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785 Gear Rack Kit (Single Parallel)

  • Perfect for steering racks and other applications that require linear motion
  • A simple and smooth linear slide system
  • The beam gear rack has 118 teeth
  • Included parts (see full list below)
  • This kit incorporates our patented direct mount servo gears
  • Mount in a horizontal or vertical orientation
  • Up to 9.6” of travel
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The 785 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 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 Gear Rack Kit is great for steering racks and other applications that require linear motion 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”. 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 Y (set) #585715
(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
(2) 6-32 x 5/8” Socket Head Cap Screws
(2) 6-32 Nylock Nuts
(6) #6 washers
(1) 16T, 32P Metal Servo Gear #615278
(1) 32P Beam Gear Rack #615410
(1) 12.32” Aluminum Beam #585423
637169 785 Gear Rack Single Sideways Kit Parts 600px
Product Weight 0.46 lb (with servo)
Servo Included HS-785HB
Travel 9.6"
PWM Range to Achieve Full Travel 850-2150µs

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