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SHEET METAL DRAFTING
Illustrative Examples
1000 bread pans 4"×8"×2" deep with ½" flare on all sides are to be made. The size of the body pattern is 7½" by 8½". The size of the end pattern is: top 4½", bottom 3½", depth 2½".
Example of Problem 4A.
Fig. 37.
Ans. (a) 36 blanks for body.
(b) 38 blanks for ends.
Example of Problem 4C.
| 1 piece 1½"×25½" = | 38.25 | sq. in. | |
| 1 piece 4½"×1"= | 4.50 | sq. in. | |
| Total | 42.75 | sq. in. | Ans. 42.75 sq. in., waste from bodies. |
Example of Problem 4D.
| length | 8.5" | ||
| × | Total waste 42.75÷36=1.18 sq. | ||
| width | 7.875" | in., waste per blank. | |
| 66.93 | sq. in., area of body |
| (Area) 66.93 | 1.11800 | (waste) | .017 | |
| 6693 | ||||
| 51070 | ||||
| 46851 | ||||
| Ans. | 1.7% | , waste per body blank. |
