The work shown at A in Fig. 5 is a cast-iron pot from which concentric packing rings are to be cut, and the boring and turning are done at the same time. Two cast-iron holders N are tongued at 0 and secured to opposite sides of the turret by the screws P. The turning- and boring-bars B and C pass through the holders and extend entirely across the turret. The boring-bar C is of the same diameter along its entire length, and it is secured in the holders by shoe binders similar to that shown at H but located in the sides of the holders. The boring tools E are of rectangular section and secured by set-screws in the slots at the ends of the bar. The screws F and G help to stiffen the ends of the bars where they are slotted. The upper or turning-bar is made in two sections K and M so that the tools may be swung radially to bring them into their proper position when the turret is set off center for turning larger diameters. The end of one bar is turned down at L to fit the.hole in the other bar and the screws ,Q make a firm joint. A set of bars and holders of this kind is a very useful adjunct to a turret lathe equipment, and it may be adapted to a variety of uses. The double tie feature across the turret gives exceptional rigidity.

Fig. 5. Boring-bars for turning Concentric Packing Rings.