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 Page 27/49 Date 29.01.2017 Size 3.25 Mb. #11610

TECHNICAL DRAWING

SSII THIRD TERM

 WEEK TOPIC/CONTENT ACTIVITY 1 PLANES AND VIEWS IN SPACE:- Key terms in planes and views in space. Line inclined to horizontal and vertical plane. Explains terms used in plane in space -vertical plane (VT) Horizontal plane(ht) Angle of inclination:- Draw true length and true angle of a line inclined to horizontal and vertical planes:- Models projector, drawing instruments and materials. 2 ORTHOGRAPHIC PROJECTION:- Definition principles and types of orthographic projections. Define, explain and describe the principle of orthographic projection:- Participate actively in class discussion:- Models, charts. 3 ORTHOGRAPHIC PROJECTIONS:- Orthographic views (first and third angles). -demonstrate how to draw and dimension orthographic views:- Observe and draw orthographic views from given pictorial views:- Drawing instrument and materials. 4 Orthographic projection:- Conversion of given orthographic views to isometric vies. Demonstrate how to draw isometric view from any given orthographic view:- Observe and draw isometric view from given orthographic view:- Drawing instruments. 5 BUILDING DESIGN AND WORKING DRAWING:- Building design process. Explains building design process:- Participation in building design process: - building plan sketches. 6 BUILDING DESIGN AND WORKING DRAWING:- Prevention of working drawings showing a)building plans b)elevations c) electrical & plumbing symbols d) Dimensions. Guide the students to design building to meet given specifications:- Design building to meet given specifications:- Models and posters. 7 BUILDING DESIGN AND WORKING DRAWINGS:- Types of building to be design. Guide students in the preparation of working drawings showing building plans, elevations dimensions electrical and plumbing symbols of different of building types:- Prepare building plans from sketches of different building types:- Models and posters. 8 DETAILS OF PARTS OF BUILDINGS:- Identification of parts of building. Guide students to identify parts of a building:- Identify parts of a building:- Posters. 9 DETAILS OF PART OF BUILDINGS:- Detail building drawing : (foundations, floors, walls opening and lintels). Guide students to draw details of a building with dimension:- Draw the details of a building and indicate members and dimensions:- Charts. 10 DETAILS OF PARTS OF BUILDINGS:- Roof types and roof members: pitch roof, cable roof, hipped roof etc, rafters wall plates king post purloins etc. Guide students to draw, identify roof types Guide students to draw roof members:- Identify roof types, and draw roof members:- Diagrams. 11 Revision Revision 12 Examination Examination 13 Examination Examination

SENIOR SECONDARY TECHNOLOGY

METAL WORK

SS 2 FIRST TERM

METAL WORK

SS 2 SECOND TERM

 WEEK TOPIC AND CONTENT ACTIVITIES 1 arc welding, Definition of arc welding. Basic types of arc welding. (i)Non consumable electrode arc welding. (ii) Consumable electrode arc welding. The teacher Defines arc welding and write down the principle involved in establishing the arc. Mention basic types of arc welding and give students work pieces of a given dimension with an electrode to weld a butt joint. 2 Consumable electrode arc overcalling, Definition of arc welding -maintenance of the arc. -metal transfer across the arc. The teacher Defines arc welding. students scratch the electrodes on the parent metal with draw it to a height arc length (1.5m) and maintains it at that length through out the weld. 3 Shielded metal arc welding (swam), -principle of operation -SMAW equipment (I) D.c transformer. (ii)Electrode holder (iii)Flexible cable electrode. Explain the principle of operation of (SMAW) Show the SMAW equipment to students and ask them to put them into use in the workshop -Using electrode connected to the electrode holder. -connect the electrode holder to the feasible able which leads directly into the transformer. The D.C. State the source of supply of the AC -Explain how rectifier reduces the AC connect to the welding connect. 4 Striking the arc, Taping method Scratching method. In order to establish an:-There are two methods which involves touching the electrode with the base metal and with drawing it to a length for the arc to be established scratching motion involves scratched the electrode on the parent metal in the motion the marches is being scratched. 5 Electrodes, Function of electrode coating Classification of electrode State that the flux coating prevents the weld from at mospheric contamination and for protective should on the weld. Classify electrodes according to welding conditions. 6 Essential factors for maintaining high quality weld. -Connect electrode type -connect electrode size -connect current -connect arc length -connect travel speed -connect electrode angle -connect manipulation of spatter. In maintaining high quality weld student must select connect size of electrode to suit connect .maintaining the speed of the weld and angle inclination of the electrode. 7 Arc welding position , Arc welding joint , Over-head welding Vertical welding Horizontal welding. Explain the welding position and state the factors that governs the process -place mild steel plate of specified size for student to weld in horizontal position, overhead position and overhead position 8 Riverts, -types and use -sheet metal work -Hard work -machine work. Teacher mentions the various types of rivet and state their uses and where they are important State the advantage of rivet joints students should produce various rivet and drill mild steel plate to have a round hole the hammer them together to have a rivet joint by loud. Use also machine to loud machine rivet. 9 Basic sheet metal work hand tools and equipments. Sheet metal work operation:- Cutting tools:- Hand shares (snips) Bench shares Bench tools: stakes, Bick, iron, Hammer, Mattets etc. Machine for sheet metal work Gillotine, Bending Rollers, universal jenny folding machine -Bending -Flanging -wiring (B) Sheet metal work joints. -Grooved seam, paned down know up, ship on joint and ship in joint Demonstrate the cutting of sheet metals using guillotine, use bending rollers to bend the sheet metal. Ask students to use universal jenny folding machine folding student should use hammer and mallets to beat the folded metals to shape for finishing. 10 Pattern development (A)method of pattern development radial line, triangulation parallel line (B)types of pattern:-rectangular, plain, cylindrical, conical section.etc. -cylindrical calendaring -internal gridding and surface grinding. Cut their sheet of mild steel plate and flanch the edge bend, the edges for safety and use wire for rounding up the bottom. And mallet it down. to shape (wired edge) Work out the bending allowance for the know up joints, bend the metal to the shape required and use ships to cut the excess metal away for tarnishing. Explain method of pattern development state types of patterns used for plain, cylindrical and conical sections etc. -Develop simple patterns of shape using parallel lines radial and triangulation method and transfer it to the work piece. Demonstrate the grinding operation using the grinding disk for both internal and external surface. 11 Revision Revision 12 Examination Examination