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

THANK YOU