Mechanical · Automobile engineering · Final year project
Six Legged Spider Bot using Klann Mechanism
A six-legged walking robot built on the Klann linkage. A crank, rockers and couplers convert rotation into stepping motion, so the robot walks without a microcontroller or complex actuators.
What is the Six Legged Spider Bot using Klann Mechanism project?
A six-legged walking robot built on the Klann linkage. A crank, rockers and couplers convert rotation into stepping motion, so the robot walks without a microcontroller or complex actuators.
Key facts
- Branch
- Mechanical & Automobile Engineering; also suits Mechatronics
- Type
- Final year project · Advanced
- Suitable for
- Diploma capstone and B.E / B.Tech final year
- Build time
- 6 to 8 weeks
- Estimated component cost
- ₹11,300 – ₹16,600
- Guidance from
- ₹9,999 (Hardware / IoT Final Year)
How the Six Legged Spider Bot using Klann Mechanism works
- The mild steel frame and fabrication forms the base that carries every other part, so it is designed first from the load and size of the machine.
- The DC geared motor provides the driving motion.
- The Motor driver lets the low-current controller run the motors forward, reverse and at variable speed.
- Motion is transmitted through DC geared motor, gears / rack and pinion, linkages, cam and lever parts and shafts, which set the speed, torque and direction at the working end.
- The Wheels / castor wheels allow the machine or vehicle to move.
Block diagram
Power
DC geared motorMotor driverTransmission
DC geared motorGears / rack and pinionLinkages, cam and lever partsWorking unit
Linkages, cam and lever partsWheels / castor wheelsStructure
Frame and mountsComponents list and cost
Typical prices from Indian online stores and electronics markets (Lamington Road, Budhwar Peth, SP Road). Buy from one store where you can to save on shipping.
| Component | Qty | What it does | Approx. cost |
|---|---|---|---|
| DC geared motor | 2 | Provides the driving motion. | ₹500 |
| Motor driver (L298N) | 1 | Lets the low-current controller run the motors forward, reverse and at variable speed. | ₹180 |
| Gears / rack and pinion | 1 | Transfer motion and change speed or torque. | ₹500 |
| Linkages, cam and lever parts | 1 | Convert one type of motion into another. | ₹400 |
| Shafts (machined) | 1 | Transmit rotation and torque. | ₹400 |
| Mild steel frame and fabrication | 1 | Forms the main structure that holds all parts. | ₹2,500 |
| Robot chassis (metal / acrylic) | 1 | Needed for this type of build. | ₹1,100 |
| Wheels / castor wheels | 4 | Allow the machine or vehicle to move. | ₹1,600 |
| Li-ion battery pack (18650 × 3, 11.1 V) with BMS | 1 | Needed for this type of build. | ₹1,400 |
| Welding, cutting and machining labour | 1 | Needed for this type of build. | ₹2,200 |
| Legs | 1 | Part from the design specification | ₹400* |
| Rod | 1 | Part from the design specification | ₹400* |
| Couplings | 1 | Part from the design specification | ₹400* |
| Mounts, screws, nuts and small hardware | 1 | Enclosure, mounts and fasteners. | ₹300 |
| Paint, finishing and workshop consumables | 1 | Project overhead | ₹600 |
| Transport of material | 1 | Project overhead | ₹400 |
| Estimated total | Varies with brand, quality and city | ₹11,300 – ₹16,600 |
Prices are estimates for budgeting; items marked * depend on the exact size or model chosen. We confirm the bill of materials when your design is frozen, and components are charged at actual cost with bills.
How much does this project cost?
| Option | What you get | Cost |
|---|---|---|
| Components only | You buy the parts and build it yourself | ₹11,300 – ₹16,600 |
| Hardware / IoT Final Year | Working model or guided build, Circuit diagram and bill of materials, Firmware / code with explanation | from ₹9,999 + components |
| Capstone Project (CPE) | Working project or model, Black book in MSBTE format, Step-by-step explanation | ₹9,999 + components |
| Diploma ITR | 100% working source code, Project report PDF, PPT | ₹1,999 + components |
No GST and no hidden charges. Use the cost calculator for a quote with your deadline and add-ons, or see all plans.
Download the project brief (PDF)
Summary, working, components and cost and viva questions on one branded PDF to show your guide or team. To get it developed, contact us on WhatsApp.
What you submit with this project
- Working model with circuit diagram and program code
- Project report or black book in your university's chapter order (block diagram, circuit, calculations, results)
- Presentation for the review and final viva
- Synopsis for topic approval, if your college asks for one
Mechanical viva questions on this project
What is the aim of the Six Legged Spider Bot using Klann Mechanism project?
A six-legged walking robot built on the Klann linkage. A crank, rockers and couplers convert rotation into stepping motion, so the robot walks without a microcontroller or complex actuators.
Explain the working of your project in short.
The mild steel frame and fabrication forms the base that carries every other part, so it is designed first from the load and size of the machine. The DC geared motor provides the driving motion. The Motor driver lets the low-current controller run the motors forward, reverse and at variable speed. Motion is transmitted through DC geared motor, gears / rack and pinion, linkages, cam and lever parts and shafts, which set the speed, torque and direction at the working end.
Why is a geared motor used?
The gearbox reduces speed and multiplies torque, so a small DC motor can move a vehicle or mechanism smoothly. Torque increases roughly by the gear ratio.
Why can't the motor be connected directly to the microcontroller?
A motor needs far more current (hundreds of mA to amps) than a controller pin can supply (about 20–40 mA). The H-bridge driver switches the motor current and allows direction control.
What is the gear ratio?
The number of teeth on the driven gear divided by the number on the driving gear. A ratio of 3:1 reduces speed three times and increases torque about three times.
What does a cam-follower mechanism do?
It converts rotary motion of the cam into reciprocating motion of the follower, with the displacement profile set by the cam shape.
How is a shaft diameter selected?
From the torque and bending moment it carries: d³ = 16 T ÷ (π × allowable shear stress) for pure torsion, with a factor of safety.
Which material did you select for the main parts and why?
Mild steel (MS) is used for the frame because it is strong, cheap, easy to cut and weld and available everywhere. Shafts are made of EN8 or bright mild steel for strength, and parts that do not carry load can be aluminium or acrylic to reduce weight.
What factor of safety did you take in your design?
A factor of safety of 2 to 3 is taken for static parts and 3 to 5 for parts under shock or fatigue loading. Allowable stress = yield strength ÷ factor of safety, and each part is checked against it.
How did you estimate the cost of the project?
The cost is the sum of raw material, bought-out parts, machining or fabrication and overheads. Our estimate for this model is about ₹11,300 to ₹16,600, depending on size, material and the workshop rates in your city.
Which manufacturing processes were used?
Cutting and grinding of sections, arc or MIG welding of the frame, drilling for mounting holes, turning of the shafts and fitting of bearings and the drive, followed by assembly, alignment and painting.
Is your system open-loop or closed-loop?
Mainly open-loop: the controller runs the actuators for a set time or number of steps. Adding a sensor for feedback would make it closed-loop and more accurate.
Related projects
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Want to build Six Legged Spider Bot using Klann Mechanism?
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