Sri Lanka Institute of Information Technology
MT1010 Engineering MaterialsMaterial Selection Assignment Title
Case study of materials used in a typical kitchen hand mixer.
Electric hand mixers can be found in any modern kitchen performing tasks such as mixing, blending, whip-
ping, and beating. A typical hand mixer has a handle attached to an enclosure housing a motor which
drives a pair of removable beaters via a gearbox. To perform the beating or mixing action, the beaters are
immersed in the ingredients held in a suitable container. There is a wide variety of hand mixers on the
market with varying speeds, power outputs and designs. In addition to the standard beaters it is usual for
the mixers to be shipped with whisk and dough attachments. While the mixers should withstand enough
torque enforced by the mixing medium, they should also satisfy customer demands for aesthetic appeal, low
power consumption and years of reliable service. Figure 1: A typical kitchen hand mixer.
This is a group assignment. Maximum number of students per group is 5.
In this assignment, each student is expected to write a 15{20 page report on the material used for 3 key
components of a hand mixer. You may want to acquire an old electric hand mixer and dismantle it for a

closer inspection. It is important that
you follow appropriate safety measures such as disconnecting
the unit from electric mains before dismantling.
For each component selected, your team should address the following topics:
1. The background information about the component, for example, the function of the component in the hand mixer and a brief of its historical development if appropriate
2. Any materials related problems with the components you selected
3. Important mechanical or physical properties of the materials to perform the expected function
4. Suggest suitable candidate materials for the component (you should be specic, rather than identifying materials as just `metals’ or `plastic’)
and any other areas relevant. You should consider including actual pictures of the components, and use
diagrams and tables to support your discussion. You can use books, journals, catalogs and Internet for your
research as appropriate. However, it is always important to indicate the source of your information as a
Format Page size: A4
Font Size: 12
Line spacing: 1.5
Referencing is a very important part in your report. Add a list of references at the end of your report.
You will need to submit the electronic copy of the assignment on or before Friday 21st September at 4:00 p.m.
The report should include a title page, full names and Student IDs of each team member, a table of contents
page, and a list of references.
Any type of plagiarism is not allowed. Academic honesty is crucial to a students credibility and self-esteem,
and ultimately re
ects the values and morals of SLIIT as a whole. As this task requires, a student is
expected to work together with other group members discussing the assignment content, identifying relevant
references, and debating issues appropriate to the assignment. Plagiarism occurs when the work of another
person, or persons, is used and presented as ones own. If you are found to have plagiarized your work you
will receive zero marks for the submission.
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