The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . aiate pointy (fig/ 35)- Of device^ for this purpose there;are many designs; some are fi^ced ot bolted to the are^shifted when nqceg^arv to new, positions, and others are bolted to-?he carnage oT the ^sirae-reVt and move along with it—travelling 2-6 TOOL sicadus. In some the work is steadied in a vee, or a rigtit angle,tn others adjustable pins or arms are brought into contact with the pressure of the cut would cause an upward as well as back-ward yielding of the work, these two movem
The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . aiate pointy (fig/ 35)- Of device^ for this purpose there;are many designs; some are fi^ced ot bolted to the are^shifted when nqceg^arv to new, positions, and others are bolted to-?he carnage oT the ^sirae-reVt and move along with it—travelling 2-6 TOOL sicadus. In some the work is steadied in a vee, or a rigtit angle,tn others adjustable pins or arms are brought into contact with the pressure of the cut would cause an upward as well as back-ward yielding of the work, these two movements are invariablyprovided against, no matter in what ways the details of the steadiesare worked out. Before a steady can be used, a light cut has tobe taken in the locality where the steady has to take its bearing,to render the work true in that place. The travelling steadyfollows immediately behind the tool, coming ia contact thereforeWith finished work continually. Mandrels.—Some kinds of work are carried between centresindirectly, upon mandrels or arbors (fig. 36). This is the method. .-> pic. 36.—Mandrels. A, Plain mandrel. B, Stepped mandrel. C, Expanding mandrel,adopted when wheels, pulleys, bushes and similar articles are boredfirst and turned afterwards, being chucked by the bore hole, whichfits on a mandrel. The latter is then driven between point centresand the bore fits the mandrel sufiBciently tightly to resist the stressof turning. The large number of bores possible involves stockinga considerable number of mandrels of different diameters. As itIS not usual to turn a mandrel as often as a piece of work requireschucking, economy is studied by the use of stepped mandrels, whichcomprise several diameters, say from three to a dozen. A betterdevice is the expanding mandrel, of which there are several essential principle in all is the capacity for slight adjustmentsin diameter, amounting to from J in. to i in., by the utilizationof a long taper. A s
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectencyclo, bookyear1910
