DESIGN DATA ON PRODUCTION METHODS 



275 



toward the wide end. The total increase in the radius mil equal the length of the 

 drafted surface in inches, multiplied by the tangent of the nominal draft angle. 



The radii of fillets and corners may be any value not greater than those given in 

 the following table. 



FILLET AND CORNER TOLERANCES 



(Radii in Inches) 



FLAME-CUTTING DATA 

 Scope and Limitations 



Thickness That Can Be Cut. — Any commercial thickness of steel plate and slabs 

 up to about 12 in. thick. 



Contours. — Straight lines, circles, or any irregular shapes, provided inside radii 

 are not less than H in., can be flame cut by machines. 



Width of kerf, or metal removed, varies with thickness of plate as follows: 



Effects of Flame Cutting 



Steel containing less than 0.35 carbon can be cut without taking any special 

 precautions. In general, steels that are satisfactory for fusion welding can be flame 

 cut without causing any difficulties. Higher carbon steel will have a thin layer of 

 hard steel formed on the flame cut surface. Preheating or reheating after flame 

 cutting will prevent or eliminate the hardened surface. 



Identical parts can be produced most economically by stack cutting or multiple 

 cutting. 



Cutting Speed. — Approximate cutting speeds range from 2 ft. per min. for sheets 

 up to }s in. thick, to 21 in. per min. for J 2 in. thickness, 16 in. per min. for 1 in. thick- 

 ness, 12 in. per min. for 2 in. thickness, to 3 in. per min. for 12 in. thickness. 



Tolerances. — Squareness of cut can be held to ^32 in. for plates 6 in. tliickness. 

 This will be affected greatly by size of tip, gas pressure used, and other factors. 



Reference Literature. — For a detailed discussion and data see Chap. 16, "Weld- 

 ing Handbook," 1938, published by the American Welding Society. 



