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(IELM317)ex1.pdf
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IEEM 317 Product Design and Development Name
Fall 2004, Exam I
Max Time 2 Hours, Max Score: 50 SID


Question 1. Conceptual Design, Design evaluation [6+2+2]

(i) Given below is the sketch of a typical chair used in many classrooms in HKUST. Due to the position of the writing pad, different chairs must be used by right-handed or left-handed users.

Two alternate designs are proposed in which the same chair can be used by either right- or left-handed users. Compare the two new designs against the HKUST design using Pughs method.
For each rating you give, give a reason (1-2 lines max).

(ii) Based on your answers, which is the best design?

(iii) Write one point each for SWOT analysis of the better design among the two new ones.








Pad rotates open to allow user to sit
Both pads can be opened to sit
Arm rotates to allow user to sit
Pad can slide to left or right

Ease of sitting/getting up



Manufacturing cost



Convenience of use



Ability to Stack-up chairs






Question 2. Product Family Design [4+4]
(a) Recall that Taguchi used his quality loss function, L = K(y C m)2, to determine the size ranges that should be offered. The optimal spacing between consecutive sizes of product is such that the cost per product for the manufacturer is equal to the average loss of quality to the society.
Assume that a manufacturer uses this method to determine three consecutive size steps for a product, and these sizes are given by: s1, s2, and s3.

State TRUE or FALSE, giving your reason:

The step sizes suggested by Taguchis method will be equal, namely, s2 C s1 = s3 C s2.



















(b) Pahl and Beitzs suggestion is that consecutive step sizes should be geometrically spaced, namely, s3/s2 = s2/s1. Can this guideline be consistent with Taguchis guideline? If not, why not? If Yes, under what conditions?
Question 3. Engineering Drawings and Projections [(4+4)+4]
(a)
(i) The figure below shows a symmetric mechanical part (a pivot-block); draw the following three orthographic views: TOP, FRONT and RIGHT side.



(ii) Using the orthographic views, make a projection view that shows the face marked F in true size. This view must show all faces that are visible in the TOP view of the part.


(b) Consider a perspective image of an object where (i) the object is completely behind (and not touching) the picture plane, and (ii) the station point (viewing point) is at a finite distance from the picture plane (see image below). Is it possible for any face of the object to appear in true size? If yes, show an example; if not, prove your answer.





Question 4. Dimensioning and Tolerancing [(2+4+2)+(2+2)]
(a) The following figure shows an engineering drawing for a simple part.




(i) Among the dimensions on the drawing, identify and mark one exampl