Required skills include

Ability to

interpret mill flow diagrams

perform contingency planning for equipment breakdown including failure mode effects analysis

balance dressing surfaces across break and reduction stages

adjust break rolls to take into account

number of break stages

grist composition

specification of finished product

estimate break roll percentages through visual examination hand stratification and test sieving

Required knowledge includes

Knowledge of

alternative and historical milling techniques including

stone grinding

low or one pass through grinding

use of small manual or electric milling machines

semolina process vs traditional flour milling process

conventions and techniques in drawing mill flow diagrams

characteristics of different grists and their milling requirements

purpose design and steps in the break process including

overall aim of removing bran from endosperm in large pieces while minimising bran powder and flour

roller design

flute design

roller speed

number of passages

destinations of product from each break roll

purpose design and principles of the purification process including

sieve design

role of sifting shaking gravity and aspiration upward air

screening decks

exhaust ports and chambers

collection of throughs

overtails

relationship of purification to later reduction stages

scratch equipment and process to remove small pieces of bran and germ from endosperm after sizing or purification

relationship of particle size to reduction roller efficiency

reduction which grinds flour into required fineness while controlling damage to starch granules and minimising abrasion to any bran and germ particles present

features and performance characteristics of milling equipment as specified in manufacturers reference material

relationship between total dressing surface ratio to mill capacity

calculation of break roll percentages

mill balance requirements and techniques including

ensuring that stock does not return to immediate preceding passage or equipment

feed to first break at a constant rate

evenness of feed into rolls

maintenance of conveyor and air settings to achieve constant feed

calculation of mill performance including

invisible loss rate

theoretical and actual milling loss rate

The evidence guide provides advice on assessment and must be read in conjunction with the performance criteria required skills and knowledge range statement and the Assessment Guidelines for the Training Package

Overview of assessment

Assessment must be carried out in a manner that recognises the cultural and literacy requirements of the assessee and is appropriate to the work performed Competence in this Unit must be achieved in accordance with food safety standards and regulations

Critical aspects for assessment and evidence required to demonstrate competency in this Unit

Evidence of ability to

interpret mill flow diagrams and production requirements

set and monitor break and reduction system equipment

achieve flour recipes through correct use of grists and mill settings

adjust mill settings for breakdowns and other contingencies

Context of and specific resources for assessment

Assessment must occur in a real or simulated workplace where the assessee has access to

personal protective clothing and equipment

work procedures including advice on safe work practices food safety quality and environmental requirements

equipment manuals including operating parameters

specifications control points and processing parameters

break and reduction roll process and related equipment and services

conditioned grain suitable for the break and reduction roll process

sampling schedules and test procedures and equipment as required

documentation and recording requirements and procedures

cleaning procedures materials and equipment as required

Method of assessment

This Unit should be assessed together with core Units and other Units of Competency relevant to the function or work role

Guidance information for assessment

To ensure consistency of performance competency should be demonstrated on more than one occasion over a period of time in order to cover a variety of circumstances cases and responsibilities and where possible over a number of assessment activities

Mill

Mill flow diagram

Mill balance

Grain acceptance specifications may include:

Grinding can refer to:

Extraction rate

Optional equipment

Throughs

Overtails

Wheatfeed

Scalping

Roll adjustment