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'Shipping. of the Emergency Fleet corporation and in the United States navy. rine castings August, 1919 by Lloyds and the American Bureau of Many are in use on ships Floor Type Boring Mill Machining operations on heavy ma- present many difficult problems that can be solved suc- cessfully only through the use of properly designed dnd adequate ma- chine tool equipment. This is especially true in cases where the machining in- volves several operations such as drilling, boring, milling, tapping or rotary plan- ing. Attention has thus been directed to the design of a machine tool which would be equipped to handle these sevy- eral operations and save a large amount CAST STEEL ANCHOR WEIGHING 10,315 POUNDS of time otherwise spent in setting up heavy castings for machining. The machine. shown in the accompany- ing illustration is said to be' capable of handling all the operations generally done with a floor-type boring machine. It is a product of the Landis Tool Co., Waynesboro, Pa. The tool is driven through the medium of a motor which is mounted at the top of the column. The drive is directly connected to the main drive shaft which entirely eliminates the use of belting. The spindle drive is controlled by two friction cone clutches which are located at the back of the saddle where they are readily accessible for adjustment. This arrangement provides a_ reversal for the spindle during back facing and tapping. It is said that the location of the spindle drive eliminates torsion. and consequent chattering during heavy cuts. The spindle is high-carbon hammered steel, finished by grinding. The front end of the spindle slides through an ad- Justable bearing which is carried in the spindle sleeve. However, the spindle does not rotate in this bearing. The ro- tating motion is taken care of in an- other adjustable bearing on the external diameter of the spindle sleeve. It is Pointed out that this design permits tak- simultaneously. THE MARINE REViEw ing up for wear on the sliding spindle bearing, The spindle is traversed by a long bronze nut which engages a _ square thread on the spindle. This nut has a bearing on the sides of the thread only. This arrangement provides a long bear- ing and as the nut and the spindle ro- tate together, except when the feed is engaged, wear is reduced to a minimum, End thrust in both directions is taken up by ball thrust bearings. The spindle is driven radially through the medium of a screw feed actuated by a differential train of gears. The thrust of the spindle, when milling, is taken up by the main saddle casting and is independent of the thrust of spindle for boring. Twelve changes of speed and Foal are provided. All feeds are,of the same rate, per revolution of the® Spindle, whether applied to the spindle, saddle or column traverse. No two feeds can be. engaged Any one 'of the: 12 feeds can be applied to the 12 speeds which gives in reality 144 rates of feed. A rapid power traverse is provided which is independent: of the regular feeds. This actuates the spindle, saddle and column in all directions. - The fact that no two feeds can be engaged at the same time helps to make the machine fool proof while the large variety of feeds provided adapt the tool to numerous machining operations. It is pointed out that the rapid power traverse expedites production. Gear shifts are of the sliding-gear type and are enclosed to run in oil. All traversing gears are located between the ways and close to the guiding side. Gears and shafts are chrome nickel steel. Oiling of the saddle parts is accom- 403 _ TURRET-HEAD TOOL WITH FOUR STATIONS plished through. the medium of a syphon system which is said to insure an ade- quate supply of clean oil at all times. TurigiHead Tool The device shown in the accom- panying illustration is a 4-station re- volving turret head designed by the Production Tool Mfg. Co., Stillwater, Minn., to be attached to the clapper box. of a planer or shaper, Jt as pointed out that this.device gives the machine in question the same ad- vantage as a turret lathe equipped with a multiple tool holding device. The tool has -a positive indexing mechanism which is readily actuated. While working on parts. requiring a number of tools to complete the machining, it is a simple matter to set them, one after another, in the turret head. It is pointed out that SELF-CONTAINED, MOTOR DRIVEN BORING MILL ADAPTED TO MARINE CONSTRUCTION