BOILER MAKERS’ TOOLS AND MACHINERY.
Fig. 156.
[Fig. 156] represents a pair of jack screws. These are invaluable devices for use in boiler-shops, and also in establishments where ponderous machinery has to be shifted or otherwise handled.
But few machine tools are used in making steam boilers, and they are generally as follows:
1st.— The Rolls, operated either by hand levers or power; used for bending the iron or steel plates into circular form.
2d.—A wide power planer for trimming the edges of the sheet perfectly straight and true.
3d.— Heavy Shears for trimming and cutting the plates.
4th.—A Power Punch for making the rivet holes.
5th.—A Disc for making the large holes in the tube sheets to receive the ends of the tubes.
6th.— Rivet heating furnaces and frequently steam riveting machines.
The hand tools needed by boiler makers are equally few, consisting of riveting hammers and hammers for striking the chisels, tongs to handle hot rivets, chipping chisels used in trimming the edges of plates, cape chisels for cutting off iron or making holes in the sheets, expanders to set the tubes, and also drift pins to bring the punched sheet exactly in line.
[Fig. 157] exhibits an improved pattern of the well-known tool—dudgeon expander.
Fig. 157.