814 



THE INDIA RUBBER WORLD 



[Seitember 1. 1920. 



THE LAFAYETTE PRECISION TOOL GRINDER. 



While one of its most obvious applications is on a tool-room 

 lathe for both internal and external thread-gage grinding, this 

 machine is also intended as a grinding machine when used on 

 the bench, and as a 

 grinding attachment 

 to be applied to 

 lathes, milling ma- 

 chines, shapers, 

 planers, etc., to han- 

 dle a variety of 

 work. The grind- 

 ing-wheel spindle- 

 bearing housing has 

 a longitudinal move- 

 ment in a saddle, 

 which in turn has 

 a vertical movement 

 on the column. A 

 swivel is provided 

 with a protractor 

 of large radius for 

 inclining the grind- 

 ing-wheel spindle, when thread grinding, to suit the helix angle. 

 Micrometer dials are provided for both longitudinal and vertical 

 adjustments, making it very convenient to obtain accurate settings 

 whenever required for precision work. This machine is designed 

 and manufactured for grinding within 0.0001-inch, and all of its 

 parts are interchangeable. (Lafayette Tool & Equipment Co., 

 Lafayette. Indiana.) 



RETREAD MOLD AND SECTIONAL VULCANIZER. 



A compact, combination retread mold and sectional vulcanizer 

 is being introduced on the Pacific Coast that can not only cure 

 maximum size tires, including cord tires, in its one-third-circle 



Un^'ersal Tool Grinder. 



-iEPAiR Mold. 



matrix, but with bead molds, which can be supplied, sections may 

 be vulcanized in the same mold as readily as in the ordinary sec- 

 tional vulcanizer. It has a self-contained boiler, full steam-jacketed 

 walls, and raised steam-jacketed center section to take bead molds 

 when using it as a sectional vulcanizer. Non-heat-conducting 

 blocks on the ends of the mold prevent the stock from flowing, 

 blistering, or leaving a burr on the ends of a cure. The rib 

 tread is machined in the solid casting; and, it is claimed, the re- 

 treaded tire has the appearance of a new cord tire. 



The complete unit includes five strong steel clamps, gas burner, 

 steam gage, safety valve, overflow valve, filler, filler valve, spring 

 steel pressure band, wrench, and mill hose sand bag. If desired, 

 connections can be provided for steam plant line, or for gasoline 

 or kerosene gas burners. (L. L. Caldwell Co., 1128 Van Nuys 

 Building, Los Angeles, California.) 



STOCK CUTTER FOR SMALL MOLDED GOODS. 



Rubber manufacture requires so many different processes that 

 machines in great variety are employed. The mechanical engineer 

 in a modern rubber mill is keen on labor-saving machinery and 

 does not hesi- 

 tate to adopt a 

 machine or ap- 

 pliance used in 

 other trades. 



A case in 

 point is the 

 power vertical 

 caramel cutter 

 shown in the 

 ace o mpanying 

 illustration that 

 will find ready 

 use as a stock 

 cutter for small 

 molded goods. 

 It will cut any 

 width from 



1/16-inch to 2 inches, the platen being automatically moved for- 

 ward by a ratchet-and-pawl feed. Squares of any size may be 

 cut by turning the cut sheet of stock and again running it through 

 the machine. Another type of machine employs a knife that 

 operates with a shearing cut. (Thomas Mills & Bro., Lie, Phila- 

 delphia, Pennsylvania.) 



Sheet Stock Cutter. 



MACHINERY PATENTS. 

 APPARATUS FOR MAKING CARLISLE CORD TIRES. 



A BAND of composite material consisting of a plurality of rub- 

 berized cords is first laid in parallel contact on a sheet of 

 uncured rubber. The rubber sheet of the correct width and 



Carlisle Cord Tire Apparatus. 



length is applied to the periphery of the drum shown in Fig. 1 

 and the cord spirally laid on the sheet by revolving the drum. 

 When the winding is completed the composite band is severed 



