Cutting Techniques Across Material Categories

This lesson covers the cutting techniques used for different material categories, as required by AQA GCSE D&T (8552), Section 3.2.5. Cutting is usually the first step in making any product — converting raw stock material into the required size and shape. Different materials require different cutting tools and techniques, and choosing the correct method is essential for accuracy, safety, and quality.

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Cutting Timber and Manufactured Boards

Hand Tools for Cutting Timber

Tool	Description	Best For	Teeth
Tenon saw	Short, stiff blade with a brass or steel spine for rigidity	Straight cuts in wood joints (tenons, shoulders); cutting to a marked line	Fine teeth (12-14 TPI); crosscut and rip
Coping saw	Thin blade held in a U-shaped frame; blade can be rotated	Cutting curves and intricate internal shapes in thin timber and manufactured boards	Very fine teeth; can cut in any direction
Hand saw (panel saw)	Long, flexible blade without a spine	Cutting large pieces of timber and sheet material to rough size	Medium teeth (8-10 TPI)
Fret saw	Similar to coping saw but with a deeper throat	Very intricate curved cuts in thin materials; greater reach than a coping saw	Very fine teeth

Machine and Power Tools for Cutting Timber

Tool	Description	Best For	Key Safety
Band saw	Continuous loop blade running over two wheels; table-mounted	Cutting curves in thick timber; resawing boards	Guards must cover the unused blade; hands must stay well clear
Scroll saw	Reciprocating blade mounted in a table; for very fine work	Intricate internal and external cuts in thin timber and MDF	Low risk — blade is short and slow; still requires guard
Circular saw (table saw)	Spinning disc blade mounted in a table	Straight rip cuts along the grain; cross cuts in sheet material	Crown guard, riving knife, push sticks — high risk tool
Laser cutter	Focused CO2 laser beam cuts or engraves material	Highly precise, intricate cuts in MDF, plywood, acrylic	Enclosed cabinet; fume extraction essential; never leave unattended
CNC router	Computer-controlled spinning cutting tool	Complex 2D and 3D shapes in timber and manufactured boards	Enclosed or guarded; ear protection; dust extraction

AQA Exam Tip: When describing a cutting process in the exam, name the specific tool (not just "a saw"), explain why it is suitable for the specific material and shape, and mention at least one safety precaution. This level of detail is what separates good answers from excellent ones.

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Cutting Metals

Hand Tools for Cutting Metal

Tool	Description	Best For
Hacksaw	Rigid frame holding a replaceable blade	Cutting metal bar, rod, tube, and sheet to size; general-purpose metal cutting
Junior hacksaw	Small hacksaw for lighter work	Cutting small metal sections, wire, thin tube
Tin snips (aviation snips)	Compound-lever hand shears	Cutting thin sheet metal (up to ~1.2 mm mild steel, thicker aluminium)
Files	Hardened steel bars with rows of cutting teeth	Removing material to shape, smooth, or deburr cut edges

Machine and Power Tools for Cutting Metal

Tool	Description	Best For
Band saw (metal-cutting)	Slower speed than wood-cutting version; coolant applied	Cutting bar stock, tube, and plate to size
Milling machine	Rotating multi-point cutter removes material from workpiece	Creating flat surfaces, slots, pockets, and complex shapes in metal
Lathe	Workpiece rotates; single-point cutting tool removes material	Turning cylindrical shapes, facing flat ends, drilling centre holes
Plasma cutter	Ionised gas jet melts and blows away metal	Cutting thick steel and aluminium plate rapidly; straight and curved cuts
Laser cutter (fibre/CO2)	Focused laser melts or vaporises metal	Very precise cuts in sheet metal (up to ~25 mm steel)
CNC milling/turning	Computer-controlled versions of milling machine and lathe	Highly accurate, repeatable machining of complex metal parts
Water jet cutter	High-pressure water mixed with abrasive garnet particles	Cutting any material without heat distortion; thick metals, composites, stone

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Cutting Polymers

Hand Tools for Cutting Polymers

Tool	Description	Best For
Scribing and snapping	Score a line with a craft knife or scribing tool, then snap along the score	Straight cuts in thin acrylic sheet (up to ~3 mm)
Coping saw	Standard coping saw works well on most polymers	Curved cuts in thin polymer sheet
Hacksaw (fine blade)	Standard hacksaw with a fine-tooth blade (24-32 TPI)	Cutting thicker polymer rod, tube, and sheet
Craft knife / Stanley knife	Sharp blade for controlled cuts	Cutting thin polymer film, foam board, Correx sheet

Machine and Power Tools for Cutting Polymers

Tool	Description	Best For
Laser cutter	CO2 laser is excellent for cutting acrylic and other thermoplastics	Highly precise, smooth-edged cuts; can engrave as well as cut through
Band saw	Works well for thicker polymer sections	Cutting curves in thick acrylic, nylon, or HDPE
CNC router	Computer-controlled for complex shapes	2D and 3D cutting and engraving in polymer sheet
Hot wire cutter	Heated wire melts through expanded polystyrene	Cutting EPS (expanded polystyrene) foam for packaging and models

AQA Exam Tip: Laser cutting is one of the most commonly examined manufacturing processes for polymers. Know that it uses a CO2 laser, produces very precise cuts with smooth edges, can cut and engrave, requires fume extraction, and is ideal for acrylic. Also know that it cannot cut PVC (releases toxic chlorine gas) — this is a favourite exam question.

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Cutting Textiles

Tool	Description	Best For
Fabric shears	Long-bladed scissors designed specifically for cutting fabric	Straight cuts in fabric on a cutting table
Pinking shears	Scissors with zigzag blades	Cutting fabric edges that resist fraying (the zigzag reduces fraying)
Rotary cutter	Circular blade rolled along a cutting mat	Straight, precise cuts in fabric; used with a ruler and cutting mat
Laser cutter	CO2 laser cuts and simultaneously seals edges of synthetic fabrics	Precise, intricate cuts in synthetic textiles; prevents fraying by melting edges
CNC fabric cutter	Computer-controlled knife or laser cuts multiple fabric layers	Mass production of garment pattern pieces; minimises fabric waste

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Choosing the Right Cutting Method

Factor	Consideration
Material	What material are you cutting? Different materials need different tools
Thickness	Hand tools are suitable for thin materials; thick materials need power tools
Shape	Straight cuts: saw, shears, laser. Curved cuts: coping saw, band saw, laser, CNC
Accuracy	For high precision: laser cutter, CNC. For rough sizing: hand saw, hacksaw
Quantity	One-off: hand tools or single laser cuts. Batch/mass: CNC, die cutting
Surface finish	Laser gives excellent edges; hand saws may need filing or sanding
Safety	All cutting tools are potentially dangerous; use guards, PPE, and correct technique
Cost	Hand tools are cheap; CNC and laser machines are expensive but efficient for large quantities

AQA Exam Tip: In a question about selecting a cutting method, always justify your choice by considering the material, the shape required, the accuracy needed, and the production volume. For example: "A laser cutter is suitable for cutting intricate shapes in 3 mm acrylic sheet because it provides high precision, smooth edges, and can follow complex CAD-generated tool paths."

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Summary