Page:Sheet Metal Drafting.djvu/38

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24
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"= 04.50 sq. in.
Total 42.75 sq. in. Ans. 42.75 sq. in., waste from bodies.

Example of Problem 4D.


length 08.5"
× Total waste 42.75÷36=1.18 sq.
width 07.875" in., waste per blank.
66.93 sq. in., area of body
(Area) 66.93 1.11800 (waste) .017
0.6693
0.51070
0.46851
Ans. 1.7% , waste per body blank.