SAQA

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SOUTH AFRICAN QUALIFICATIONS AUTHORITY

REGISTERED UNIT STANDARD THAT HAS PASSED THE END DATE:

Demonstrate an understanding of various mechanical components

SAQA US ID	UNIT STANDARD TITLE
14488	Demonstrate an understanding of various mechanical components
ORIGINATOR
SGB Civil Engineering Construction
PRIMARY OR DELEGATED QUALITY ASSURANCE FUNCTIONARY
-
FIELD			SUBFIELD
Field 12 - Physical Planning and Construction			Physical Planning, Design and Management
ABET BAND	UNIT STANDARD TYPE	PRE-2009 NQF LEVEL	NQF LEVEL	CREDITS
Undefined	Regular	Level 5	Level TBA: Pre-2009 was L5	6
REGISTRATION STATUS		REGISTRATION START DATE	REGISTRATION END DATE	SAQA DECISION NUMBER
Passed the End Date - Status was "Reregistered"		2008-10-20	2009-04-08	SAQA 0160/05
LAST DATE FOR ENROLMENT		LAST DATE FOR ACHIEVEMENT
2010-04-08		2013-04-08

In all of the tables in this document, both the pre-2009 NQF Level and the NQF Level is shown. In the text (purpose statements, qualification rules, etc), any references to NQF Levels are to the pre-2009 levels unless specifically stated otherwise.

This unit standard is replaced by:

US ID	Unit Standard Title	Pre-2009 NQF Level	NQF Level	Credits	Replacement Status
263012	Demonstrate an understanding of mechanical components	Level 5	Level TBA: Pre-2009 was L5	10

PURPOSE OF THE UNIT STANDARD

This unit standard provides a broad introduction to the understanding of mechanical components. It is the starting point for a learner in this sector. The focus is knowledge, skills, values and attitudes in relation to the learner`s own context and experience of the world of work.

The qualifying learner is capable of:

Demonstrating an understanding of keys, pulleys, shaft couplings and screw threads

Demonstrating an understanding of bearings and lubrication

Demonstrating an understanding of gears and gear drives

Demonstrating an understanding of valves, pumps and pipe fittings

LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING

Learners accessing this unit standard will have demonstrated competence in mathematics, engineering science and technical drawing at NQF level 4 or equivalent.

Learners accessing this unit standard will have demonstrated competence in computer technology at Level 4 on the NQF or equivalent.

UNIT STANDARD RANGE

Mechanical components will include keys, pulleys, shaft couplings, screw threads, bearings, lubrication, gears, gear drives, valves, pumps and pipefittings.

Pulleys will include flat pulley, cone pulley, and pulleys with straight and curved spokes, solid pulley and split pulleys, single V-pulley and multi V-pulleys.

Shaft couplings will include the flange, pin type-flexible, Raffard, universal, muff, Oldham, marine and Bibby-type shaft couplings.

Couplings and clutches will include claw clutch, spiral jaw clutch, single and multiple disc clutches, cone clutch and centrifugal clutch.

Screw thread profiles will include V-shaped ISO metric screw thread, pipe thread, acme thread and buttress screw thread (included angles in degrees where applicable must be shown).

Screw thread terminology will include nominal diameter, pitch diameter, root diameter, pitch, lead, included angle of thread, external and internal screw thread, left-hand screw thread, single-start and multi-start screw thread.

Bearing types will include radial, ball, roller, thrust, guide, angular load and self-aligning bearings.

Lubricating devices will include (gravity feed): siphon wick, sight feed and needle lubrications; (grease lubrication): stauffer grease cup and telltale grease cup; (splash lubrication) oil ring lubricator and oil bath.

Gear drives will include spur, bevel, helical, rack and pinion, worm and worm wheel, internal, epicyclical and hypoid gears.

Gear terminology will include addendum, dedendum, nominal diameter, root diameter, pitch circle diameter, pitch circle, circular pitch, base circle, pressure angle, module, circular tooth thickness, chordal thickness, line of action, fillet radius, number of teeth, full depth of tooth, working depth of tooth, clearance and backlash.

Valves will include non-return, pressure relief and stop valves.

Pipefittings will include socket, cat, tee, tube, elbow and flanged bend.

Major parts of valves, pumps and pipe fittings will include flanged pipe couplings, heavy duty flanges, simultaneously screwed and welded flanges, expansion bends and expansion joints.

Pumps will include ram and eccentric, oscillating cylinders, centrifugal vane pumps, gear pump, diaphragm pump, disc valve pump and screw pump.

Specific Outcomes and Assessment Criteria:

SPECIFIC OUTCOME 1

Demonstrate an understanding of keys, pulleys, shaft couplings and screw threads

ASSESSMENT CRITERIA

ASSESSMENT CRITERION 1

1. The different types of keys used in engineering are described and their functions and practical applications are explained.

