File:Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics (1892) (14770205515).jpg

Identifier: modernmechanisme00benj (find matches)
Title: Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics
Year: 1892 (1890s)
Authors: Benjamin, Park, 1849-1922
Subjects: Mechanical engineering
Publisher: New York, D. Appleton
Contributing Library: Mugar Memorial Library, Boston University
Digitizing Sponsor: Boston University

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the H. B. Smith Machine Co. Ithas two horizontal cutter shaft^, lying parallel in the same vertical plane, and the upper oneborne by a carriage having a vertical adjustment on a vertical column, to suit the varyingwidths of sashes. The stock slides between parallel ways, one above and the other below,the upper one having the same vertical adjustiment for sash width that the upper cutter has.Both the top and the under cutter-heads are so constructed and placed as to give an evendraw cut on the work, and are furnished with chit) breakers and shavings bonnets. It may be sidd in connection with outside bearings for horizontal mandrels, such as areused on molding machines, that if the machine is properly designed and constructed they MOLDING MACHINES. 529 will be entirely unnecessary, and they are certainly very inconvenient, being in the way inchanging cutter-heads, while those that are furnished are seldom strong enough or rigidlyenough attached to be of real service, as they should be.
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Shapers and Friezeks, more than most other wood-working machines, should be sowell designed and constructed that they will do accurate and perfect work, all pieces thatthey produce being curved and molded, and their sharpness and accuracy would be lessened 34 530 MOLDING MACHINES. by the use of sandpapering machinery, however carefully handled. If, then, it is desired tomake work that has no roughness of surface, freedom from undue jar and vibration mustbe obtained by giving the machine strength and solidity throughout, as well as careful work-manship and fitting. As the higher the speed the cleaner tlie work, it is essential that thebearin^s be long enough and good enough to stand high speed for a long time, underheavy pressure without heating or wear. It is best that tlie mandrels of shatjers should bearran-ed to run right or left to best suit the grain of the material, and that the change fromone dfrection of rotation to the other should be made promptly ard by the foot, in order t

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