Cut and Shape Components

Cutting and Shaping Components

Chapter Introduction

This chapter covers all cutting and shaping operations for solid wood components, wood-derived panels, and veneers, as required by the cabinetmaker trade. For the Red Seal exam, you must master not only the technical procedures, but also material yield calculations, dimensional tolerances, machine safety rules, and applicable Canadian standards. This chapter is structured to cover competency blocks E (Cutting and Shaping) and H (Assembly and Finishing) of the National Occupational Analysis.

Cut Planning: Yield and Layout

Calculating Material Yield

Before any cutting, calculating material yield is essential to minimize waste and control costs. Yield is calculated as follows:

Yield (%) = (Usable surface produced ÷ Total surface of raw material) × 100

For wood-derived panels (MDF, particleboard, plywood), standard Canadian dimensions are 4 ft × 8 ft (1220 mm × 2440 mm) or 5 ft × 10 ft (1525 mm × 3050 mm). A 5 to 10% loss is normal for straight cuts; this can reach 15 to 20% for curved pieces or those with defects.

Calculation example: You need to produce 24 panels of 450 mm × 600 mm from 1220 mm × 2440 mm panels.

Surface area of one finished panel: 0.450 m × 0.600 m = 0.27 m²

Total surface area required: 24 × 0.27 = 6.48 m²

Surface area of one raw panel: 1.220 m × 2.440 m = 2.977 m²

Number of raw panels: 6.48 ÷ 2.977 = 2.18 → round up to 3 panels (always round up)

Actual yield: 6.48 ÷ (3 × 2.977) = 72.6%

Exam tip: Always account for the kerf (saw blade width), typically 3.2 mm for a standard circular saw and 2.5 mm for a panel saw. The kerf must be added between each piece when calculating layout positioning.

Layout and Marking

Layout must be done with precise tools: marking gauge, combination square, graduated ruler, and hard lead pencil (HB or 2H). For pieces that will be visible, use a fine pencil (0.5 mm) and mark the inside faces.

Layout rules:

Always mark on the face that will be hidden after assembly.

Mark pieces in pairs (left/right) using a coding system (e.g., A1, A2, B1, B2).

Use a cut line (fine line) and a finish line (thick line) to distinguish the rough cut from the final cut.

For joinery, mark mortises and tenons with a marking gauge set to the exact tenon thickness (generally 1/3 of the piece thickness).

Sawing: Saws and Techniques

Circular Saws

The table saw is the most used machine in a cabinetmaking workshop. For the exam, you must know:

Parameter	Recommended Value	Note
Rotation speed	3,000 to 4,000 RPM	Varies with blade diameter
Blade diameter	250 to 350 mm	Larger blade = deeper cut
Number of teeth	24 to 40 (crosscut); 40 to 60 (rip cut)	More teeth = smoother finish
Hook angle	10° to 15° for solid wood; 5° to 10° for panels	Reduce angle to prevent tear-out
Kerf	2.5 to 3.5 mm	Depends on blade thickness

Mandatory safety adjustments:

The riving knife must be aligned with the blade and located no more than 8 mm behind it.

The blade guard must cover the upper portion of the blade.

The rip fence must be securely locked; it must never be used as a guide during a crosscut.

The blade height must extend 3 to 6 mm above the workpiece.

Feed speed calculation: The feed speed (V) in m/min is calculated as follows:

V = (Number of teeth × RPM × feed per tooth) ÷ 1000

For a 40-tooth blade at 3,500 RPM with a feed of 0.1 mm/tooth:

V = (40 × 3,500 × 0.1) ÷ 1,000 = 14 m/min

Band Saws

The band saw is used for curved cuts, breaking down large sections, and resawing. Key points:

Blade width: 6 mm (fine cuts) to 40 mm (straight cuts). The general rule: blade width must be at least 3 times the height of the workpiece being cut.

Blade tension: 15,000 to 20,000 psi for carbon steel; 25,000 to 30,000 psi for bi-metal.

Minimum curve radius: R = (blade width × 3) ÷ 2. For a 12 mm blade, the minimum radius is 18 mm.

Blade welding: the weld must be flush and the teeth must be perfectly aligned.

Guide adjustment: Side guides must be 0.05 to 0.10 mm from the blade. The rear guide must be 0.5 mm behind the bottom of the tooth gullet.

Panel Saws

The panel saw (vertical or horizontal) is used for precise cutting of wood-derived panels. It allows precision of ± 0.2 mm. The cutting base must be equipped with a riving knife and a protective guard. The cut is generally done in two passes: a first scoring pass (main blade) and a second grooving pass (scoring blade) to prevent veneer chipping.

