Our manufacturing capabilities for ring gears cover a wide spectrum. We can produce modules ranging from 0.5 mm (fine-pitch gears for instrumentation and robotics) up to 40 mm (heavy-duty gears for mining and marine applications). For the tooth count, we are not limited by any theoretical maximum—we have manufactured internal ring gears with as few as 12 teeth and as many as 800 teeth for large slewing ring applications.
However, there is a practical relationship between module and tooth count for a given pitch diameter: the pitch diameter equals module multiplied by tooth count (Dp = m × z). For a fixed bore size, a smaller module gives you more teeth (finer resolution, smoother operation), while a larger module gives you fewer teeth but thicker tooth sections (higher load capacity).
Our engineering team can advise on the optimal combination for your specific torque, speed, and space constraints. We also offer non-standard modules and can manufacture ring gears to customer-specified diametral pitch (DP) values for imperial-system designs. Prototype quantities and large-volume production batches are both accommodated.