Draughtsman Mechanical Trade Theory - Year 2 (ITI)

Limits, fits and tolerances, surface finish, machine elements, couplings, bearings, gears, cams, jigs and fixtures, assembly and detail drawings, pipe and sheet metal drawings, and CAD drafting and modelling.

12 MonthsDuration 6Chapters31Topics

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Syllabus · पाठ्यक्रम

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01Unit 1: Limits, Fits, Tolerances and Surface Finish 5 topics

Basic size, deviation and tolerance
IS 919 system of limits and fits, hole basis and shaft basis
Clearance, transition and interference fits
Geometrical tolerances and symbols
Surface roughness (Ra), N-grades and machining symbols

02Unit 2: Machine Elements: Shafts, Keys, Couplings and Bearings 5 topics

Keys and keyways
Muff, flange, flexible, Oldham and universal couplings
Bushed bearing, plummer block and footstep bearing
Ball and roller bearing representation
Pulleys and belt drives

03Unit 3: Gears and Cams 5 topics

Gear terminology and module
Spur gear proportions and involute tooth profile
Helical, bevel and worm gears (conventions)
Types of cams and followers
Displacement diagrams and cam profiles

04Unit 4: Jigs, Fixtures and Assembly Drawings 5 topics

Purpose and elements of jigs and fixtures
Drill jigs and milling fixtures
Detail drawings and assembly drawings
Assemblies: screw jack, machine vice, tailstock, stuffing box, valves
Bill of materials and part numbering

05Unit 5: Pipe and Sheet Metal Drawings 5 topics

Pipe joints and fittings
Piping symbols and single-line pipe drawings
Isometric piping drawings
Sheet metal developments and allowances
Fabrication drawings

06Unit 6: CAD Drafting and 3D Modelling 6 topics

Advanced 2D commands, blocks and attributes
Dimension styles and tolerances in CAD
3D modelling: extrude, revolve, sweep, loft
Boolean operations: union, subtract, intersect
Generating 2D views and sections from 3D models
Plotting and file management

About

You will be able to

Apply limits, fits, tolerances, geometrical tolerances and surface finish symbols on drawings
Draw machine elements such as keys, couplings, bearings and pulleys in standard proportions
Draw gear tooth profiles and cam profiles from given data
Prepare detail and assembly drawings of machine units, jigs and fixtures with a bill of materials
Draw pipe line and sheet metal drawings
Produce 2D drawings and 3D models with CAD software and generate views from models

Who it is for

ITI Draughtsman Mechanical trainees - Year 2 (NCVT / DGT CTS)
Trainees preparing for the AITT and for design-office draughtsman jobs

What you need

Draughtsman Mechanical Year 1 theory and practical
Basic computer use for CAD

Questions

Which syllabus does this course follow?

The NCVT / DGT CTS (NSQF) Draughtsman Mechanical Trade Theory syllabus for Year 2. The centre follows the student's own ITI syllabus where it differs.

Is 3D modelling included?

Yes, the CAD unit covers basic 3D solid modelling and getting 2D views from the model.

Which CAD software is used?

AutoCAD is used for teaching; the same ideas apply to other CAD packages.

Will this help in getting a job?

Yes, reading and preparing detail and assembly drawings is the main daily work of a mechanical draughtsman.