Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors .. . ip 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 sa
Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors .. . ip 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 the holesin the boiler are several inches in diameter, they are cutout under the radial drill by an arrangement shown in The cutter C is square on the outside and at an angleon the inside. It is sharpened by grinding the Cutting large holes on radial drill. The radial arm in this case is lowered so as to supportthe spindle near the bottom. Where these holes aremuch larger in diameter, a hole is drilled in the centerof the circle and a tit on the lower portion of T pro-jects into this hole and guides the cutter. The holes in the water space frame are drilled under 150 Using multiple drills. a multiple spindle drill. These spindles are bunchedtogether, four or six in a group, can be shifted to anyposition within the limits of the machine, and all of themrun through at the same time. A deep pit is provided
Size: 1434px × 1741px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidlocomotivebo, bookyear1912
