Page:Sheet Metal Drafting.djvu/132

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118
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 × ) = 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 × ) = 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