Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors .. . Figure 302A universal flanging press. operation. Much of the hand work usually done on ac-count of not having complete dies, can be done on thisuniversal machine. The sheet is held the same as the one 306 Electrically operated punching machine. just mentioned and one section after another is flanged bythe pistons B and «-E CiM** L//;- Figure 303An electrically operated punching machine. A punching- machine will be seen in Fig. 303. In-stead of a counter weight, a spring S is used to coun
Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors .. . Figure 302A universal flanging press. operation. Much of the hand work usually done on ac-count of not having complete dies, can be done on thisuniversal machine. The sheet is held the same as the one 306 Electrically operated punching machine. just mentioned and one section after another is flanged bythe pistons B and «-E CiM** L//;- Figure 303An electrically operated punching machine. A punching- machine will be seen in Fig. 303. In-stead of a counter weight, a spring S is used to counter- 307 An hydraulic punch. balance the head. This spring should be adjusted so thatthe head is always over counterbalanced, so that when thepunch hits the sheet, no lost motion will have to be taken cm B J pjP11™ Kyi:4 W/Uk Ficrure 304 An hydraulic punch. up. H is the handle by which the punch is operated. Thepunches are usually run at a speed ranging from 15 to 25 308 A punch for wide sheets. ^^^^H s^ > Sb r% i ^^^ v •St ^ o * 30Q Operation of punch for wide sheets. strokes per minute. Where the punch is used for cutting,the speed can easily run up to 25 or 30 strokes perminute. But where single holes have to be punched andthe centers of the holes must be felt for, 20 strokes perminute is about right. The head of this punch is forced upand down
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Keywords: ., bookcentury1900, bookdecade1910, bookidlocomotivebo, bookyear1912
