Page:Popular Science Monthly Volume 92.djvu/633

 Popular Sricficc Motithhi

��An Adjustable Radius Turning Tool for Lathes

EVERY mechanic has at some time experienced trouble in making a true radius on a lathe. The tool illustrated, was designed for this special work and

���A revolving turret on the tool which is con- trolled by a worm on the rod with crank

has proven a success, especially for tool room mechanics. The holder is made to receive the small high speed steel cutter in a revolving turret controlled by a worm on a shaft through the arm or tool post end of the holder. The shaft is turned by a small crank on the back end.

With this tool the stock may be roughed out, then turned to the radius for which it is set. The setting of the small tool in the turret determines the radius to be turned. This may be done by measuring from the tool point to the curved surface of the turret. Its diameter having been determined the exact radius may be easily obtained. — H, E. Anderson.

��Protecting the Soles of Shoes with Ordinary Varnish

WITH the ever-increasing cost of foot- wear, it behooves the user to get as much service from his shoes as possible. To do this the leather must be protected. The soles are the first to suffer, but if the uppers are not impervious to water they wull get damp even when the walks are not very wet, and will eventually crack.

Chamber's Journal is responsible for an article describing how to apply an inferior type of cop:.! varnish to the soles to keep out the water.

The leather must be quite dry and bare when the varnish is applied. New bo )ts should therefore be worn for a day before treatment, so as to remove the black var- nish from the soles. The operation is car- ried out by brushing on the varnish at in- tervals of half an hour, until the leather

��617

will not soak up any more. This condi- tion may be recognized from the surface remaining shiny all over, instead of be- coming dull in places. After being hung up to dry for about twelve hours the boots are ready for wear.

A Metal Clip Formed with One Die and One Operation

DUPLICATE parts are quickly made in a punch press by several opera- tions, but how many persons would think that a piece like the one shown in Fig. 1 could be made with one tool in one operation? Such a shaped piece of metal is used as a catch on breast pins, class pins and similar jewelry. The clip is cut and formed from a strip of metal as shown in Fig. 2.

The punch and die for punching and shaping the metal are shown in Fig. 3. The die consists of a piece of steel with a rectangular hole cut in it the width and length necessary to bend the metal in the shape shown. The punch has a

��o

��ng2

��Fig.i

��The shape of the tool forms the clip as it is cut from the metal

���wedge-shaped point A which punctures the metal first, cutting along the line F-G in Fig. 2. Then as the surface A-B, Fig. 3, enters the metal, it cuts along F-I and G-H, Fig. 2. As the punch cuts these edges, the metal rolls into a curve. The part D-E on the punch. Fig. 3, cuts the metal along the lines J- K, K-M and M-L and bends it in the line J-L, Fig. 2, then when the part B-C, Fig. 3, reaches the metal it cuts out the remainder, leaving the holes N-O-P-Q, Fig. 2, in the metal,

�� �