A worm gear with 85 teeth and a 0.2498 in. bore, designed to mesh with a 64-pitch, 14-1/2° pressure angle worm. The gear is made of Bronze QQ-B-637 Alloy 464 and has a pitch diameter of 1.3281 in. It is paired with a double-threaded 303 stainless steel worm, resulting in a 42.5:1 gear ratio. The bore accepts a #4-40 screw with a 0.375 in. mounting diameter and features a 7/64 in. counterbore for grub screws.
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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| Stock Drive Products & Sterling Instrument - SDP/SI | |
|---|---|
| Product Category | Gears |
| Product Number | S1C86Z-P064B085D |
| Product Name | 42.5:1 Gear Ratio, 85 Teeth, Worm Gear |
| Gear Type | Rack |
| Number of Teeth | 85 |
| Pressure Angle | 14.5° |
| Material | Bronze; AGMA Q10 / Bronze |
