Question 1

What is the difference between CNC routing and laser cutting for timber?

Accepted Answer

CNC routing uses a rotating cutting bit to physically remove material, making it suitable for thicker timbers and 3D shapes like contours. Laser cutting uses a focused beam to burn or vaporise the material, offering high precision for intricate 2D shapes but limited to thinner sheets (typically up to 10mm). CNC routing is slower but can handle larger volumes, while laser cutting is faster for small batches with fine detail.

Question 2

How does steam bending work and what timbers are best?

Accepted Answer

Steam bending involves exposing timber to steam (around 100°C) to soften the lignin, making it flexible. The timber is then bent around a former and clamped until dry. Best timbers are those with straight grain and high flexibility, such as ash, oak, and beech. Avoid brittle timbers like pine, which may split. This process is used for curved furniture parts like chair backs and boat ribs.

Question 3

What is laminating in timber manufacturing?

Accepted Answer

Laminating involves gluing together multiple thin layers of timber (veneers) with the grain direction alternating, then pressing them in a mould to form a curved or shaped product. The cross-grain layers add strength and reduce warping. Common examples include bentwood chairs, skateboards, and plywood. Laminating allows for complex curves that would be impossible with solid wood.

Question 4

Why are jigs and templates important in batch production?

Accepted Answer

Jigs and templates ensure consistency and accuracy when producing multiple identical parts. A jig guides a tool (e.g., a drill bit) to the exact position, while a template is used to mark or cut shapes repeatedly. They reduce setup time, minimise errors, and allow less skilled workers to produce high-quality parts. For example, a drilling jig ensures all screw holes are aligned in a batch of furniture.

Question 5

Can laser cutting be used for mass production of timber products?

Accepted Answer

Laser cutting is generally not used for mass production of large timber products because it is slow for thick materials and has high energy costs. However, it is excellent for mass-producing small, intricate parts like plywood components for flat-pack furniture or decorative items. For high-volume production of larger items, CNC routing or die-cutting is more efficient.

Question 6

What scale of production is steam bending typically used for?

Accepted Answer

Steam bending is most commonly used for one-off or small batch production because it requires skilled labour, custom formers, and long drying times. It is not suitable for mass production due to the time and cost involved. However, in some cases, like the production of traditional Windsor chairs, it can be used for medium batches with multiple formers.

Timbers: Alternative processes that can be used to manufacture typical timber products to different scales of production

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