. Railway mechanical engineer . e advantages of the spiral flute with its free andclean cutting characteristics are obvious. All reamers are equipped with lock nuts to hold the sizeand safety stops which prevent over-expansion and indicatepositively when the maximum limits have been sizes of spiral fluted expansion hand reamers areshown in the illustration, including yi-in., 1-in. and reamers are made in all the regular sizes. The spiral flutes afford a distinct advantage in reamingholes having keyways in them. The straight flutes catch and bind on the edges, but the
. Railway mechanical engineer . e advantages of the spiral flute with its free andclean cutting characteristics are obvious. All reamers are equipped with lock nuts to hold the sizeand safety stops which prevent over-expansion and indicatepositively when the maximum limits have been sizes of spiral fluted expansion hand reamers areshown in the illustration, including yi-in., 1-in. and reamers are made in all the regular sizes. The spiral flutes afford a distinct advantage in reamingholes having keyways in them. The straight flutes catch and bind on the edges, but the spiral continuous shearing cutrides safely over the comers assuring a hole cut to size. — -js^nm^ II. II I— ■ Pratt & Whitney Spiral Fluted Expansion Hand Reamers Portable Toggle-Type Pneumatic Riveter FOR portable service, pneumatic toggle-type compressionriveters have been found well adapted, while hydraulicriveters are generally used in stationary work wheremachines of deep reach are needed. The following explana-. Southwark Portable Pneumatic Riveter tion is given of the action of the toggle arrangements onpneumatic compression yoke riveters built by the SouthwarkFoundry & Machine Company, Philadelphia, Pa., whichespecially adapts them to portable service. Riveters aremade by this company in sizes from IS tons up to thosedeveloping ISO tons on the die and having a reach of 23 ft. The toggle mechanism is designed to act rapidly until thedie reaches the point of the rivet wheti it gradually decreasesin speed and at the same time increases the pressure exertedon the rivet. The die travel is practically uniform towardthe last of the operation and thus ensures driving tight rivets,drawing the plates together and following up the shrinkageof the rivet with full pressure until it is set. The die shouldbe adjusted for any run of work so that the rivet is headedwhen the piston has moved through three-quarters of itsstroke. This allows a sufficient travel of the die at fullpre
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
