{"product_id":"pololu-3725-3pi-chassis-kit-no-motors-or-electronics","title":"Pololu 3725 3pi+ Chassis Kit (No Motors or Electronics)","description":"\u003cmeta name=\"description\" content=\"Buy Pololu 3725 3pi+ Chassis Kit (No Motors or Electronics) online in India at best price from The Engineer Store, Bengaluru. Authentic product, 7-day warranty on manufacturing defects, fast delivery across India.\"\u003e\n\n\u003ch1\u003ePololu 3725 3pi+ Chassis Kit (No Motors or Electronics)\u003c\/h1\u003e\n\n\u003cp\u003eThe Pololu 3725 3pi+ Chassis Kit is a precision-engineered mobile robot platform designed for roboticists, educators, and embedded systems developers who need a robust foundation for autonomous navigation projects. This bare chassis kit provides the structural framework and mechanical components without motors or electronics, allowing complete customization of drive systems and control architectures. It solves the critical challenge of integrating reliable mechanical design with flexible electronics integration, enabling rapid prototyping of line-following robots, obstacle avoidance systems, and sensor-based autonomous platforms.\u003c\/p\u003e\n\n\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eThe Pololu 3725 3pi+ Chassis Kit represents the third generation of the acclaimed 3pi mobile robot platform, engineered with improved structural rigidity and enhanced component mounting flexibility. The chassis features a compact cylindrical design measuring 97mm in diameter with a height of 37mm, constructed from durable polycarbonate and aluminum components that provide excellent strength-to-weight ratio. The platform utilizes a differential drive architecture with two independently controllable wheel positions, enabling precise turning radius control and omnidirectional movement capabilities essential for maze-solving and line-following algorithms.\u003c\/p\u003e\n\n\u003cp\u003eThis kit excludes motors and electronics intentionally, providing maximum flexibility for integrating custom motor drivers, microcontroller boards, and sensor suites tailored to specific application requirements. The chassis includes pre-drilled mounting points compatible with standard servo motors, geared motors, and encoder-equipped drive systems. The structural design incorporates a low center of gravity and wide wheelbase for enhanced stability on uneven surfaces, while the modular mounting system allows straightforward integration of infrared sensors, ultrasonic modules, and IMU accelerometers without requiring extensive mechanical modifications.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpecification\u003c\/td\u003e\n\u003ctd\u003eDetails\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eMobile Robot Chassis Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003ePololu Robotics and Electronics\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Number\u003c\/td\u003e\n\u003ctd\u003e3725\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eOriginal\/Authentic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e7 days on manufacturing defects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping\u003c\/td\u003e\n\u003ctd\u003e1-5 days from Bengaluru\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDelivery\u003c\/td\u003e\n\u003ctd\u003e7-8 days across India\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupport\u003c\/td\u003e\n\u003ctd\u003e24\/7 via Email and WhatsApp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChassis Diameter\u003c\/td\u003e\n\u003ctd\u003e97mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChassis Height\u003c\/td\u003e\n\u003ctd\u003e37mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrive Configuration\u003c\/td\u003e\n\u003ctd\u003eDifferential Drive (Two-Motor)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial Construction\u003c\/td\u003e\n\u003ctd\u003ePolycarbonate and Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWheel Mounting\u003c\/td\u003e\n\u003ctd\u003ePre-drilled for standard servo and geared motors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Distribution\u003c\/td\u003e\n\u003ctd\u003eBattery compartment for 4xAA or equivalent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCompact differential drive chassis enabling precise turning and omnidirectional movement control with independent motor control\u003c\/li\u003e\n\u003cli\u003ePre-drilled mounting points compatible with 3mm and 4mm motor shafts, accommodating various gear ratios and torque specifications\u003c\/li\u003e\n\u003cli\u003eIntegrated battery compartment with standard AA battery holder supporting 4.8V to 6V operation for microcontroller and motor driver circuits\u003c\/li\u003e\n\u003cli\u003eModular sensor mounting rails allowing quick integration of infrared reflectance arrays, ultrasonic distance sensors, and gyroscopic stabilization modules\u003c\/li\u003e\n\u003cli\u003eLow-profile design with optimized center of gravity for enhanced stability during high-speed maneuvers and obstacle navigation\u003c\/li\u003e\n\u003cli\u003eDurable polycarbonate shell with reinforced aluminum structural components providing impact resistance and long-term mechanical reliability\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eApplications and Use Cases\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eEducational robotics competitions including IEEE Robotics and line-following challenges where students integrate custom electronics and sensor arrays\u003c\/li\u003e\n\u003cli\u003eAutonomous maze-solving platforms utilizing infrared sensors and encoder feedback for wall-following and dead-reckoning navigation algorithms\u003c\/li\u003e\n\u003cli\u003eResearch prototyping for swarm robotics and multi-agent systems requiring standardized chassis platforms for fleet coordination studies\u003c\/li\u003e\n\u003cli\u003eEmbedded systems development projects combining motor control, real-time sensor processing, and wireless communication modules for IoT robotics applications\u003c\/li\u003e\n\u003cli\u003eSTEM education programs teaching differential drive kinematics, PID motor control, and sensor fusion techniques through hands-on robot construction\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eHow to Use\u003c\/h2\u003e\n\u003cp\u003eBegin by assembling the chassis components according to Pololu's detailed assembly guide, which includes proper wheel installation, battery compartment configuration, and motor mounting bracket alignment. Ensure all fasteners are tightened to specification to prevent mechanical slippage during operation. Select appropriate motors based on your application requirements, considering torque specifications for your robot's total mass and desired speed profile, then secure motors to the pre-drilled mounting points using the provided hardware.