ITI/NCVT Tool & Die Maker (AITT Theory)

It is a written trade-theory paper in the objective style used for All India Trade Test theory across NCVT trades, with a calculation component drawn from workshop science. Candidates answer on the supplied answer sheet under invigilation. The exact structure, item count and marking scheme for your session are published by the official authority - check the current NCVT/AITT notification rather than relying on a previous batch's paper.

Together, toolmaking and press tools carry roughly a third of the weight in the published scheme, which makes them the single biggest block. In practice you should expect questions on die sets, punches and dies, clearance, strippers, pilots, stops, cutting and forming operations, jigs and fixtures, location principles and clamping. Treat this block as your priority, not an optional extra.

Most failures are not caused by the paper being obscure - they come from weak recall of standard values and terminology. If you can name the parts of a progressive die, explain clearance's effect on burr and tool life, and do blank-size and shear-force sums without a formula sheet, you are in good shape. Candidates who only memorised shop practice without the underlying reasons tend to struggle on the applied items.

NCVT provides a supplementary/re-examination route for failed subjects under its own rules and windows, but the eligibility conditions, permissible attempts and any backlog limits change between sessions. There is no fixed, universal answer to quote here. Read the current AITT instructions for your batch and confirm with your ITI's examination cell before assuming a date or a number of attempts.

Those figures are set by the official body for each session and are not constant, so any number quoted on a study site ages badly. Look at the current NCVT/AITT scheme of examination and the admit card instructions for the confirmed duration and item count. Plan your preparation around the syllabus weighting rather than around a rumoured time limit.

Start with engineering drawing and workshop calculation, because every later topic leans on them - you cannot size a blank or read a die assembly without them. Then take toolmaking and press tools as one continuous block. Follow with machine tools, then materials and heat treatment, then bench fitting and measurement. Keep safety and CNC as short, high-retention revision topics rather than a main study phase.

Unit slips dominate: mixing millimetres and metres in shear-force work, forgetting to halve a diameter for radius, or using the wrong shear strength for the material specified. Also common is quoting clearance as a single number when the question wants it per side. Write the formula, substitute with units shown, and sanity-check that a punch force is measured in newtons or kilonewtons, not in millimetres.

You need the widely used ones that appear in trade practice: the IS designation for tool steels, common drill and tap sizing relationships, and standard fits and tolerances. You do not need to reproduce whole standards tables from memory. Learn what a designation tells you - carbon content, alloying element, application - because questions usually test interpretation rather than verbatim recall.

Anchor your thinking in the six degrees of freedom: a good answer identifies which freedoms the locators remove and which the clamps merely hold against. Learn the difference between locating and clamping, the 3-2-1 principle, and why diamond pins and relieved locators exist. Questions often present a workpiece shape and ask which locating arrangement suits it, so practise matching features to locators.

It helps but is not a substitute for theory. Trainees who have actually set a die, adjusted a clearance or measured a worn punch tend to answer applied items faster because they can picture the setup. That said, the paper rewards explicit knowledge of why a parameter matters, so convert your shop experience into written explanations and worked numericals during revision, not just into familiarity with the machines.