. Railway mechanical engineer . high degree of workmanship,assuring parallelism and accuracy of leads in all threads cut. All parts of the die heads are hardened, thus providingincreased strength and greater wearing qualities. The headsare easily adjusted to accurate dimensions and each size will cut threads of various diameters and pitches with a changeof chasers. The style A H &: G die head is made in ninesizes for cutting threads up to 3 in. in diameter and the styleC is made in six sizes for cutting threads up to the same CC is a special model made for Cleveland automaticscrew m
. Railway mechanical engineer . high degree of workmanship,assuring parallelism and accuracy of leads in all threads cut. All parts of the die heads are hardened, thus providingincreased strength and greater wearing qualities. The headsare easily adjusted to accurate dimensions and each size will cut threads of various diameters and pitches with a changeof chasers. The style A H &: G die head is made in ninesizes for cutting threads up to 3 in. in diameter and the styleC is made in six sizes for cutting threads up to the same CC is a special model made for Cleveland automaticscrew machines and can be furnished in three sizes, havinga maximum capacity of l*/ in. Referring to the phantom view, the chasers are operatedby cams having a positive bearing directly over the cuttingedge. There are no springs used in closing the head. Thecams are solidly supported by the body and the entire con-struction is characterized by simplicity. The chasers arehobbed, causing the threads to run true to leads and microm-. Fig. 2—Style C Die Head for Use on Turret Lathes, Hand ScrewMachines, Etc. eter measurements. The chasers are made from speciallyselected high speed tool steel hardened to assure toughness,durability and long life. The chasers are interchangeableand may be used in any H & G die head of the same size,irrespective of style or date of manufacture. This featureallows a large number of sets to be carried in stock ready forprompt shipment. 200 RAILWAY MECHANICAL ENGINEER Vol. 95, No. 3 Self-Contained Internal Grinder THE Heald Machine Company, Worcester, Mass., hasdeveloped recently a new cylinder grinder known asstyle No. 55, for the re-grinding of cylinders and otherinternal grinding repair work. This machine differs from C! HBIfl , I A Heald No. 55 Internal Grinder the Heald style 60 machine commonly used in railroad re-pair shops by the elimination of certain speed boxes andother expensive units. These are replaced by a drive from a single shaft on the r
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
