Wood conversion by machinery Author:John Richards Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: several stories, without impeding the movement of material, or causing obstruction to belts or machinery. In such an arrangement, the weight falls vertically upo... more »n the walls of a building, and distributes the whole load more equally than if, as is too often the case, three-fourths rested on a row of central columns. CHAPTER V. FOUNDATIONS FOB, HKCIPROCATING MACHINES. Earth foundations are generally thought of as the only permanent and reliable support, for machines which cause jar and vibration; yet a proper attention to the conditions of setting and arranging, will enable almost any rotary machine, and many reciprocating machines, to be operated on upper floors with safety and satisfaction. There are pertaining to the fixing and supporting of machines, principles which are not only obscure, but have received apparently no attention at the hands of those who have written instructions and rules for erecting and operating machinery, and as the matter is one of special importance in wood manufacture, and has to do with buildings as well, some consideration of the subject will not be out of place here. The subject divides itself into two branches; one pertains to machines with reciprocating motion, and the other to machines with rotary motion only. In respect to reciprocating machines, such as frame saws, jig saws, mortising machines, and so on, earth foundations resist vibration mainly by the inertia of their weight; that is, an iron machine frame, when firmly bolted to a mass of masonry, becomes part of a whole, consisting of the foundations and the superstructure. A machine frame of one ton weight, bolted to five tons of mason work is in effect much the same as though the same machine frame contained six, instead of one ton of iron. It is, therefore, not the earth ...« less