| Component Category | Budget Build | Performance Build |
|---|---|---|
| Total Cost | $130-150 | $170-190 |
| ESC | Repeat Robotics Dual ($19.99) | Weka 20A v2.2 ($40+) |
| Motors | Repeat Motors Mk 4mm ($20) | Repeat Motors Mk 4mm ($20) |
| Other Components | Same | Same |
- Part: Repeat Robotics Budget Brushed Dual ESC (2-4S)
- Price: $19.99
- Supplier: itgresa.com
- Features: Dual channel brushed ESC, 2-4S LiPo compatible
- Weight: TBD
- Quantity: 1
- Part: Weka 20A v2.2 Dual ESC
- Price: $40+
- Supplier: justcuzrobotics.com, also available through itgresa.com
- Features: 20A per channel, 3g weight without wires, overcurrent/undervoltage protection, mixing enabled
- Weight: 3g (without wires)
- Quantity: 1
- Part: Repeat Motors Mk 4mm
- Price: $20 for 2 motors
- Supplier: itgresa.com
- Specifications: Brushed gear motors, 4mm shaft with grub screw attachment, 3S LiPo compatible
- Quantity: 2
- Part: OVONIC 3S LiPo 450mAh
- Specifications: 11.1V, 80C discharge rate, XT30 connector, 35g weight
- Price: $20-25 for 4-pack (recommended for competition rotation)
- Supplier: Amazon
- Quantity: 4-pack recommended (minimum 2)
- Part: ISDT PD60 Balance Charger
- Price: $19.99
- Specifications: 60W, 6A max, 1-4S LiPo capable, USB-C input (5-20V)
- Features: Balance charging, upgradeable firmware, silent cooling
- Supplier: Amazon
- Quantity: 1
- Part: Lynx Anti-Spark Kill Switch
- Price: Varies by vendor
- Specifications: High-current anti-spark design for combat robotics
- Supplier: itgresa.com, justcuzrobotics.com, various combat robotics vendors
- Quantity: 1
- Part: Xiao ESP32C3
- Price: $10
- Features: WiFi capability, compact form factor, Arduino IDE compatible
- Quantity: 1
- Part: Xiao ESP32S3
- Price: $17
- Features: Enhanced features over ESP32C3, WiFi capability
- Quantity: 1
- Part: Xbox Standard Controller
- Price: $60
- Features: Wireless connection to microcontroller, familiar ergonomics, reliable operation
- Supplier: Amazon, electronics retailers
- Quantity: 1
- Part: XT30 Connectors (Male and Female)
- Specifications: High-current battery connections, male for battery side, female for robot side
- Supplier: Amazon, electronics suppliers
- Quantity: 2-4 pairs (spares recommended)
- Power Wires: 16-18 AWG for main power and motor connections
- Signal Wires: 22-24 AWG for control signals
- Heat Shrink Tubing: Various sizes (2mm, 4mm, 6mm)
- Solder: 60/40 rosin core, 0.6-0.8mm diameter
- Supplier: Amazon, electronics suppliers
-
Part: M3 × 12mm Torx Flat Head Thread-Forming Screws
-
Drive Size: T8
-
Application: Chassis mounting, plastic component attachment
-
Features: 90° countersink, thread-forming for plastic
-
Supplier: McMaster-Carr
-
Quantity: TBD
-
Part: M2 × 0.4mm × 6mm Torx Flat Head Screws
-
Drive Size: T6
-
Material: Zinc-plated steel
-
Application: Motor mounting, electronics mounting
-
Supplier: McMaster-Carr
-
Quantity: TBD
-
Part: M4 × 0.7mm × 8mm Grub Screws (cup point)
-
Application: Wheel attachment and securing points
-
Supplier: McMaster-Carr
-
Quantity: 8
-
Part: M2 × 0.40mm × 5mm Flat Head Threading Screws
-
Application: Various chassis connections
-
Supplier: McMaster-Carr
-
Quantity: TBD
-
Part: M4 × 0.70mm × 20mm Button Head Screws
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Application: Motor mounting, structural connections
-
Supplier: McMaster-Carr
-
Quantity: 4
-
Part: 5/16" × 7/8" or 1" Shoulder Screws (1/4"-20 thread)
-
Application: Pivot points, structural connections
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Supplier: McMaster-Carr
-
Quantity: 2
-
Part: 1/4"-20 Nylon-Insert Lock Nuts
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Application: Securing shoulder screws
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Supplier: McMaster-Carr
-
Quantity: 2
- Part: Loctite Medium Strength (Blue) Thread Locker
- Application: All critical threaded connections
- Note: Apply only during final assembly
- Supplier: Hardware stores, Amazon
- Quantity: 1 small bottle
- Part: 3M Dual Lock Tape
- Application: Securing components without permanent attachment
