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Case Study: Wheel Caster Attachment

Design Brief The objective of this case study is to design a modular desk chair. Part of the design exercise is to evaluate the module interface design concepts which provide a location for the attachment of the chair base with the wheel caster. All the specifications of the concepts fulfil the design constraints.

University of Malta

Department of Industrial and Manufacturing Engineering


Case Study D - Wheel Caster Attachment 24 November 2012 08:48

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Catalogue

University of Malta

Department of Industrial and Manufacturing Engineering


Name: Wheel Caster A Description: Threaded wheel caster

Number of parts: 1 Approximate cost (Euros) of stem: 2.80 Comments: The caster stem is threaded

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Shear Strength (MPa) : 32

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Name: Wheel Caster B Description: Wheel caster with 4 attachment points

Number of parts: 5 Approximate cost (Euros) of stem: 4.16 Comments:

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Shear Strength (MPa) : 18

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Name: Wheel Caster C Description: Wheel caster with 3 attachment points

Number of parts: 4 Approximate cost (Euros) of stem: 6.92 Comments:

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Shear Strength (MPa) : 26 Approximate cost (Euros) of stem: 4.16

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Name: Wheel Caster D Description: Bolted wheel caster

Number of parts: 3 Approximate cost (Euros) of stem: 2.15 Comments:

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Shear Strength (MPa) : 11

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Name: Wheel Caster E Description: Bolted wheel caster

Number of parts: 1 Approximate cost (Euros) of stem: 1.52 Comments:

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Shear Strength (MPa) : 5

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Name: Wheel Caster F Description: Bolted wheel caster

Number of parts: 1 Approximate cost (Euros) of stem: 0.96 Comments:

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Shear Strength (MPa) : 11

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Meeting Notes

University of Malta

Department of Industrial and Manufacturing Engineering


Wheel Caster A 21 November 2012 19:21

Threaded surface - easy to fabricate May be challenging to assemble, especially if the assembly is to be carried out by the user

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Wheel Caster B 21 November 2012 19:25

4 fastening points - assembly and disassembly will not be rapid

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Wheel Caster C 21 November 2012 19:27

The overall caster is significantly complex to manufacture compared to other concepts.

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3 fastening points

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Wheel Caster D 21 November 2012 19:29

Very easy to assemble - 1 bolt and nut.

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Wheel Caster E 21 November 2012 19:30

Fabrication is quite straight forward

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Snap in stem‌very easy to assemble but difficult to disassemble

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Wheel Caster F 21 November 2012 19:32

Bolts are fastened from these points Easy to fabricate, assemble and disassemble

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People

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Department of Industrial and Manufacturing Engineering 17


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Wheel Caster