ITI/NCVT Sheet Metal Worker (AITT Theory) study plan

Derive the true lengths of inclined lines by the triangulation method and rotate/auxiliary-view method, working through at least ten solved layout problems from first principles

Develop a full parallel-line pattern for a cylinder cut by an inclined plane, a square-to-round transition, and a right cone, checking each against a hand-drawn development

Compute bend allowance and setback from neutral-axis radius, thickness and bend angle, and convert flat-pattern lengths into marked blank sizes for five worked parts

Lay out a radial-line development for a truncated cone and verify the included angle of the development arithmetically

Build a one-page formula sheet covering circumference, mean diameter, seam allowance, bend allowance and stretchout factors

Select the correct snips type (straight, aviation left/right, compound) for a given cut path and justify the choice in writing

Cut straight, curved and internal profiles in 0.8 mm and 1.2 mm mild steel sheet to within 1 mm of a scribed line

Set up and operate a hand shear or treadle shear with correct blade clearance for the sheet thickness, and state the clearance rule

Form 90-degree flanges, a wired edge, a lap seam and a simple rolled cylinder by hand, checking squareness and diameter

Identify the causes of buckling, cracking and distorted edges during hand forming and list one remedy for each

Read a third-angle and first-angle sheet metal drawing and correctly identify plan, elevation, end view and the projection symbol used

Interpret dimensioning, tolerances, surface finish symbols, weld symbols and a bill of materials on two sample drawings

Sketch an orthographic set (three views) and an isometric view of a simple duct fitting to scale

Classify common sheet metals (mild steel, galvanised iron, stainless, aluminium, copper, brass) by composition, coating and typical workshop use

Match each hand tool (scriber, dividers, trammel, prick punch, ball-peen hammer, stakes, groover, seaming pliers) to its purpose and state one care or safety rule

Name and sketch at least eight edge and seam types (lap, grooved, double, Pittsburgh lock, standing seam, wired, riveted, dovetail) and state where each is used

Form a grooved seam and a Pittsburgh lock by hand and test each for pull-apart strength

Select rivet type, diameter and pitch for a given joint and calculate the number of rivets required for a specified seam length

Describe the correct procedure, flux and filler for soft soldering a galvanised lap joint, and list the cleaning steps before and after

Distinguish where soldering, brazing and fusion welding are appropriate for sheet metal joints, including heat-distortion risk

Identify the hazards of shearing, bending, rolling and pressing operations and state the guarding and interlocks required at each machine

Demonstrate correct lockout/tagout sequence and safe blade-gap setting on a press brake or shear in a simulated walkthrough

Select the correct PPE for cutting, grinding, welding and solvent handling, and explain why each item is required

Describe safe manual handling limits and correct lifting technique for sheet stacks, and state the workshop housekeeping and waste-segregation rules

Explain the function and safe operating limits of the roll former, press brake, nibbler, power shears and portable grinder, including capacity and throat-depth checks

Develop an oblique or transition piece (square-to-round or rectangular-to-round) by triangulation, calculating every true length without reference to a worked answer

Mark out a full-size development on sheet including seam allowance, bend lines, centre lines and cut lines, and cut it to tolerance

Use a height gauge, combination set, dividers and trammel points to transfer dimensions accurately to a workpiece

Check a marked-out blank for squareness using the 3-4-5 method and diagonal comparison, and record the deviation

Diagnose and correct three common layout errors (wrong stretchout, reversed development, omitted seam allowance) by re-deriving the correct figure

Calculate the blank size, number of parts per standard sheet and scrap percentage for three nested layouts

Estimate material, consumable, labour and overhead cost for a small fabricated job and quote a selling price with a stated margin

Draft a short professional email and a simple job record using a spreadsheet, including a formula for total material cost

Explain the employability expectations of the trade: punctuality, reporting, teamwork, and safe escalation of a hazard to a supervisor

Interpret a basic drawing file or PDF, save and name files to a workshop convention, and describe safe and lawful use of shop-floor computers

Complete two full-length timed mock papers under exam conditions and score each domain separately

Re-study only the two weakest domains identified by the mock scores and re-test those domains

Recite from memory the key formulas (bend allowance, stretchout, rivet pitch, development angles) and key safety rules without notes

Review all flagged or uncertain items from weeks 1 to 7 and resolve each to a confident answer

Build a final one-page revision card summarising the highest-yield facts across all twelve domains