Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors .. . olesafter having been drilled or punched are required to becountersunk. This is the case with most rivets in thewater space frame, dome flange, dome cap, etc. Someare countersunk to clear casings or frames, while othersare countersunk to give a neat appearance, or, as in thecase of a fire box, to prevent the rivet head from burningoff. A rose reamer, like that shown in Fig. 117, is bestfitted for this work. It gives a much better surface thancan be obtained by a flat drill and the countersin
Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors .. . olesafter having been drilled or punched are required to becountersunk. This is the case with most rivets in thewater space frame, dome flange, dome cap, etc. Someare countersunk to clear casings or frames, while othersare countersunk to give a neat appearance, or, as in thecase of a fire box, to prevent the rivet head from burningoff. A rose reamer, like that shown in Fig. 117, is bestfitted for this work. It gives a much better surface thancan be obtained by a flat drill and the countersink willbe round instead of being full of corners as would bethe case if a flat drill were used. It should be the aim, in the construction of any 148 When hand work is necessary. boiler, to do as much machine work as possible, althougha certain amount of hand work is unavoidable. illustrates a very convenient arrangement for push-ing the drill or reamer into the work. It consists of apiece of boiler plate P with four eyes forged into it, fromwhich chains C, lead all the way around the The Berry Collard Co. Figure ngRatchet drill. These chains are long enough to encircle the largestboiler, and are provided with a clip so that they can betaken up on one end to suit the proper length of 90 degrees movement can be obtained with theratchet handle H, which is plenty large enough for a handmotion. One of these ratchet drills is seen in Fig. 119. Amill screw S at the top feeds the drill into the work. Theratchet handle can be made to operate right and left byturning the thumb screw T one way or the other. Anair drill is much more rapid than any hand drill andwherever these drills can be used to save time theyshould be employed. The same arrangement that isshown in Fig. 118 applies equally as well to air or otherstyle of drill. Most wash-out plugs, blow-off cocks, injector-feed 149 Cutting holes for connections. connections, etc., are made by brass flanges. As
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