Question

9. The component has been produced according to the specifications shown in Figure (a). Then each part has been measured as illustrated in the Table. Which part would be acceptable or rejected? State your reasons. Show your calculations. Change the design specifications to Figure (b), which part would be acceptable or rejected? State your reasons. Show your calculations Part Feature Size 00 $0.08 MAX 30.04 29.85 29.84 29.81 29.82 Straightness Deviation 0.005 0.05 0.11 0.09 30.00 29.84 0.05 30.00 29.84

Answer 1

MMC = 0 30.00 MM B = 30.00+ 0 0 = 0 30.00 Since there is a maximum material remaing tolerance will be available modifier M as bonus the tolerance + + t + + & Straightness = 6 o 0 0.0 0 0.02 $ 0.03 6.04 + + + + + + Size of shaft $ 30.00 629.99 $29.98 Ø 29.97 Ø 29.96 € 29.95 Ø 29.94 $29.93 $ 29.92 * 29.91 Ø 29.90 $29.89 € 29.88 $29.87 Ø 29.86 Ø 29.85 - 6 29.84 MMB $30.00 € 30.00 $30.00 $30.00 $ 30.00 $30.00 & 30.00 $ 30.00 Ø 3000 $ 30.00 $30.00 $30.00 $30.00 Ø 30.00 $30.00 $30.00 830.00 + + + 0.05 Ø 0.06 € 0.07 € 0.08 0.09 Ø 0.10 Ø 0.11 Ø 0.12 Ø 0.13 € 0.14 0.15 0 0.16 + + ta ta ta ta ta tl+ = = =_ = c I t t + Parts A, D & E are rejected since the Feature size Ivalues are beyond the limits of $29.84- 630.00 l you can see the available tolerance for straightness in the table for parts B & c The tolerance for B (60.05 & 600 11) are less than the available tolerance hence the parts may be [accepted. But since straightness tolerance is limited to 160.08 part c is also rejected fence only part. B. will be accepted