KDG0.5-20R2 is a plastic worm wheel with a module of 0.5, 20 teeth, two starts, and a right-hand helix angle of 5°13'. It has a bore diameter of 4 mm, a hub diameter of 9 mm, a pitch diameter of 10.04 mm, an outside diameter of 11 mm, a face width of 5 mm, a hub width of 7 mm, and a total length of 12 mm. The material is polyacetal, with a permissible torque of 0.067 N·m (0.0069 kgf·m) and a backlash range of 0-0.16 mm. The weight is 1.01 g. The gear is profile-shifted to ensure proper center distance, and the bore is finished with a minus tolerance to allow for force fitting.
Module 0.5, 20 Tooth, 2 Start, Right Handed Polyacetal Worm Gear
A worm gear pair, or worm gear set, consists of two gears: the worm, which resembles a spiral screw, and the worm gear (aka, worm wheel).
For the pair to mesh, the worm and worm gear must have the same pressure angles, modules, and lead directions (left- or right-hand).
A worm revolves on a shaft that’s perpendicular to the worm gear and the shaft angle is typically 90°. Because the teeth gradually mesh as the worm rotates, there is low noise and low vibration.
For more about worm gear mesh geometry follow this link.
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| QTC METRIC GEARS | Stock Drive Products & Sterling Instrument - SDP/SI | |
|---|---|---|
| Product Category | Gears | Gears |
| Product Number | KDG0.5-20R2 | KDG0.5-20R2 |
| Product Name | Right Hand Lead Worm Gears (metric) | Module 0.5, 20 Tooth, 2 Start, Right Handed Polyacetal Worm Gear |
| Number of Teeth | 20 | 20 |
| Design | Metric | |
| Pressure Angle | 20° | 20° |
| PD | 10 mm (0.3937 inch) | 10 mm (0.3937 inch) |