- Features: Strong, removable mounting system
- Supplier: Amazon, industrial suppliers
- Quantity: 1 roll
- Material: Lightweight aluminum or titanium frame
- Source: Custom fabrication or 3D printing from provided CAD files
- Files: Available in
cad/directory - Weight: Optimized for 1lb weight budget
- Part: Foam wheels with hex cores
- Files: CAD files available for 3D printing cores
- Application: Drive and support wheels
- Quantity: 4 (typically)
- T6 Torx L-Key: 1-1/4" overall length (for M2 screws)
- T8 Torx L-Key: 1-3/4" overall length (for M3 screws)
- Quality: Professional grade recommended (Wera, Wiha, Bondhus)
- Supplier: McMaster-Carr, Amazon, tool suppliers
- Sizes: 5/32" (4mm), 2.5mm, 2mm, 1.5mm
- Additional: Appropriate size for M2×5 screws
- Quality: Good quality L-keys or ball-end sets
- Supplier: Hardware stores, Amazon
- 7/16" Wrench: For lock nuts
- Needle or Micro Flathead Screwdriver: Fine adjustment work
- Wire Strippers: For 16-24 AWG wire
- Precision Scale: 0.1g accuracy for weight verification
- Soldering Iron: 25-40W with fine tip, temperature controlled preferred
- Solder: 60/40 rosin core, 0.6-0.8mm diameter
- Flux: Additional rosin flux for clean joints
- Heat Gun or Hair Dryer: For heat shrink tubing
- Multimeter: For continuity testing and voltage measurement
- Test Blocks: Elevate robot for safe wheel testing during assembly
- LiPo Battery Tester: Verify cell voltages
- Work Light: Good lighting for precise work (minimum 500 lux)
- Safety Glasses: Required during soldering and assembly
- Sand Bucket: For smothering LiPo fires during motor/robot testing
- Fire Extinguisher: Electrical fire rated for general electrical safety
- LiPo Charging Bag: Fire-safe charging container
- Well-Ventilated Area: Or fume extractor for soldering
- itgresa.com: Repeat Robotics ESC ($19.99), Repeat Motors ($20), Lynx Kill Switch, Weka ESCs
- justcuzrobotics.com: Weka 20A v2.2 ESC ($40+), advanced combat electronics
- Amazon: OVONIC batteries ($20-25), ISDT charger ($19.99), Xbox controllers ($60), XT30 connectors
- McMaster-Carr: All fasteners, precision hardware, thread locker, professional tools
- Combat Robotics Parts: May have longer lead times, order early
- Standard Electronics: Usually 1-3 days from Amazon
- Precision Fasteners: McMaster-Carr typically next-day delivery
- Budget Build: $130-150 | Performance Build: $170-190 | Tools: $50-100 (one-time)
| Component Category | Typical Weight | Notes |
|---|---|---|
| Electronics | 120-150g | ESC, motors, battery, microcontroller |
| Chassis | 150-200g | Aluminum/titanium frame |
| Fasteners | 20-30g | All screws, bolts, hardware |
| Wheels | 40-60g | Foam wheels with cores |
| Miscellaneous | 30-50g | Wiring, mounting materials |
| Total Target | ~450g | 4g margin for 454g limit |
- Minimize wire length - every inch adds weight
- Use appropriate fastener sizes - don't oversize
- Choose lightweight chassis materials
- Remove excess material where structurally safe
- XT30 Polarity: Male connector on battery (larger terminal = positive)
- Thread Pitch: M2 × 0.4mm fine pitch for precision mounting
- Battery Capacity: 450mAh optimized for 1lb weight budget
- ESC Current Rating: Must handle motor stall current safely
- Torx Tools: Quality bits prevent stripping
- Battery Safety: Use balance charger, never leave charging unattended. Keep sand bucket nearby during testing - LiPo fires must be smothered, not extinguished with water
- Fastener Quality: Use proper grade fasteners from reputable suppliers
- Competition Spares: Carry extra XT30 connectors and fasteners
| Version | Date | Changes |
|---|---|---|
| 1.0 | 2025-07-08 | Initial consolidated parts list creation |
| Added specific Torx fastener specifications | ||
| Consolidated information from ASSEMBLY.md and AGENDA.md | ||
| Added detailed supplier information and pricing |
Note: This parts list consolidates information previously scattered across multiple documents. All builders should verify current pricing and availability before ordering, as costs and suppliers may change.