Shaping: Shapers, Routers, and Tenoners

Shapers (Moulders)

The shaper is used for profiling, grooving, rabbeting, and moulding. Rotation speeds range from 8,000 to 20,000 RPM depending on the tool diameter.

Maximum speed rule: The peripheral speed of the tool must not exceed 60 m/s. For a 100 mm diameter tool:

Maximum speed (RPM) = (60 m/s × 60) ÷ (π × 0.100 m) = 11,459 RPM

Direction of rotation and feed: The workpiece must always be fed against the direction of rotation of the tool (climb cutting is prohibited). The use of a fence (false fence or ball-bearing guide) is mandatory. A push stick must be used for pieces less than 300 mm in length.

Tooling:

Carbide cutters: service life 10 to 20 times greater than high-speed steel (HSS).

Moulder heads: must be dynamically balanced before use.

Spacers: allow cutting height adjustment in 0.1 mm increments.

Routers

The router is the versatile tool for grooving, profiling, template work, and drilling. Speeds range from 10,000 to 30,000 RPM.

Operation	Recommended Speed	Tool
Grooving in MDF	18,000 RPM	Grooving bit 6-12 mm
Edge profiling	16,000 RPM	Moulding bit
Template copying	12,000 RPM	Template bit with bearing
Drilling	20,000 RPM	Drill bit

Depth of cut rule: The maximum depth per pass is 1.5 × the bit diameter for grooves, and 0.5 × the diameter for profiles. For deep grooves, make several successive passes of 3 to 6 mm.

Template use: The copy template must be securely fastened to the workpiece. The template guide (bushing) must have an outside diameter that corresponds to the inside diameter of the template. The difference between the two diameters determines the cutting offset.

Tenoners and Mortisers

The double-end tenoner produces tenons on both ends of a piece simultaneously. The chain mortiser or hollow chisel mortiser creates mortises.

Standard tenon dimensions:

Tenon length: 2 to 3 × the piece thickness

Tenon width: 1/3 of the piece thickness

Shoulder: 2 to 3 mm minimum

Mortise depth calculation: The mortise depth must be 2 to 3 mm greater than the tenon length to allow for glue accumulation. For a 25 mm tenon, the mortise must have a depth of 27 to 28 mm.

Sanding and Surface Finishing

Mechanical Sanding

Sanding is a shaping operation by abrasion. Abrasive grits are classified according to the FEPA standard (Federation of European Producers of Abrasives):

FEPA Grit	Use	Note
P40 - P60	Roughing, stock removal	Removes 0.5 to 1 mm per pass
P80 - P100	Intermediate sanding	Prepares for fine sanding
P120 - P150	Fine sanding	Surface ready for stain
P180 - P220	Very fine sanding	Surface ready for varnish
P240 - P320	Between-coat sanding	Light scuffing
P400 and up	Finish sanding	Rubbing, polishing

Progression rule: Never skip more than one grit grade between two sanding operations. Going from P80 to P120 is correct; going from P80 to P180 risks leaving visible scratches.

Sanding with the grain: Final sanding must always be done in the direction of the wood grain. Sanding perpendicular to the grain (cross-sanding) leaves visible scratches after finishing.

Sanding Edges and Profiles

For edges and profiles, use a belt sander with a narrow belt (6 to 13 mm) or an oscillating spindle sander. Belt speed should be 300 to 500 m/min for solid wood and 200 to 300 m/min for veneers.

Gluing and Pressing

Types of Adhesives and Applications

Adhesive Type	Open Time	Water Resistance	Typical Use
White glue (PVA)	30-60 min	Low to moderate	Interior, furniture
Yellow glue (aliphatic)	20-45 min	Moderate	General woodworking
Polyurethane glue	60-120 min	Excellent	Exterior, damp wood
Urea-formaldehyde glue	30-90 min (with catalyst)	Excellent	Veneering, panels
Contact cement (neoprene)	Immediate	Moderate	Laminate, veneer

Application rule: Glue must be applied to both surfaces to be joined for PVA and aliphatic glues. The ideal amount is 150 to 200 g/m². Excess glue weakens the joint (starved joint effect).

Clamping time: Clamping time depends on temperature and relative humidity. At 20 °C and 50% relative humidity, the clamping time for PVA glue is 30 to 60 minutes. The minimum application temperature is 10 °C.

