5.0-785HB-.5 Servo Gearbox

The servo to be combined is sold separately and can be selected by clicking here

Continuous rotation gearbox


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The 5.0-785HB-.5 Servo Gearbox utilizes the Hitec HS-785HB sail winch servo (included) to create a high-torque Servo Gearbox. The stock Hitec servo can rotate several turns in factory form (approximately 4 turns on most Tx/Rx systems; up to 8 turns with a 650-2350usec signal). When the servo is installed into the gearbox, the total amount of rotation is decreased by the ratio selected but the torque and precision is increased by the ratio. The lower the gear ratio, the more precision and torque it will provide but the speed and amount of rotation will be decreased.  Five different gear ratios are available in order to find the right balance between torque and rotation. Positioning feedback remains since the servo is completely stock and unmodified in any way. The 5.0-785HB-.5 can handle tremendous side loads with the dual ABEC-5 precision ball bearings which support the hardened 1/2” stainless steel shaft. The shaft is hollow with a .382” inner diameter to allow wires from cameras, sensors or other devices to not tangle during multi-rotation movements. The brass pinion gear meshes to a high-grade 7075 aluminum 32 pitch hub gear which is fastened to the output shaft of the gearbox with a 1/2” clamping hub. The .770” clamping hub has 6-32 tapped holes which allow easy attachment of various components.

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