Each problem must be done using Word. For each problem, the quiz solution must identify:
(1) steps,
(2) words to explain variables, and
(3) formula when needed,
(4) text page number if needed,
(5) figure to show the design done as summary,
(6) the summary of design written out as Word and Excel spreadsheet at end.
V-Belt Drives
1. Specify the standard 3V belt length (from Table 7-2) that would he applied to two sheaves with pitch diameters of 5.25 in and 13.95 in with a center distance of no more than 24.0 in.
2. For the standard belt specified in Problem 1, compute the ac-tual center distance that would result.
3. For the standard belt specified in Problem 1, compute the angle of wrap on both of the sheaves.
4. Specify the standard SV belt length (from Table 7-2) that would be applied to two sheaves with pitch diameters of 8.4 in and 27.7 in with a center distance of no more than 60.0 in.
5. For the standard belt specified in Problem 4, compute the ac-tual center distance that would result.
6. For the standard belt specified in Problem 4, compute the angle of wrap on both of the sheaves.
7. Specify the standard 8V belt length (from Table 7-2) that would be applied to two sheaves with pitch diameters of 13.8 in and 94.8 in with a center distance of no more than 144 in.
8. For the standard belt specified in Problem 7, compute the actual center distance that would result.
9. For the standard belt specified in Problem 7, compute the angle of wrap on both of the sheaves.
10. If the small sheave of Problem 1 is rotating at 1750 rpm, com-pute the linear speed of the belt.
11. If the small sheave of Problem 4 is rotating at 1160 rpm, com-pute the linear speed of the belt.
12. If the small sheave of Problem 7 is rotating at 870 rpm, com-pute the linear speed of the belt.
13. For the belt drive from Problems 1 and 10, compute the rated power, considering corrections for speed ratio, belt length, and angle of wrap.
14. For the belt drive from Problems 4 and 11, compute the rated power, considering corrections for speed ratio, belt length, and angle of wrap.
15. For the belt drive from Problems 7 and 12, compute the rated power, considering corrections for speed ratio, belt length, and angle of wrap.
16. Describe a standard I 5N belt cross section. To what size belt (inches) would it be closest?
17. Describe a standard 17A belt cross section. To what size belt (inches) would it be closest?
For Problems 18-22 (Table 7-12), design a V-belt drive. Specify the belt size, the sheave sizes, the number of belts, the actual output speed, and the center distance.
Roller Chain
23. Describe a standard roller chain, no. 140.
24. Describe a standard roller chain, no. 60.
25. Specify a suitable standard chain to exert a static pulling force of 1250 lb.
26. Roller chain is used in a hydraulic forklift truck to elevate the forks. If two strands support the load equally, which size would you specify for a design load of 5000 lb?
27. List three typical failure modes of roller chain.
28. Determine the power rating of a no. 60 chain, single-strand, operating on a 20-tooth sprocket at 750 rpm. Describe the preferred method of lubrication. The chain connects a hy-draulic drive with a meat grinder.
29. For the data of Problem 28, what would be the rating for three strands?
30. Determine the power rating of a no. 40 chain, single-strand, operating on a 12-tooth sprocket at 860 rpm. Describe the preferred method of lubrication. The small sprocket is ap-plied to the shaft of an electric motor. The output is to a coal conveyor.
31. For the data of Problem 30, what would be the rating for four strands?
32. Determine the power rating of a no. 80 chain, single-strand, operating on a 32-tooth sprocket at 1160 rpm. Describe the preferred method of lubrication. The input is an internal com-bustion engine, and the output is to a fluid agitator.
33. For the data of Problem 32, what would be the rating for two strands?
34. Specify the required length of no. 60 chain to mount on sprockets having 15 and 50 teeth with a center distance of no more than 36 in.
35. For the chain specified in Problem 34, compute the actual cen-ter distance.
36. Specify the required length of no. 40 chain to mount on sprockets having 11 and 45 teeth with a center distance of no more than 24 in.