Dynamo Sport Gearbox

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The Dynamo Sport is a competition tested high performance line of planetary gearboxes from AndyMark and BaneBots. The Dynamo Sport features numerous improvements over previous planetary gearboxes u...Read More

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Product Overview

The Dynamo Sport is a competition tested high performance line of planetary gearboxes from AndyMark and BaneBots. The Dynamo Sport features numerous improvements over previous planetary gearboxes used on FIRST Robotics Competition robots.

The cold formed steel gears inside this gearbox are a 0.7 Module tooth profile which is 40% larger than the vast majority of planetary gearbox gears previously used on competition robots. The gears are larger, but the housing's size has been optimized to reduce any unnecessary volume. This means you get more reliability without sacrificing precious space. This housing is also one solid piece of aluminium, ensuring that there is no possibility for misalignment of the stages during assembly or during the rigors of match play.

Three stage, versions of these gearboxes also feature an "HD" stage, with gears approximately double the face width of the other stages as well as a strengthened carrier plate. These larger gears on the output stage ensure that it will handle heavy or cantilevered loads without worry. The carrier plates are made of hardened 4140 steel and interface to the output shaft with a robust hex bore. New for 2019 we are opening up the use of every available gear ratio with every available motor input meaning there are some combinations that could theoretically exceed the gearboxes design characteristics. As such the blanket warranty we offered on these gearboxes in the past will be discontinued for future purchases. Rest assured that AndyMark still stands behind our product 100% and if you feel that there is a problem with your gearbox or any of our products please contact us and we will make it right. To help you decide which gearboxes to use for your application please reference the below table which includes the maximum torque that the gearbox is designed to take before it will fail.

A free packet of red tacky grease (am-2768) is included with every gearbox purchased. This grease must be used to coat every internal surface of the gearbox before use.

The Dynamo Sport includes a custom back block along with 2x 6-32 screws and a press fit pinion gear specifically for mounting the Dynamo Motor (am-3740). To install this motor, remove the back cover, support the back of the output shaft, and press on the included pinion gear using an arbor press. This press fit ensures a solid mechanical connection between the pinion gear and the motor. This pinion assembly is not susceptible to vibration, and never needs to be checked once installed. All ratios of the Dynamo Sport Gearboxes use a 4:1 input stage, with the same tooth count pinion, so motors and gearboxes can be switched out with ease.

Part Number Ratio Weight Length Stall Torque* Rated Torque Free Speed*
am-4009_004 4:1 SD 0.98 lb 3.68 in. 0.9 ft-lbs 120 ft-lbs 420 rpm
am-4009_012 12:1 SD 1.19 lb 4.18 in. 2.8 ft-lbs 135 ft-lbs 140 rpm
am-4009_016 16:1 SD 1.20 lb 4.18 in. 3.7 ft-lbs 120 ft-lbs 100 rpm
am-4009_020 20:1 SD 1.20 lb 4.18 in. 4.6 ft-lbs 110 ft-lbs 85 rpm
am-4009_036 36:1 HD 1.49 lb 4.93 in. 8.4 ft-lbs 170 ft-lbs 47 rpm
am-4009_048 48:1 HD 1.52 lb 4.93 in. 11.2 ft-lbs 170 ft-lbs 35 rpm
am-4009_064 64:1 HD 1.50 lb 4.93 in. 15.0 ft-lbs 160 ft-lbs 26 rpm
am-4009_080 80:1 HD 1.52 lb 4.93 in. 18.7 ft-lbs 140 ft-lbs 21 rpm
am-4009_100 100:1 HD 1.52 lb 4.93 in. 23.4 ft-lbs 140 ft-lbs 17 rpm

Common Physical Specifications:

Mounting Features:
  • Four 10-32 0.25 in. deep tapped holes on a 1/2 in. by 1 in. or 1 in. square grid, on two oppisite faces
Output Shaft Geometry:
  • 0.5 in. Hex Profile
  • 1.0 in. Length

*Theoretical maximum values when paired with a Dynamo Motor


  • Product Lifecycle: replaced by <a href="https://www.andymark.com/products/cim-sport-options">CIM Sport Gearbox</a>
  • Ratio: 4:1, 12:1, 16:1, 20:1, 36:1, 48:1, 64:1, 80:1, 100:1


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View our return policy here.


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