. Canadian transportation & distribution management. Die for Depressed Staybolt Holes. April, 1913.] CANADIAN RAILWAY AND MARINE WORLD. 157 The snap on the left is that used forordinary cone headed rivets, which of coursecenitre themselves naturally. In the caseof flat iheaded rivets, trouble is usuallyexperienced with the rivet running over un-less more than usual care is exercised bythe boilermaker. The snap shown in thecentre of the group overcomes this runningover tendency in a very simple manner. Inthe centre of the snap, a % in. hole isdrilled to a depth of about ys in. The first plate,
. Canadian transportation & distribution management. Die for Depressed Staybolt Holes. April, 1913.] CANADIAN RAILWAY AND MARINE WORLD. 157 The snap on the left is that used forordinary cone headed rivets, which of coursecenitre themselves naturally. In the caseof flat iheaded rivets, trouble is usuallyexperienced with the rivet running over un-less more than usual care is exercised bythe boilermaker. The snap shown in thecentre of the group overcomes this runningover tendency in a very simple manner. Inthe centre of the snap, a % in. hole isdrilled to a depth of about ys in. The first plate, there is the usual copper ring, Theaction of the expander is to so expandthe tube in and around the plate openingas to form a solid joint. To finish, the outeredge is beaded over with a beading tool inthe customary manner. The ends of tubesthat have been thinned dawn by repeatedexpandings, to such a degree as are deemedunsafe, are reinforced by means of the sametool, inserting a short piece of smaller tub-ing in the end, after first cutting off the. Fis 5.— Practice in Expanding Tubes. blow of the hammer on the head causes asmall amount of the metal to flow up thishole, forming a small tit that automaticallycentres the snap on the rivet, a good rivetresulting. Hand operated flue expanders, as almostuniversally used, are an ever fruitful causeof trouble. In the first place, they are fartoo slow in action, and the very fact thattheir action is a rotary one makes theiruse rather difficult in cramped places, such inner beading, the reinforcing piece beingbeaded over in its place, all as in fig. 4. The method of safe ending tubes is shownin fig. 7. The practice in this re-spect resembles that of many other safe end is flared, and slipped over theheated end of the tube, neither part beingbevelled, a practice that is used with aconsiderable degree of success in some heating both parts, they are weldedtogether in a rotary swedging machine, pro-
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherdonmi, bookyear1913
