Competency must be assessed on the job or in a simulated environment. 6.2 The assessment of practical skills must take place after a period of supervised practice and repetitive experience.
________________________________________________________________________________________________________________ TR FOUNDRY PATTERNMAKING NC II Promulgated 28 CORE COMPETENCIES UNIT OF COMPETENCY: DEVELOP AND MANUFACTURE WOOD PATTERN UNIT CODE: ALT742301 UNIT DESCRIPTOR: This unit covers developing and manufacturing wood patterns, both regular shaped and split patterns, based on an understanding of casting and molding principles. ELEMENT PERFORMANCE CRITERIA Italicizedterms are elaborated in the Range of Variables 1.Determine job requirements 1.1 Job instructions and specifications are interpreted correctly. 1.2 Type of wood pattern required is determined through application of molding/casting techniquesand foundry processes. 1.3 Appropriate timber/timber compositesare selected to meet specification. 2. Develop and lay out wood patterns 2.1 Pattern parameters are calculatedto specification e.g. angles, tapers, clearances, contractions etc. 2.2 Pattern is laid out showing tapers, machining allowances, core prints and method of construction to specification. 2.3 Jigs and fixtures are developed and manufactured to aid wood pattern manufacture as required. 3.Manufacture wood patterns 3.1 Materials are marked out and construction is developed to meet specification. 3.2 Pattern or pattern component parts are produced to size and shape and checked for conformance to specifications using acceptable wood pattern making techniques and procedures and utilizing appropriate hand and handheld power tools. 3.3 Pattern component parts are joined or fixedas required and checked for conformance to specification. using acceptable wood pattern making techniques and procedures 3.4 Pattern is correctly marked, color-coded or tagged according to specifications or standard operating procedures.
________________________________________________________________________________________________________________ TR FOUNDRY PATTERNMAKING NC II Promulgated 29 RANGE OF VARIABLE VARIABLE RANGE 1.Molding/casting techniques 1.1 The variety of sand molding techniques and sand mediums 2.Timber/timber composites 2.1 Hardwood 2.2 Softwood 2.3 Laminates 2.4 Plywood 2.5 Veneers and bonded fiberboard 3. Calculations Calculations include the determination of: 3.1 Contraction rates, 3.2 General engineering calculations 4. Joining and fixing Joining and fixing may include: 4.1 Glued 4.2 Screwed 4.3 Nailed 4.4 Stapled
________________________________________________________________________________________________________________ TR FOUNDRY PATTERNMAKING NC II Promulgated 30 EVIDENCE GUIDE 1.Critical aspects of competency Assessment requires evidence that the candidate: 1.1 Determined job requirements 1.2 Developed and lay out wood patterns 1.3 Manufactured wood patterns 2. Underpinning knowledge and attitudes 2.1 Kinds of timber products including features, characteristics and applications 2.2 Molding and casting techniques 2.3 Tools required for casting/molding 2.4 Jigs and fixtures methods of construction 2.5 Formulas and mathematical techniques required for necessary manufacturing of patterns/core boxes i.e.