# MAXPlanetary System

{% hint style="success" %}
Looking for the UltraPlanetary Gearbox System ([REV-41-1600](https://www.revrobotics.com/rev-41-1600/))? Check out the [UltraPlanetary Gearbox System Overview](https://docs.revrobotics.com/rev-crossover-products/ultraplanetary/up-gearbox) in our Crossover Documentation.
{% endhint %}

## MAXPlanetary System Overview

The MAXPlanetary System ([REV-21-2100](https://www.revrobotics.com/rev-21-2100/)) is a cartridge-based modular planetary gearbox designed from the ground up for NEO-class motors. The design of the MAXPlanetary has been carefully optimized to provide torque density unavailable in FRC up until now.

The MAXPlanetary is intended for use with the NEO, NEO 550, Falcon 500, and 775 motors. Building on the ability to iterate and adjust designs easily, the MAXPlanetary System consists of lubricated cartridges, allowing for swapping gear ratios on the fly and with ease. Users can configure a single-stage planetary using one of five different reduction cartridges or build multi-stage gearboxes by stacking individual cartridges together. The user can use the included 1/2in hex shaft or use a custom length of hex shaft best suited for the application. The gearbox also provides two mounting options, face mount and side mount, for ultimate flexibility in your robot design.

<figure><img src="https://2800450911-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F4vnkeyE3Rv32OmveFas2%2Fuploads%2FVxPJM4SZTCbLoOCyUKBf%2Fimage.png?alt=media&#x26;token=82cf482c-088e-40ed-a60b-ca45b38c51d2" alt="An image of a black NEO motor with the MAXPlanetary gearbox attached. The 3 loaded cartridges are the 5:1, 4:1, and 3:1 ratios in that order."><figcaption><p>MAXPlanetary Gearbox with 3 cartridges</p></figcaption></figure>

### MAXPlanetary Gearbox Features

The REV Robotics MAXPlanetary Gearbox includes the following features:

* Three different, self-contained gear ratio cartridges providing twenty-seven gear ratios ranging from 2:1 to 125:1&#x20;
* 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

#### MAXPlanetary Gearbox Cartridge Options

* 2:1 Cartridge ([REV-21-2140](https://www.revrobotics.com/rev-21-2140/))
* 3:1 Cartridge ([REV-21-2101](https://www.revrobotics.com/rev-21-2101/))
* 4:1 Cartridge ([REV-21-2102](https://www.revrobotics.com/rev-21-2102/))
* 5:1 Cartridge ([REV-21-2103](https://www.revrobotics.com/rev-21-2103/))
* 9:1 Cartridge ([REV-21-2129](https://www.revrobotics.com/rev-21-2129/))

{% hint style="warning" %}
The MAXPlanetary 2:1 Cartridge will **reverse** the direction of your gearbox output. If you are swapping an existing cartridge for a 2:1, ensure that your motor has been inverted in code before running the robot.
{% endhint %}

## MAXPlanetary 1:1 Brake Cartridge

<figure><img src="https://2800450911-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F4vnkeyE3Rv32OmveFas2%2Fuploads%2FzZmHtVoiGj0zmdnMG4Sh%2F1_1Brake_HERO_Final.png?alt=media&#x26;token=04dbed59-582c-49f3-a9a6-10cefc90e462" alt="" width="375"><figcaption></figcaption></figure>

The MAXPlanetary 1:1 Brake Cartridge enables your MAXPlanetary System to mechanically hold its position. A steel internal ring housed in a lightweight aluminum case provides excellent strength and durability while maintaining a compact standard cartridge size. The cartridge integrates seamlessly with all other MAXPlanetary stages and occupies only a single slot. Designed around the principles of a sprag clutch, sometimes referred to as a torque diode, clutch, or overrunning clutch, this cartridge prevents backdriving in either direction by locking the output whenever the motor or input is stationary. The brake engages automatically when the output velocity exceeds the motor velocity, and it can be reliably released because the unlocking torque is approximately eighty percent of the locking load.

The Brake Cartridge can be added anywhere within the gear stack assembly, however it is recommended to use the Brake Cartridge as the first cartridge, closest to the motor, before any gear reduction to maximize its life.

{% hint style="success" %}
See our [MAXPlanetary 1:1 Brake Cartridge Tips](https://docs.revrobotics.com/ion-build/motion/assembly-tips-and-tricks#maxplanetary-brake-cartridge-tips) section for more information about assembly
{% endhint %}

#### Specifications - MAXPlanetary 1:1 Brake Cartridge&#x20;

| Parameter                                                 | Value and Units             |
| --------------------------------------------------------- | --------------------------- |
| Height                                                    | 50.8mm (2in)                |
| Width                                                     | 13.72mm (0.54in)            |
| Length                                                    | 61.91mm (2.44in)            |
| Weight                                                    | 154g (0.340lb)              |
| Face Mounting Pattern                                     | #10-32 on a 2in Bolt Circle |
| 1:1 Brake Cartridge Static Torque (No Failure) at Output  | 1,200Nm (10,621 in-lb)      |
| 1:1 Brake Cartridge Working Torque (No Failure) at Output | 16.95Nm (150 in-lb)         |

## MAX 90 Degree Gearbox

{% hint style="info" %}
Looking for the Ultra 90 Degree Gearbox ([REV-41-2080](https://www.revrobotics.com/rev-41-2080/))? Check out the [Ultra 90 Degree Gearbox Overview](https://docs.revrobotics.com/rev-crossover-products/ultraplanetary/ultra-90) in our Crossover Documentation.
{% endhint %}

Designed with an efficient right-angle configuration, the MAX 90 Degree Gearbox offers a robust and high-performance solution to building a more compact robot. Connect the MAX 90 Degree Gearbox to the MAXPlanetary System in a 90-degree orientation for maximum flexibility and ease of use in tight spaces. The through bore design of the gearbox allows for easy mounting and integration into a wide range of applications. Its 90-degree output orientation provides a compact and efficient way to transmit power and torque at right-angle configurations.

<figure><img src="https://2800450911-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F4vnkeyE3Rv32OmveFas2%2Fuploads%2FxvBAWc997vcsddMcXDCu%2FREV-21-2120-0.5inHexThroughBore90DegGearbox-Iso-FINAL.png?alt=media&#x26;token=c1983ad7-edd9-4e0d-955c-e9eb26a29e77" alt=""><figcaption><p>MAX 90 Degree Gearbox</p></figcaption></figure>

{% hint style="success" %}
When assembling the MAX 90 Degree Gearbox we recommend adding grease during assembly and re-applying as needed for the maintenance of your mechanism. For most applications, using [White Lithium Grease](https://www.amazon.com/dp/B06XY6QKS7?ref_=cm_sw_r_cp_ud_dp_P3B2T1TKR60YKSY7R4XA\&peakEvent=4\&dealEvent=1) or [Red Tacky Grease](https://www.amazon.com/Lucas-Oil-10574-Tacky-GREASE/dp/B0049SUK5Y?th=1) will provide sufficient lubrication.
{% endhint %}