The vertical turret lathe is less frequently supplied with multiple tools than the horizontal type of machine, for the reason that the regular equipment supplied by the manufacturers is adapted to a wide range of conditions without very much special tooling, and, in addition, the class of work for which this machine is more likely to be used is of such a nature that multiple turning tools are less likely to be required. There are instances, however, when a considerable increase in production may be made by the use of the multiple type of tools. Take for example the special gear shown at A in Fig. 11. This piece of work is held by the inside of the rim in special jaws, and the tools in the side-head turret are used to face and turn the gear portion while the special multiple tools are at work on the hub. Before the operation illustrated takes place, the work has been bored, reamed and faced on the other side.

Fig. 11. Multiple Turning Tool for Vertical Turret Lathe.

The body of the tool H is of cast iron and it is fastened to the turret face by the screws J, while the plug K centers it in the turret hole. The turning tools E and F are secured in the slots and a steel cover-plate G gives support for the set-screws which hold the tools in place. A steel shank B has a revolving roll G fastened to its lower end by the shouldered screw D; this roll acts as a pilot in the finished hole.

The construction of this device is simple and the results obtained by its use are excellent.