ITI/NCVT Mechanic Machine Tool Maintenance (AITT Theory) study guide
ITI/NCVT Mechanic Machine Tool Maintenance (AITT Theory) · Work through your exam, one topic at a time.
The All India Trade Test (AITT) is the certification assessment that closes out the NCVT ITI trade course in Mechanic Machine Tool Maintenance. It is aimed at trainees who are finishing institutional training in the trade and must show, in writing, that they understand how machine tools are built, installed, maintained, diagnosed and repaired. The ITI/NCVT Mechanic Machine Tool Maintenance (AITT Theory) study guide has 12 sections and about 4,092 words.
01Occupational Safety, Health and Environment in Machine Shops
Shop-floor safety, fire prevention, PPE, statutory duties, occupational disease and environmental control. Expect at least one numerical item, usually noise dose or ventilation.
348 words, about 2 min02Hand Tools, Measuring Instruments and Metrology
Least count, correct reading of vernier and micrometer instruments, calibration, limits and fits, and selection of the right gauge. Vernier least count = value of one main-scale division ÷ number of vernier divisions.
355 words, about 2 min03Fitting, Assembly, Alignment and Scraping of Machine Components
Bench skills – filing, sawing, drilling and tapping, reaming, dowelling – plus the alignment and hand-scraping techniques used when rebuilding machine tools. File grades from coarsest: rough, bastard, second cut, smooth.
348 words, about 2 min04Machine Elements, Power Drives and Transmission Systems
Belt, chain and gear drives, gear terminology, velocity ratio, couplings, clutches, keys and brakes – with simple numericals. Velocity ratio of a belt drive = N₁/N₂ = D₂/D₁.
344 words, about 2 min05Bearings, Lubrication, Seals and Tribology
Bearing type selection and identification, fits, lubrication method and grade, seal selection, and failure diagnosis. Plain bearings rely on a hydrodynamic oil film; they need a minimum speed and correct clearance.
359 words, about 2 min06Hydraulic and Pneumatic Systems and Their Maintenance
Circuit components, valve functions, cylinder force and speed calculations, contamination control and safe fault-finding. Pascal's law: pressure applied to a confined fluid is transmitted equally in all directions.
340 words, about 2 min07Machine Tool Installation, Levelling and Geometric Accuracy Testing
Foundation and foundation-bolt practice, levelling with precision levels, checking straightness, squareness and run-out, and acceptance tests to ISO 230-1. Sequence: prepare foundation, position machine on packing/shim plates, grout bolts, rough level, finish level after grout cures, then check geometry.
341 words, about 2 min08Maintenance Systems, Fault Diagnosis and Condition Monitoring
Maintenance strategy selection, reliability metrics, condition monitoring techniques and basic electrical checks on machine tools. Strategies: breakdown (reactive), preventive (time-based), predictive (condition-based), corrective.
302 words, about 2 min09Engineering Materials, Properties and Heat Treatment
Material selection, mechanical properties and the heat-treatment cycles that produce them, including common defects. Plain carbon steels by carbon content: low carbon (up to 0.3 %C) – ductile, weldable, used for structures; medium carbon (0.3–0.6 %C) – shafts, gears after heat treatment; high carbon (0.6–1.4 %C) – springs, files, drills.
328 words, about 2 min10Workshop Calculation and Science
Cutting-speed and feed calculations, taper and sine-bar trigonometry, gear and pulley ratios, and basic applied science. Cutting speed V (m/min) = πDN/1000, so N = 1000V/(πD).
330 words, about 2 min11Engineering Drawing and Reading of Machine Assemblies
Reading orthographic views, interpreting limits and fits, geometric tolerances, surface finish symbols, section views and assembly drawings. First-angle projection: the view is placed on the far side of the object, so the top view sits below the front view and the left-side view sits on the right.
361 words, about 2 min12Employability Skills and Workplace Practices
The non-technical half of the trade: communication, teamwork, self-management, entrepreneurship, financial and digital literacy, green practices, and awareness of labour law. Communication in the workshop is written and verbal: job cards, handover notes, tool issue slips and incident reports.
336 words, about 2 min