Assessfy Pvt. Ltd Moderate 5 milestones 50 marks

3 Speed Gearbox Mechanism

Real-world project · AICTE-aligned · AI-graded · Audit-ready certificate

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About this project

3 Speed Gearbox Mechanism

Objective: Construct a functional 3-speed gearbox mechanism for mechanical power transmission.

Context: Efficient gear systems are vital in automotive and industrial machinery, sectors that are rapidly expanding in India. Understanding gearbox design is fundamental for mechanical engineering and manufacturing innovation.

What you'll build: You will calculate gear ratios, select appropriate gears and shafts, and design the transmission layout. Using tools like lathe and drilling machines, you'll fabricate and assemble the gearbox, ensuring proper fitting, lubrication, and casing. The mechanism will be tested under load to validate performance and durability.

Deliverables: A fully assembled and tested 3-speed gearbox prototype with supporting technical documentation.

Milestones

1. Gear selection and ratio calculation

10 marks 6d

Calculate and document the gear ratios for all three speeds, specifying the number of teeth for each gear and the resulting output speed for each selection. Submit a clear table or diagram showing gear arrangements and the mathematical steps used to determine the ratios. Ensure calculations are accurate and align with the intended speed outputs.

2. Shaft design and layout planning

10 marks 6d

Design the gearbox shafts, detailing their dimensions, materials, and placement relative to the gears. Submit a dimensioned layout drawing or CAD model showing shaft positions, bearing locations, and gear mounting. Verify that the design supports proper gear meshing and fits within the intended gearbox footprint.

3. Assembly and casing

10 marks 6d

Assemble the gearbox components, including gears, shafts, bearings, and casing. Submit photographs or a video of the assembled mechanism, along with a brief assembly report describing the process and any fit or alignment checks performed. Ensure the assembly is complete, secure, and the casing allows for maintenance access.

4. Testing under load

10 marks 6d

Test the assembled gearbox under simulated load conditions, recording performance data such as speed, noise, and temperature. Submit a test report with observations, measured values, and any issues encountered. Demonstrate that the gearbox operates smoothly at all three speeds without excessive vibration or failure.

5. Final presentation

10 marks 6d

Prepare a final presentation summarizing your gearbox design, calculations, assembly process, and testing results. Submit a slide deck or video walkthrough that clearly communicates your engineering decisions, challenges faced, and how you validated your design. Ensure the presentation is well-organized and visually supports your explanations.

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Upcoming sessions

Session	Window	Enrolled
3 Speed Gearbox Mechanism	11 Jun 2026 to 10 Jun 2028	0

Skills you'll learn

Gear ratio calculationTransmission system designMechanical drawing and fitting

Tools used

Gears and shafts Bearingscouplings Lathe machinedrilling machine Lubrication and assembly tools

Prerequisites

Fundamentals of gear trains Torque and speed relation Manual shifting mechanism

Available mentors

Priyang Kumar

Free

You'll earn — Certificate (PDF)

AICTE-aligned Project Completion Certificate

A formal, audit-ready PDF certificate issued by Assessfy + your institute on successful completion. Includes AICTE credit hours, your evaluator's signature, and a QR code for third-party verification.

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Certificate of Project Completion

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3 Speed Gearbox Mechanism

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3 Speed Gearbox Mechanism

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