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Date May 2022 Marks available 2 Reference code 22M.2.SL.TZ0.5
Level SL Paper 2 Time zone no time zone
Command term List Question number 5 Adapted from N/A

Question

In 1858 Leonard Bailey produced the Bailey Wood Plane. The body of the plane was made from cast iron rather than timber. It also had a cam lever lock to secure the lever cap (a). In 1867 he added a longitudinal adjuster – a “Y” lever operated by a screw set vertically behind the cutting unit (b).

Despite the development of electric wood planes, the Bailey Wood Plane is still used in workshops today, see Figure 5.

Figure 5: Bailey Wood Plane

Figure 5: (Left) gresei / iStock.    (Right) mamonovstanislav / 123RF.

List two properties that made cast iron a suitable material for the Bailey Wood Plane.

[2]
a.

Explain why the Bailey Wood Plane is an example of an innovation.

[3]
b.

Explain how the Bailey Wood Plane demonstrates omnipresence and dominant design.

[6]
c.

Explain why perspective drawings, orthographic drawings and exploded isometric drawings would be used in the design of the Bailey Wood Plane.

[9]
d.

Markscheme

hardness;

high density;

toughness;

 

Award [1] for listing each property that made cast iron a suitable material for the Bailey Wood Plane up to [2 max].

a.

innovation is putting an invention in the marketplace and making it a success;

the wood plane offers adjustability;

increasing the popularity/demand for the product/diffusion into the marketplace;

 

Award [1] for each of three distinct points in an explanation of how the Bailey Wood Plane is an example of an innovation up to [3 max].

b.

Omnipresence:

the wood plane was invented in 1858;

meaning it has existed/been in circulation for a long time;

and continues to be used today (without change to the original design);

 

Dominant design:

dominant design contains features of a product that are recognized as essential (by a majority of manufacturers and purchasers);

the wood plane contains a lever cap/adjuster/flat base/blade/handles;

which are essential for the user to successfully plane wood/fulfil its function;

 

Award [1] for each of three distinct points in an explanation of how the Bailey Wood Plane demonstrates omnipresence up to [3 max].

Award [1] for each of three distinct points in an explanation of how the Bailey Wood Plane demonstrates dominant design up to [3 max].

Mark as [3] + [3].

c.

Perspective drawings:

provide a (realistic) 3D representation of the product;

using foreshortening/converging lines/vanishing points;

which can be used to communicate to clients/for marketing/promotional purposes;

 

Orthographic projection:

show the product from multiple 2D views (top/front/side);

and provide dimensions/scale;

which are helpful to communicate between designers/manufacturers;

 

Exploded isometric drawings:

a 3D drawing technique that illustrates the component parts separated (drawn on a 30º angle);

used to show all the parts of the Bailey Wood plane (how they assemble/fit together);

which helps the user with repair/assembly/maintenance of the product;

 

Award [1] for each of three distinct points in an explanation of why perspective drawings would be used in the design of the Bailey Wood Plane up to [3 max].

Award [1] for each of three distinct points in an explanation of why orthographic drawings would be used in the design of the Bailey Wood Plane up to [3 max].

Award [1] for each of three distinct points in an explanation of why exploded isometric drawings would be used in the design of the Bailey Wood Plane up to [3 max].

Mark as [3] + [3] + [3].

d.

Examiners report

An accessible question. Hardness/toughness were common responses, but often not both were provided.

a.

An accessible question not well answered. A few candidates got the first mark for the definition but were unable to reason why the plane was a success and the result of its success.

b.

A reasonable understanding of dominant designs but some confused omnipresence with ubiquitous.

c.

Generally the best answered of the three 9 mark questions. Most candidates achieved the highest marks in the exploded isometric cluster (2-3 marks) but only 1 or 2 marks in the perspective and orthographic clusters.

d.

Syllabus sections

Topic 4: Final production » 4.1 Properties of materials
Topic 4: Final production » 4.2a Metals and metallic alloys
Topic 4: Final production

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