BAS IC DESIGN AND TEC HNOLOGY
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Transcript of BAS IC DESIGN AND TEC HNOLOGY
BASIC DESIGN AND
TECHNOLOGY
JUNIOR HIGH SCHOOL-ONE
TOPICCUTTING TOOLS UNDER WOODWORK
DURATIO N
70 MINUTES
OBJECTIVES1.State three cutting tools under woodwork
2.Describe the uses of saws, chisels and planes
3.Sketch firmer and mortise chisels
THE CUTTING TOOLS UNDER WOOD-WORK
1.SAWS 2.PLANES
3.CHISELS
SAWSSawing is the process of cutting along and across the grain of timber
TYPES OF SAWSRIP SAW
It is used to cut along the grain of timber. It has a length of 700mm ,it has 4-6 teethper 25 mm
Blade
Handle
700MM
Teeth
CROSS-CUT SAWIt is used to cut across the grain of timber. It has a length of 600mm,it has 6-8 teeth per 25mm
600MM Handle
Blade
Teeth
TENON SAWIt is used for cutting tenon.It has a length of 400mm,its teeth is 2-4mm per 25mm Handle
Teeth
Back
Blade
PLANESPlanning is the process of removing unwanted portion from the surface of timber
TYPESSCRUBBING OR ROUGHING PLANE
It is used to remove the dirt or rough surface of a timber
Handle
Front knob
Body
Adjustable screwLever
cap
JACK PLANEIt is used after the roughing plane to even the surface of the wood.
HANDLE
BODY
ADJUSTABLE SCREW
LEVER CAP
FRONT KNOB
BLADE
SMOOTHING PLANEIt is used to smooth the surface of the wood
Blade
CHISELSChiseling is the process of removing waste from wood with a chisel
TYPES
It is used for cutting shallow grooves in timber or wood.
FIRMER CHISEL
Handle
Ferrule
Tang
Cutting edge
MORTISE CHISELIt is used for cutting deep grooves in a wood or
timber
Handle
Ferrule
TangBlade
Cutting edge
Mortise groove
MORTISE
EVALUATION 1.Differentiate between ripping and cross-cutting
2.Sketch and label the firmer chisel
3.Explain why the roughing plane is used before the jack plane
MEMBERSAbrantier theophilus:Klo-agogo L/A
J.H.S
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