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Question 3-Selective Assembly marks] [34 A company intending to produce components for a fit with guaranteed clearance and interference as given in Table Q3 (or S, Smax respectively). It has been experiencing problems when machining both holes and shafts caused by lack of process capability, see the available Manufacturing Methods in Table Q3. Maintaining fit characteristics transform the tolerances to suit the company's capability implementing Selective Assembly method. Table Q3 Third from the last digit of the Manufacturing method Fit requirements, μm Clearance Interference Nominal size, mm System Hole Shaft Smax student number UQXXXXXX Rough 0 026 Drilling (IT13) 70 260 Turning (IT12) Precision 1 015 Reaming (IT8) Hole 37 53 Shaft Turning (IT7) Rough Rough 2 040 Broaching 90 190 Hole (IT10) Turning (IT11) 3 08 Honing (ITS) Grinding (IT6) 3 9 Shaft 4 030 Boring (IT9) Turning (IT8) 30 73 Hole 5 064 Milling (IT9) Turning (IT8) 72 147 Shaft Diamond Precision 6 012 58 72 Hole Boring (IT6) Turning (IT7) Broaching 7 010 Turning (IT9) (IT8) Precision 8 025 Honing (IT8) 35 59 Turning (IT7) Rough 9 020 Drilling (IT11) 17 54 77 Shaft Hole 47 147 Shaft Turning (IT10) 1. Determine tolerances of the mating parts based on the manufacturing methods [4 marks] 2. Select the best (most economical) standard fit to satisfy the clearance/interference requirements and system [10 marks] 3. Calculate the number of groups required for selective assembly [2 marks] 4. Using an appropriate scaling factor, make an annotated tolerance diagram with all required groups and indicate all upper and lower limit deviations [10 marks] 5. Calculate the new (expanded) hole and shaft tolerances and limits [4marks]
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