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Plastic Gears (5 Types)Plastic Gears (5 Types) Build smoother mechanical movements, experiment with gear ratios, and create compact mechanisms with this set of plastic gears. Designed for DIY projects, robotics models, educational experiments, toy repairs, and small mechanical assemblies, the set gives makers multiple gear options for...
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75 pcs-lot different type mini gear Plastic Gear Set75 pcs-lot different type mini gear Plastic Gear Set Gears are incredibly useful - they can be used to create custom gearboxes to transfer motion, change output shaft speed, increake torque, and any number of other gear like functions. Different types of gears have...
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Rs 240/-
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Plastic Motor Gears, Belts & Pulleys
Plastic Motor Gears, Belts & Pulleys
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Gear Ratio & Torque – Quick Guide
- Gear ratio tells how many turns the motor makes for one turn of the output gear.
- Formula: Gear Ratio = Driven Gear Teeth ÷ Driving Gear Teeth.
- Example: 10T → 40T = 4:1, meaning the motor spins 4 times for 1 wheel rotation.
- Higher gear ratio (4:1, 5:1) = slower speed but higher torque → good for climbing, lifting, heavy robots.
- Lower gear ratio (1:1, 2:1) = faster speed but lower torque → good for fast robots and RC cars.
- Torque relationship: Output Torque ≈ Input Torque × Gear Ratio (minus small losses).
- Example: 0.5 kg·cm motor torque × 4:1 → ~2 kg·cm output torque.
- Choose gear ratio based on whether your project needs speed or power.
Step-by-Step: Motor Assembly with Gears
- Select the Motor & Gear Type
- Choose a DC/gear motor suitable for the load.
- Pick matching gears (spur, bevel, or pinion + gear) with the right bore size.
- Fit the Pinion Gear on the Motor Shaft
- Slide the small gear (pinion) onto the motor shaft.
- Use a set screw or press-fit to secure it firmly.
- Ensure it sits straight and does not wobble.
- Mount the Driven Gear on the Output Shaft/Wheel
- Fix the larger gear on the axle, wheel shaft, or intermediate shaft.
- Use a hub, coupler, or set screw to lock it in place.
- Align the Gears
- Position motor and shaft so that the teeth fully engage but are not too tight.
- There should be a tiny amount of play to avoid friction and noise.
- Secure Motor & Shafts to the Chassis
- Use mounting brackets, screws, or 3D-printed holders.
- Ensure the gears maintain alignment even under load.
- Test the Assembly
- Slowly power the motor.
- Check for smooth rotation, no slipping, and no unusual noise.
- Adjust spacing or alignment if there is binding or skipping.
Comparison of Gear Sizes & Materials
Gear Size (Teeth & Diameter)
| Feature | Small Gears (Few Teeth) | Large Gears (More Teeth) |
|---|---|---|
| Speed Effect | Higher speed, lower torque | Lower speed, higher torque |
| Use Case | High-speed stages, intermediate stages | Final drive stages, high-torque applications |
| Placement | Close to motor | On wheels, arms, heavy load points |
Gear Materials
| Material | Characteristics | Typical Use Cases |
|---|---|---|
| Plastic (Nylon/ABS) | Lightweight, low noise, low cost, less durable | Educational kits, small robots, light loads |
| Brass | Good strength, smooth operation, moderate wear | Hobby gearboxes, servo mods, medium loads |
| Steel | Very strong, durable, higher noise, heavier | High-torque robots, heavy-duty mechanisms |
| Aluminium | Lightweight, stronger than plastic, less wear than plastic | Drones, light robotics, custom CNC parts |
Applications in Robotics & Mechanical Projects
Line-following & obstacle-avoiding robots : Use gearboxes and spur gears to slow down the motor and increase torque for controlled movement.
Robotic arms & grippers : Gears and pulleys help increase torque at the joints, allowing the arm to lift small objects smoothly.
RC cars & battle bots : Adjust gear ratio to balance speed and push force (torque) based on track and load.
Conveyor belts & DIY mechanisms : Pulleys and belts transfer motion from the motor to different shafts quietly and with less vibration.
CNC / 3D printer mechanisms : Timing belts and pulleys help in precise linear motion for X/Y axes.
1. Are these gears compatible with DC motors?
Yes, the gears in this collection are compatible with DC motors, provided you match the shaft size, bore diameter, and gear ratio properly. Many of the gears are designed to attach onto motor shafts (both DC and stepper) or can be mounted via couplers or set screws. For best results, ensure the bore of the gear/pulley fits the motor shaft snugly, check that the gear’s material and teeth profile suit the torque your motor delivers, and secure it in such a way that it won’t slip under load. When all these align, you can pair a DC motor with these gears for smooth power transmission.
2. Can I use these belts and pulleys for robotics projects?
Absolutely. The belts and pulleys in this collection were built for motion control, so robotics applications such as chassis drive systems, arm mechanisms, linear actuation or timing loops are all valid use-cases. For instance, timing belts with matching pulleys allow you to convert motor rotation into precise linear motion or synchronous movements—ideal when your robot needs reliable, repeatable motion. To get the best outcome, pick the correct belt width, tooth profile and pulley bore for your robot’s motors and structural layout, ensure tension is appropriate (not too slack, not overly tight), and secure mounting so nothing shifts under movement.
3. Are these available in bulk or individual pieces?
Yes, these items are available both individually and in bulk quantities. You can purchase single gears, one belt segment, one pulley wheel, etc., for hobby-scale builds or prototypes. If you’re outfitting a robotics lab, classroom, or doing multiple builds where you’ll need many units, bulk orders are also supported—sometimes with better pricing and options. Just check the listing to see whether the product is offered as “1 piece” or has “bulk quantity” pricing/discounts. That flexibility makes the collection suitable for one-off projects or for scaling up across many robots or assemblies.
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