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785 Gear Rack Kit (Dual Parallel)

  • The included beam brackets are constructed of wear-resistant Delrin
  • This kit incorporates our patented direct mount servo gears
  • Mount in a horizontal or vertical orientation
  • The beam gear racks have 118 teeth
  • Up to 19.2” of travel
  • A simple and smooth linear slide system
  • Perfect for steering racks and other applications that require linear motion
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The 785 Dual Gear Rack Kit is a simple way to create linear motion using a rotational servo. The kit comes with the multi-rotation Hitec HS-785HB servo which allows for up to 9.6” of travel from each of the gear racks when sending the proper PWM signal from a servo controller. The kit is constructed of 6061 T6 aluminum components and wear resistant Delrin plastic to create a durable yet lightweight assembly. The framework has several mounting options and integrates seamlessly with the rest of the Actobotics line of products. The 785 Dual Gear Rack Kit is great for projects that require symmetric linear movement from a common center point using a PWM signal. All the hardware is included. For details on the assembly process, be sure to check out our assembly video.

Signal information: The HS-785HB servo rotates approximately 1.7 degrees/microsecond change in signal. To achieve full travel, a signal range from approximately 850-2150usec will be required (each HS-785HB servo responds to a signal slightly differently so you may need to fine-tune this range in order to achieve full travel without hitting the stops at the ends). On a standard RC transmitter and receiver (assuming a 1050-1950usec range) the Gear Rack Kit will travel approximately 6.7” in either direction. For details on the HS-785HB servo that drives the 785 Gear Rack Kit, click here.




615410 Schematic


(1) HS-785HB Servo #33785S
(1) Quarter Scale Servo Plate #575116
(1) Beam Bracket W (set) #585713
(1) 90 Degree Dual Side Mount (2 pack) #585596
(1) 90 Degree Quad Hub Mount B #545424
(12) 6-32 x 1/4” Socket Head Cap Screws
(4) 6-32 x 5/16” Socket Head Cap Screws
(4) 6-32 x 5/8” Socket Head Cap Screws
(4) 6-32 Nylock Nuts
(8) #6 washers
(1) 16T, 32P Metal Servo Gear #615278
(2) 32P Beam Gear Rack #615410
(2) 12.32” Aluminum Beam #585423
637190 785 Gear Rack Sideways Dual Kit Parts 600px
Product Weight 0.61 lb (with servo)
Servo Included HS-785HB
Travel Up to 19.2"
PWM Range to Achieve Full Travel 850-2150µs

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