\u003c\/p\u003e\n\n\u003cp\u003eIntegrate your chosen microcontroller board and motor driver module into the available mounting space, ensuring proper power distribution between the battery compartment, motor driver inputs, and logic circuits. Install your sensor suite on the designated mounting rails, calibrating infrared sensors and ultrasonic modules according to your specific navigation algorithm requirements. Test mechanical functionality by manually rotating wheels and verifying smooth differential drive operation before uploading control firmware. Connect your programming interface and implement motor control routines, starting with basic speed control before advancing to closed-loop encoder feedback and autonomous navigation algorithms.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat motors are compatible with the Pololu 3725 3pi+ Chassis Kit?\u003c\/summary\u003e\n\u003cp\u003eThe chassis supports standard 3mm and 4mm shaft diameter motors with gear ratios typically ranging from 50:1 to 298:1. Pololu offers pre-tested motor options including their micro metal gearmotors and extended-shaft variants. Motor selection depends on your desired speed and torque profile, with higher gear ratios providing increased torque at reduced speed for obstacle navigation, while lower ratios enable faster movement for open-field applications. We recommend consulting Pololu's motor compatibility guide for your specific application requirements.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this chassis for line-following robot competitions?\u003c\/summary\u003e\n\u003cp\u003eYes, the 3725 chassis is specifically designed for line-following applications. Its compact size, low center of gravity, and modular sensor mounting make it ideal for integrating infrared reflectance sensor arrays. The differential drive architecture provides the turning precision required for sharp corner detection and correction. You will need to add appropriate infrared sensors, a microcontroller with PWM motor control capability, and implement PID algorithms for optimal line-following performance.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the maximum payload capacity of this chassis?\u003c\/summary\u003e\n\u003cp\u003eThe Pololu 3725 chassis can support approximately 500-750 grams of additional payload depending on motor selection and desired performance characteristics. This includes electronics, sensors, batteries, and structural additions. For heavier payloads, consider selecting higher torque motors with appropriate gear ratios to maintain acceptable acceleration and speed performance while preventing motor stalling.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes the kit include wheels and axles?\u003c\/summary\u003e\n\u003cp\u003eThe chassis kit includes wheel hubs and mounting hardware, but wheels are typically sold separately to allow customization based on your application's terrain and traction requirements. Pololu offers various wheel options including rubber tires for improved grip and plastic wheels for smooth surface operation. Axles are included in the kit with appropriate bearing support for smooth rotation.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhen will I receive my order?\u003c\/summary\u003e\n\u003cp\u003eOrders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is your return and warranty policy?\u003c\/summary\u003e\n\u003cp\u003eWe offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre bulk discounts available?\u003c\/summary\u003e\n\u003cp\u003eYes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eWhy Buy from The Engineer Store\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Products: Sourced directly from authorized distributors with authentication\u003c\/li\u003e\n\u003cli\u003eExpert Team: Our technical team validates every product before listing\u003c\/li\u003e\n\u003cli\u003eFast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse\u003c\/li\u003e\n\u003cli\u003ePan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata\u003c\/li\u003e\n\u003cli\u003ePayment Options: COD, UPI, credit\/debit cards, net banking, EMI available\u003c\/li\u003e\n\u003cli\u003eTechnical Support: 24\/7 expert guidance via email and WhatsApp\u003c\/li\u003e\n\u003cli\u003eReturns: 7-day return policy on manufacturing defects only\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eBuy Pololu 3725 3pi+ Chassis Kit (No Motors or Electronics) Online in India\u003c\/h2\u003e\n\u003cp\u003ePurchase the \u003cstrong\u003ePololu 3725 3pi+ Chassis Kit (No Motors or Electronics)\u003c\/strong\u003e online at \u003ca href=\"https:\/\/theengineerstore.in\"\u003eThe Engineer Store\u003c\/a\u003e, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on \u003cstrong\u003ePololu 3725 3pi+ Chassis Kit (No Motors or Electronics)\u003c\/strong\u003e with fast shipping and expert support.\u003c\/p\u003e\n\u003cp\u003eOur team in Bengaluru is available 24\/7 to support your journey from product selection to project completion.\u003c\/p\u003e","brand":"My Store","offers":[{"title":"Default Title","offer_id":43853758791843,"sku":"TES-EV02528","price":2378.64,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/4479\/7091\/products\/3725-228x228.jpg?v=1704191635","url":"https:\/\/www.theengineerstore.in\/te\/products\/pololu-3725-3pi-chassis-kit-no-motors-or-electronics","provider":"The Engineer Store","version":"1.0","type":"link"}