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SHEET METAL DRAFTING
Item 5. Cost of Rivets.
| Total number of 2½ | lb. rivets required | (500× | 52) | = | 26,000 |
| Total number of 6 | lb. rivets required | (500× | 4) | = | 2,000 |
| Total number of 8 | lb. rivets required | (500× | 4) | = | 2,000 |
| Total number of 1½ | lb. rivets required | (500× | 16) | = | 8,000 |
Flat Head Tinner's Rivets are sized by their weight per thousand; i.e. 1000 rivets of 2½lb. weigh 2½lb.
| Weight of | 26000-2½ | lb. rivets | ( | 26 | × | 2½ | ) | = | 65 lb. |
| Weight of | 2000-6 | lb. rivets | ( | 2 | × | 6 | ) | = | 12 lb. |
| Weight of | 2000-8 | lb. rivets | ( | 2 | × | 8 | ) | = | 16 lb. |
| Weight of | 8000-1½ | lb. rivets | ( | 8 | × | 1½ | ) | = | 12 lb. |
| Total weight of all rivets | = | 105 lb. | |||||||
| Total cost of rivets at 40¢, average price per lb.=$42 | |||||||||
Item 6. Drop Handles.
Total number of handles required, 500×2=1000
Weight of 36 handles and lugs, 15.66 lb.
Weight of 1000 handles (1000÷36)×15.66=444.18lb.
Cost of 1000 handles at 30¢ per pound=$133.25
Summary of Costs.
| Item 1 | $491.30 |
| Item 2 | 236.47 |
| Item 3 | 192.59 |
| Item 4 | 658.65 |
| Item 5 | 42.00 |
| Item 6 | 133.25 |
| Total cost | $1754.26 |
| Cost per barrel | $3.51 |
