Question

Question 2 Explain four rules that could be used to design a product for assembly and discuss how they will provide benefit, use sketches to illustrate your answer.. [8 marks] Table Q2 itemises the precedence and timing information that is required to complete the assembly of a product. Through the application of a Largest Candidate Rule procedure, devise an assembly task grouping to achieve an assembly rate of 30 per hour. What is the utilisation for each assembly station [8 marks If the assembly rate is increased to 60 per hour, discuss the implications for station task assignment in terms of the theoretical minimum number of stations required [4 marks Task Precedence Duration (s) 1 30 2 20 1 3 10 4 20 5 4 40 6 50 6 40 8 2,5 20 8,7 9 30 Table Q2 Assembly Task List For the assembly rate of 30 per hour, devise an inter station layout to accommodate the assembly rate and justify any assumptions that you make. If transport in the system is to be provided by a conveyor determine the relationship between assembly station position and conveyor speed. [5 Marks

Answer 1

1. Minimize half Count
Look for ways in which to mix components. as an example, several physical science housings use living hinges rather than a knuckle hinge. once routing wires, select wrought guide options, or use a heat-formed guide (like in recent LazerTag guns). And speaking of minimizing half count...

2. integrate Fasteners
Whenever potential, build the assembly options directly into the components, rather than victimisation screws. Snap fits are usually even as secure and need no tools to assemble. typically screws are necessary, however use sparingly—fasteners will consume the maximum amount as fiftieth of assembly labor. One factor to note: Snap fits will increase the price of injection-mold tooling, therefore take care to style the components to be injection-molding friendly.

3. Give components Clear Orientation
Related to the thought of unique connections is exclusive orientation: If there's a right and wrong orientation for components to be assembled, build it obvious that method is correct. Even higher, build it not possible to assemble the components within the wrong method. For spherical components, this might mean simply having a notch, however with additional complicated shapes, this could give a chance for a few inventive style.

4. Design for Real-World Tolerances
Finally, ensure custom elements may be factory-made simply. Tolerances garner, and a minor variation in every operation will add up to an enormous problem—especially if your style isn’t ready to accommodate the variation.

Whenever potential, provide your processes the maximum amount space for error as potential. Yes, the mechanic will create your half acceptable among one-ten-thousandth, however if that’s needed you’ll unnecessarily introduce terribly pricey machining. And with 3D written elements, think about the same: even laser-sintered have variation, and it’s price considering however these tolerances can match along.