System Features

The REV Robotics MAXPlanetary System includes the following features:

• Three different, self-contained gear ratio cartridges providing twenty-seven gear ratios ranging from 3:1 to 125:1

• High torque density

• Easy assembly without modifying the motor

• A Socket 1/2in Hex Output with the ability to retain a shaft blind

• Assembled front to back for ease of changing the gear ratio while the MAXPlanetary Gearbox is mounted on the robot

Cartridge Features

A breakdown of the MAXPlanetary Cartridges

Input Spline - Accepts torque from the previous stage while being easy to insert and remove.

Output Spline - Provides torque transfer between one stage and the next while being easy to insert and remove.

Assembly Holes - The screws holding the gearbox together pass through these holes.

Shields - Keeps the internal components of the gear stage in their place when the stage isn’t assembled into a gearbox. Also retains grease to keep the gear stage lubricated throughout its service life.

Alignment Tabs - Alignment features that engage with the alignment notches on the previous stage. The directional nature of the alignment features prevents the user from assembling any gearbox components backwards.

Alignment Notches - Provides a socket for the alignment tabs to engage with. These features keep the rotating components concentric as well as providing angular alignment to keep the flat faces of the gearbox in plane.

Input Features

Side Mounting Holes - These 10-32 holes allow the gearbox to be mounted on top of structural components without obstructing the front of the gearbox.

Assembly Holes - The screws holding the gearbox together pass through these holes.

Alignment Notches - Provides a socket for the alignment tabs on the first gear stage to engage with. These features keep the rotating components concentric as well as providing angular alignment to keep the flat faces of the gearbox in plane.

NEO Mounting Holes - These holes are for mounting NEO-class motors to the input block.

550 Mounting Holes - These holes are for mounting the NEO 550 to the gearbox.

775 Mounting Holes - These holes are for mounting 775-series motors to the gearbox

775 Vent Holes - These holes line up with the vent holes on the face of 775-series motors and allow cooling air to pass through the motor.

MAXPlanetary Universal Input Stage V2 Additional Features

The MAXPlanetary Universal Input Stage V2 (REV-21-2146) is a redesigned mounting solution for integrating a wide range of FRC motors into the MAXPlanetary System. Built as the next evolution of the original universal input stage, V2 enhances strength, expands motor compatibility, and enables even more compact gearbox configurations.

• Updated universal input stage for MAXPlanetary System integrations

• New 1.375 inch bolt circle supports additional motor mounting (e.g. Kraken X44)

• CIM class motor pattern clocked 45 degrees for improved fitment and packaging

• Allows NEO 2.0 Brushless Motor flats to align flush for extremely compact assemblies

• Reinforced mounting tabs increased from 0.125 inch to 0.25 inch thickness

• Direct motor compatibility with no additional input kits required for:

  • NEO 2.0, NEO 1.1, NEO 1.0

  • Kraken X60, Kraken X44

  • Pulsar 775

  • CIM

• Compatible with additional motors when used with corresponding input kits:

  • NEO 550 (REV-21-2117)

  • Minion (REV-21-2139)

  • 775 and 775pro (REV-21-2118)

Output Features

Socket 1/2in Hex Output - Engages with a 1/2in hex shaft to drive a robot mechanism. The output includes a #10 clearance hole through the middle, which allows a shaft to be retained in the output.

Face Mounting Holes - These 10-32 holes allow the gearbox to be mounted to the face of a bracket or tube in several useful orientations.

Side Mounting Holes - These 10-32 holes allow the gearbox to be mounted on top of structural components without obstructing the front of the gearbox.

Threaded Assembly Holes - The screws holding the gearbox together thread into these holes to clamp the gearbox stack together.

Input Spline - Accepts torque from the last gear stage while being easy to insert and remove.

Alignment Tabs - Alignment features that engage with the alignment notches on the last stage. The directional nature of the alignment features prevents the user from assembling any gearbox components backwards.

MAXPlanetary MAXSpline Output Coupler

The MAXPlanetary MAXSpline Output Coupler (REV-21-3630) provides a compact and reliable way to interface a MAXPlanetary Gearbox’s 1/2 inch hex output with MAXSpline Shaft systems.

One side of the coupler accepts up to 0.47 inch of 1/2 inch hex shaft and uses a #10-32 screw that threads into the shaft end to lock it in place. The opposite side is machined for MAXSpline Shaft and provides 0.5 inch of engagement, secured using a removable two piece clamping collar tightened by two M3 socket head screws. The collar can be opened or removed without fully disassembling the system, making assembly and maintenance easier while ensuring strong, consistent shaft retention

Parameter	Value and Units
Outside Diameter	25mm (0.98in)
Length/Width	19.1mm (0.75in)
Input Bore	1/2in Hex
Output Bore	MAXSpline Bore
Shaft Collar Locking Screw Size	M3 x 16mm Socket Cap (2.5mm Hex Key)
Material	6061 Aluminum
Weight	58g (0.128lb)

Additional Input Coupler Options

8mm Keyed Input Coupler Kit (REV-21-2108) - Compatible with NEO Vortex, NEO V1.1, NEO 550 and CIM motors.

1/2in Hex Input Coupler (REV-21-2110) - Compatible with 2 Motor Gearbox - Through Bore and the MAX 180 Degree Gearbox, all designed to drive the MAXPlanetary

14T Spline Input Coupler (REV-21-2124) - Compatible with Falcon 500 and other 14T spline motors.

15T Spline Input Coupler (REV-21-2138) - Compatible with the SplineXS (Kraken and Minion) shaft spline, and other motors that have a 15T output.