Presses and Gluing Pressure

Gluing pressure must be sufficient to bring surfaces into intimate contact without expelling all the glue:

Solid wood: 0.7 to 1.4 MPa (100 to 200 psi)

Veneer: 0.7 to 1.0 MPa (100 to 150 psi)

Wood-derived panels: 0.5 to 0.7 MPa (70 to 100 psi)

Clamping force calculation: For a gluing surface of 0.1 m² (1000 cm²) at a pressure of 1 MPa:

Force = Pressure × Surface = 1,000,000 Pa × 0.1 m² = 100,000 N = 10,200 kgf

A hand clamp exerts approximately 500 to 1,000 kgf. You would therefore need 10 to 20 clamps for this surface.

Safety and Canadian Standards

Machine Safety

All machines used for cutting and shaping must comply with the Occupational Health and Safety Act and applicable regulations. Key requirements:

Guards: must be in place and functional before any use.

Emergency stop: accessible and tested daily.

Lockout: mandatory before any maintenance or tool change, in accordance with CSA Z460-13 (Control of Hazardous Energy - Lockout and Other Methods).

Personal protective equipment (PPE): safety glasses, hearing protection (minimum 25 dB reduction), safety footwear, fitted clothing.

Rule 8-200 of the Canadian Electrical Code, Part I: This rule requires that machines be powered by a circuit protected by a ground fault circuit interrupter (GFCI) in damp environments. In workshops, stationary machines must be grounded and connected to dedicated circuits.

Ventilation and Dust

Wood dust is classified as carcinogenic by the Canadian Centre for Occupational Health and Safety. The exposure limit value (ELV) for wood dust is 1 mg/m³ (8-hour time-weighted average) for hardwoods, and 5 mg/m³ for softwoods.

The dust collection system must have a minimum capture efficiency of 90%. Transport velocities in ducts must be at least 20 m/s for fine dust and 25 m/s for chips.

Material Standards

Wood-derived panels used in cabinetmaking must comply with the following standards:

CSA O121: Hardwood Plywood

CSA O122: Softwood Plywood

CSA O153: Particleboard

ANSI A208.1: Particleboard (American standard often cited)

ANSI A208.2: Medium Density Fiberboard (MDF)

Formaldehyde emissions from panels must meet the limits of the Canadian Environmental Protection Act (CEPA). Panels must be certified CARB Phase 2 or EPA TSCA Title VI for North American markets.

Common Pitfalls to Avoid

115.Forgetting the kerf in yield calculations: Candidates often calculate the number of pieces without adding the saw blade width. Always add 3.2 mm between each piece.

116.Confusing rotation speed and peripheral speed: Rotation speed (RPM) is not the cutting speed. Peripheral speed (m/s) depends on the tool diameter. For a 200 mm tool at 10,000 RPM, the peripheral speed is 104.7 m/s — well above the 60 m/s limit.

117.Neglecting grain direction during final sanding: Final sanding must always be with the grain. Cross-sanding leaves scratches that appear after staining.

118.Using excessive clamping pressure: Too much pressure expels the glue and creates a starved joint (weak bond). Pressure must be sufficient for intimate contact, not to crush the wood.

119.Ignoring glue setting time: PVA glue requires a minimum clamping time of 30 minutes at 20 °C. Opening the press too early weakens the joint.

120.Not checking riving knife alignment: A misaligned riving knife causes dangerous kickback. It must be aligned with the blade and no more than 8 mm behind it.

121.Confusing abrasive grits: The FEPA numbering (P40, P80, etc.) is different from the ANSI numbering (grit). Always check which standard is being used.

122.Forgetting moisture content tolerances: Solid wood must be at 6 to 9% moisture content for interior use. Wood that is too damp (over 12%) will deform after assembly.

Summary

Material yield is calculated by dividing the usable surface by the total surface, including the kerf (3.2 mm) and 5 to 10% losses.

Layout must be precise, with calibrated tools, and pieces must be marked in pairs.

Circular saws require an aligned riving knife, blade guard, and locked rip fence.

Band saws are selected according to blade width (3× the workpiece height) and minimum curve radius.

Shapers operate at maximum peripheral speeds of 60 m/s; feed is always against the rotation.

Routers use bits suited to the operation, with depths of cut limited to 1.5 × the diameter.

Sanding follows a grit progression without skipping more than one grade, and final sanding is done with the grain.

PVA glues require 150 to 200 g/m² and a clamping time of 30 to 60 minutes at 20 °C.

Gluing pressure ranges from 0.7 to 1.4 MPa depending on the material.

Canadian standards (CSA O121, O122, O153) and safety rules (CSA Z460-13, Canadian Electrical Code Rule 8-200) must be respected.

The ELV for wood dust is 1 mg/m³ for hardwoods.

Final exam tip: On multiple-choice questions, read the units carefully (mm, m, MPa, RPM). The most common traps involve unit conversions and forgetting the kerf. Practice calculating yields and speeds without a calculator — the values are often chosen to be calculated mentally.