ASSESSMENT CRITERION 2

2. The different types of keys used in engineering are drawn.

ASSESSMENT CRITERION 3

3. Different machining processes to obtain keyways are explained.

ASSESSMENT CRITERION 4

4. The purposes, working principles and uses of pulleys are described and drawn.

ASSESSMENT CRITERION 5

5. The purposes, working principles and uses of shaft couplings are described and drawn.

ASSESSMENT CRITERION 6

6. The differences in working principles and application between coupling and clutches is compared and explained.

ASSESSMENT CRITERION 7

7. Different screw thread profiles are explained by means of drawings.

ASSESSMENT CRITERION 8

8. Screw thread terminology on a drawing is defined and indicated.

SPECIFIC OUTCOME 2

Demonstrate an understanding of bearings and lubrication

ASSESSMENT CRITERIA

ASSESSMENT CRITERION 1

1. Plain bearings are identified and their functions and practical uses described.

ASSESSMENT CRITERION 2

2. Each type of plain bearing is drawn and named.

ASSESSMENT CRITERION 3

3. Anti-frictional bearings and their functions and practical uses are described.

ASSESSMENT CRITERION 4

4. Each type of anti-frictional bearing is drawn and named.

ASSESSMENT CRITERION 5

5. The advantages and disadvantages of plain and anti-frictional bearings are listed and described.

ASSESSMENT CRITERION 6

6. The theory of lubrication is explained and the properties of a good lubricant are described.

ASSESSMENT CRITERION 7

7. The working principles of lubricating devices are explained.

ASSESSMENT CRITERION 8

8. The main functions of lubricants for ball and roller bearings are listed and explained.

ASSESSMENT CRITERION 9

9. The sealing methods for sealing roller, ball and thrust bearings are explained.

SPECIFIC OUTCOME 3

Demonstrate an understanding of gears and gear drives

ASSESSMENT CRITERIA

ASSESSMENT CRITERION 1

1. The advantages of gear drives are listed and explained in accordance with organisational definitions.

ASSESSMENT CRITERION 2

2. The reasons for using gear drives are listed and explained in accordance with accepted definitions.

ASSESSMENT CRITERION 3

3. The different gear drives are drawn and named.

ASSESSMENT CRITERION 4

4. Gear terminology is defined and indicated on a drawing.

ASSESSMENT CRITERION 5

5. Formulae and calculated sizes are given in order to construct involutes gear tooth profiles for representation purposes.

SPECIFIC OUTCOME 4

Demonstrate an understanding of valves, pumps and pipe fittings

ASSESSMENT CRITERIA

ASSESSMENT CRITERION 1

1. The functions of valves, pumps and pipe fittings are described in accordance with manufacturers requirements.

ASSESSMENT CRITERION 2

2. A free-hand drawing is produced which explains the working principles of valves within agreed time frames.

ASSESSMENT CRITERION 3

3. A free-hand drawing is produced which shows the use of pipe fittings within agreed time frames.

ASSESSMENT CRITERION 4

4. A labelled, free hand drawing is produced of major components of valves, pumps and pipe fittings within agreed time frames.

ASSESSMENT CRITERION 5

5. The working principles of pumps are described in accordance with manufacturers instructions.

UNIT STANDARD ACCREDITATION AND MODERATION OPTIONS

The relevant Education, Training, Quality Assurance Body (ETQA) will accredit providers offering learning towards this standard, and register assessors.

UNIT STANDARD ESSENTIAL EMBEDDED KNOWLEDGE

A general understanding of mechanical components.

A broad understanding of keys, pulleys, shaft couplings and screw threads.

A broad understanding of bearings and lubrication.

A broad understanding of gears and gear drives.

A broad understanding of valves, pumps and pipefittings.

An in-depth understanding of the methods and techniques for producing drawings of mechanical components.

Critical Cross-field Outcomes (CCFO):

UNIT STANDARD CCFO IDENTIFYING

Identify and solve problems in which drawings and explanations display an effective way of overcoming problems by creative thinking.

UNIT STANDARD CCFO COLLECTING

Collect, analyse, organise and critically evaluate information pertaining to drawings and the interpretation of it.

UNIT STANDARD CCFO COMMUNICATING

Communicate effectively via drawings.

UNIT STANDARD CCFO DEMONSTRATING

Understand the world as a set of related systems in understanding the link between mechanical components and drawings.

UNIT STANDARD NOTES

This unit standard has been replaced by unit standard 263012, which is "Demonstrate an understanding of mechanical components", Level 5, 10 credits.

QUALIFICATIONS UTILISING THIS UNIT STANDARD:

	ID	QUALIFICATION TITLE	PRE-2009 NQF LEVEL	NQF LEVEL	STATUS	END DATE	PRIMARY OR DELEGATED QA FUNCTIONARY
Core	23773	National Certificate: Computer Aided Drawing Office Practice	Level 4	NQF Level 04	Passed the End Date - Status was "Registered"	2006-02-09	Was CETA until Last Date for Achievement
Elective	50018	Further Education and Training Certificate: Computer Aided Drawing Office Practice	Level 4	NQF Level 04	Passed the End Date - Status was "Registered"	2009-02-09	Was CETA until Last Date for Achievement

PROVIDERS CURRENTLY ACCREDITED TO OFFER THIS UNIT STANDARD:

This information shows the current accreditations (i.e. those not past their accreditation end dates), and is the most complete record available to SAQA as of today. Some Primary or Delegated Quality Assurance Functionaries have a lag in their recording systems for provider accreditation, in turn leading to a lag in notifying SAQA of all the providers that they have accredited to offer qualifications and unit standards, as well as any extensions to accreditation end dates. The relevant Primary or Delegated Quality Assurance Functionary should be notified if a record appears to be missing from here.

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