Curvilinear Profile
Arc Tooth Timing Belts

Our curvilinear profile arc tooth timing belts combine two design philosophies that are often treated as separate belt families: the rounded, backlash-minimizing tip of an AT arc-tooth profile, and a continuously curved tooth flank — rather than a flat or faceted flank — that eliminates the sharp stress transition points found in straight-sided tooth forms. The result is a tooth that meshes smoothly across its entire engagement arc, not just at the tip.

Material & Construction

The tooth flank is generated as a continuous mathematical curve (a modified involute-like arc) rather than a series of straight or circular-arc segments, molded in a low-creep polyurethane body reinforced with high-modulus steel or fiberglass cord. This continuous-curve approach removes the abrupt curvature changes that create localized stress risers in simpler tooth designs, distributing bending stress smoothly from tooth root to tip.

Design & Performance

Because the flank curvature changes gradually rather than abruptly, contact stress during meshing builds and releases smoothly across the engagement cycle, reducing the microscopic surface fatigue that eventually causes tooth-tip rounding in conventional arc-tooth belts. This translates into measurably longer backlash-stable service life in precision positioning applications, alongside quieter meshing than faceted tooth forms.

Manufacturing Excellence

Tooth molds are cut using CNC profile grinding to hold the curvilinear flank curve within microns of the design curve, verified afterward using optical comparator inspection on production tooling. Finished belts are checked against the same optical standard to confirm the curve carries through accurately from mold to molded part.

Customization & Flexibility

Available across the AT5, AT10, and AT20 pitch range with the curvilinear flank option layered onto our standard precision arc-tooth platform, so existing AT-pulley installations can typically be upgraded without a pulley change.

Applications Across Industries

Our curvilinear profile arc tooth timing belts are deployed in:

• Precision CNC Axes – long-service-life feed drive belts.
• Robotics – smooth, low-vibration joint drives.
• Optical Inspection Systems – vibration-sensitive stage drives.
• Semiconductor Equipment – extended-life wafer stage drives.
• Medical Imaging Equipment – quiet, precise gantry drives.
• High-Speed Packaging – smooth high-cycle-rate synchronization.

A tooth flank designed to mesh smoothly, not just precisely, pays off over the long service life that precision equipment actually demands. Smooth by design, precise by result.