Conditions Of Procedure

Whenever the building of a pattern is consigned to the pattern maker, a detailed sketch or drawing of the completed casting should be furnished; also information regarding the number of castings that are required. It may be a repair part, or experimental work, and only one casting required, and, if so, it would often be economy to make the pattern as cheaply as possible, even if the expense of molding is slightly increased. Or it may be for a standard casting, for which it is expected to use the pattern for years, and in this case special study should be given the manner of construction, to prevent the distortion and general breakdown of the pattern, due to its shrinking, warping, and abuse.