# Load Ratings

## MAXPlanetary Cartridge Ratings

### Static Load Ratings

The following torque measurements are for a static load condition. The torque values listed are for the output of the stage.

| Cartridge              | Torque                           |
| ---------------------- | -------------------------------- |
| 2:1 Cartridge          | Fails at 185 N⋅m                 |
| 3:1 Cartridge          | Tested to 290 N⋅m (no failure)   |
| 4:1 Cartridge          | Fails at 270 N⋅m                 |
| 5:1 Cartridge          | Fails at 240 N⋅m                 |
| 9:1 Cartridge          | Fails at 180 N⋅m                 |
| 1/2" Hex Socket Output | Fails at 250 N⋅m                 |
| 1:1 Brake Cartridge    | Tested to 1,200 N⋅m (no failure) |

{% hint style="danger" %}
Shock loads can cause the gearbox to fail in situations where the steady-state torque is still within allowable limits.
{% endhint %}

{% hint style="warning" %}
Cantilevered load on the output shaft puts additional stress on the gearbox and will reduce the torque the gearbox can withstand. 
{% endhint %}

#### 2:1 Cartridge Specifics

The MAXPlanetary 2:1 Cartridge (REV-21-2140) is designed for lower torque applications. Due to its lower failure rating, it should generally be placed closest to the input or motor in a multi-stage MAXPlanetary stack. It is ideal for intakes and faster mechanisms that need a small or specific amount of reduction, while keeping the flexibility to quickly swap cartridges and adjust the total ratio.

### Cartridge Configuration

The following chart shows which gear cartridge configurations are allowable with different motors. Cells shown in **GREEN** are allowed and cells shown in **RED** are not allowed.

{% hint style="info" %}
These ratings are based on the default current limit on SPARK Motor Controllers (or Talon FX). Increasing the current limit increases the maximum torque the motor can produce and may put components of the gearbox outside of their load rating.
{% endhint %}

{% hint style="success" %}
Updated charts with 2:1 Cartridge configurations are coming soon!
{% endhint %}

#### REV Motors

<figure><img src="https://2800450911-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F4vnkeyE3Rv32OmveFas2%2Fuploads%2FzBPeQA1blWiwhK34VRaW%2FMP%20Stage%20Configurations%20REV%20Motors.png?alt=media&#x26;token=cf02a6b7-435b-44b5-a8ea-643c587ed912" alt=""><figcaption><p>Load Rating Chart</p></figcaption></figure>

#### Other Motors

<figure><img src="https://2800450911-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F4vnkeyE3Rv32OmveFas2%2Fuploads%2FnGdC4WgAFu1Ci7Ec9IdI%2FMP%20Stage%20Configurations%20Non-REV%20Motors.png?alt=media&#x26;token=7945f16c-9b2c-4359-89d2-d23d3be4cf7a" alt=""><figcaption></figcaption></figure>

## MAX 90 Degree Gearbox

### Static Load Rating

Gearbox ultimate strength - Failure at 180 NM +/- 5%&#x20;

{% hint style="warning" %}
Please note that this is less than the MAXPlanetary Gearbox can withstand!
{% endhint %}