the engineering questions.
Axial tooth geometry, load, accuracy and PM/MIM/gear-machining trade-offs.
Detailed guide →Helix angle, axial thrust, contact behavior, distortion and finishing.
Detailed guide →Direction-changing geometry, mounting datums, contact pattern and route selection.
Detailed guide →Share tooth geometry, material, critical datums, load/torque, annual volume and any heat-treatment or finishing requirements. We can compare PM, MIM, gear machining and hybrid routes.