Engineering - Exam Papers - HL - Project - 2013

150 Marks

Design Brief

1. Introduction
   
   Electromechanical games of skill and chance, such as the crane vending machine, date back to the early 20^th century. One design of this machine, popular in amusement parks and arcades, presents a unique opportunity where the payload of the game is lifted and dropped. The challenges of the crane vending machine are to judge precisely the distances which the crane will move to collect a payload, to then lift the payload and finally deposit it through a selected hatch.
   
   Design a model of a crane vending machine to the general specifications outlined below using a table tennis ball as the payload.
   
   The model should :
   
   
   1. Have a lifting mechanism capable of picking up a table tennis ball from a designated area, using a lift, grab or suction technique;
   
   
   2. Incorporate a switching panel to operate the various movements of the crane;
   
   
   3. Include a novel receiving platform for the released table tennis ball with a number of hatches of various scoring results.
   
   
   Presentation of the completed model should ensure that :
   
   
   1. All main operating features are clearly visible without dismantling.
   
   
   2. The longest dimension of the model does not exceed 350 mm.
   
   
   3. Electric power does not exceed 9 volts.
   
   
   
2. Design Process (40 marks)
   
   A design folio must be compiled which will detail your :
   
   
   1. Analysis of the given brief and investigation of possible solutions;
   
   
   2. Criteria for selection of your own individual solution and production drawings/plans;
   
   
   3. Testing and evaluation of your design solution;
   
   
   4. Special instructions, if required, regarding the testing of the solution by the examiner.
   
   
   Note: Marks are awarded as shown in Marking Scheme (below).
   Computer-aided design (CAD) should be used where possible.
    
3. Design Realisation (110 marks)
   
   Using appropriate materials, make the model according to your own individual design plans. Computer numerical control (CNC) technology should be used, where possible, to support manufacture. You are required to manufacture and assemble all the parts, subject to the following guidelines :
   
   
   1. Standard components may be used to support the assembly and interconnection of various parts;
   
   
   2. Unnecessary recycling will result in lost marks. Recycling will be acceptable only in cases where a complex part cannot readily be made in the school;
   
   
   3. Bought-in electronic solutions will result in lost marks;
   
   
   4. Adhesives, if used, should be applied sparingly.
   
   
   Marks are awarded as shown in Marking Scheme (below).
   
    
4. Project Presentation
   
   Your completed project consisting of the model and design folio, both clearly identified with your examination number, must be available to the visiting examiner.
   
   Marks are awarded for quality of presentation and finished appearance of both the model and folio.

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Marking Scheme