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BM-785HB Servo Gearbox

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Part
BM-785HB Servo Gearbox
BM-785HB Servo Gearbox
Status
In stock

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Price
$139.98
$139.98 - $169.98
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Details

The BM-785HB 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 BM-785HB can handle tremendous side loads with the dual ABEC-5 precision ball bearings which support the hardened 3/8” stainless steel shaft. The shaft is hollow with a .290” 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 3/8” clamping hub. The .770” clamping hub has 6-32 tapped holes which allow easy attachment of various components.  The frame of the BM-785HB is machined from 6061-T6 aluminum (anodized) and has 12 holes machined through the .147” thick bottom mount tabs for mounting purposes (.140” thru-holes to allow a #6 screw to be used). Patented

SPECS

Ratio

Maximum
Rotation

Weight
(oz.)

4.8V Torque
(oz-in)

6.0V Torque
(oz-in)

4.8V Speed  
(sec/60°)

6.0V Speed 
(sec/60°)

2:1

1413°

13.9

305.5

366

0.56

0.47

3:1

942°

13.86

458.25

549

0.84

0.70

3.8:1

744°

13.83

580.45

695.4

1.06

0.87

5:1

565°

13.86

763.75

915

1.40

1.17

7:1

404°

13.79

1069.25

1281

1.96

1.63

785 bottom mount1

 

Servo Included Yes
Voltage Range (Recommended) 4.8V -6.0V
Max PWM Signal Range (Standard) 600-2400 μsec
Travel per 1µs Signal Change (Standard Rotation) 1.57°
Max Travel (Standard Rotation) 2826°
Direction w/ Increasing PWM Signal Counter Clockwise
Internal Feedback Style 5KΩ Potentiometer
TECH TIPS

Want to try a different gear ratio on your Servo Power Gearbox?

Ratio

Servo Gear

Servo Gear
 Part Number

Hub Gear

Hub Gear 
Part Number

2:1

32T

615290

64T

615194

3:1

24T

615286

72T

615198

3.8:1

20T

615282

76T

615202

5:1

16T

615278

80T

615206

7:1

12T

615274

84T

615210

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