47a8b40fdb
TREE(74): training modules, entity profiles, 2890 references, keyword indices SPROUT(42): knowledge pages, project docs, curated source material SEED(164): daily notes, raw session logs, unprocessed material Updated AUDIT_MANIFEST.json with growth classifications.
84 lines
3.5 KiB
Markdown
84 lines
3.5 KiB
Markdown
---
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title: "MAXPlanetary Gearbox System — REV-21-2100"
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tags:
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- hardware
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- gearbox
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- planetary
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- REV
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- 2890
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- ion
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type: hardware-spec
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owner: 2890
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status: active
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sources:
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- "https://www.revrobotics.com/maxplanetary-system-kit/"
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- "https://docs.revrobotics.com/ion-build/motion/maxplanetary-system"
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growth: tree
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---
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# MAXPlanetary Gearbox System — REV-21-2100
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## Overview
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Team 2890 uses the **MAXPlanetary** as their standard cartridge-based modular planetary gearbox. It's designed specifically for NEO-class motors (NEO, NEO 550, Falcon 500, 775) and allows rapid gear ratio changes without redesigning the entire mechanism.
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## Key Features
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- **Cartridge-based design** — swap gear ratios on the fly without rebuilding
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- **27 gear ratios available** — 2:1 to 125:1 by stacking cartridges
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- **Self-contained lubricated cartridges** — no re-greasing on swap
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- **Three mounting options** — face mount, side mount, or stacked
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- **1/2in hex output shaft** — compatible with standard FRC hex bearings
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- **MAXSpline output** — integrates with REV ION system
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- **Assembly front-to-back** — change ratios while mounted on robot
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## Available Cartridges
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| Cartridge | Ratio | Notes |
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|-----------|-------|-------|
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| 2:1 | 2:1 | **Reverses direction** — invert motor in code |
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| 3:1 | 3:1 | |
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| 4:1 | 4:1 | |
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| 5:1 | 5:1 | |
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| 9:1 | 9:1 | |
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| 1:1 Brake | 1:1 | Sprag clutch — holds position, prevents backdriving |
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**Combo math:** Stack cartridges for compound ratios. Example: 5:1 × 4:1 × 3:1 = 60:1 total reduction.
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## Brake Cartridge
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The **1:1 Brake Cartridge** uses a sprag clutch (torque diode) to mechanically lock output when motor is stationary. Automatically engages when output exceeds motor velocity.
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**Specs:**
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- Working torque: 16.95 Nm (150 in-lb)
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- Static torque (no failure): 1,200 Nm (10,621 in-lb)
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- Recommended as first cartridge (closest to motor) for maximum brake life
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## 90 Degree Gearbox
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The **MAX 90 Degree Gearbox** provides right-angle power transmission. Attaches to MAXPlanetary in 90° orientation for compact mechanisms in tight spaces. Through-bore design allows easy mounting.
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## Connection to Training
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**For students:** The MAXPlanetary teaches gear reduction fundamentals:
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- **Why reduction?** — trade speed for torque. Motor has high RPM, low torque. Gearbox slows it down but multiplies force.
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- ** planetary stages** — each cartridge adds one stage of reduction. More stages = more torque, less speed.
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- **Ratio math** — multiply cartridge ratios to get total. 3:1 × 5:1 = 15:1.
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- **Brake cartridge** — mechanical holding, not motor braking. Independent of motor state.
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**Related training modules:**
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- [[motor-basics]] — understanding motor output before gearbox
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- [[swerving-modules]] — MK4i doesn't use MAXPlanetary (direct drive), but mechanisms do
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- [[ion-build-system]] — integrates with REV ION structure
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- [[2890-codebase-index]] — mechanism controllers that use gearbox output
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## Source Links
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- Product: https://www.revrobotics.com/maxplanetary-system-kit/
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- Docs: https://docs.revrobotics.com/ion-build/motion/maxplanetary-system
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## Notes
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Chris typically uses MAXPlanetary on mechanisms (intake, shooter, climber) rather than drivetrain. Swerve modules have built-in belt reduction in the MK4i. For any mechanism that needs high torque at low speed — that's where MAXPlanetary lives.
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Key concept for students: **gear reduction multiplies torque while dividing speed**. A 5:1 gearbox means the output turns 5× slower but the motor can push 5× harder. |