The mechanic's tool bookWith practical rules and suggestions for use of machinists, iron-workers and others . ey work in the manner in which theywere taught. Every mechanic has at times ob-served that there was a certain angle which, whengiven to the cutting lines of tools, was more ef-fective and resisted the action of the material inwhich the tools operated, better than others ; butwith the exception of an effort to remember theselines by the eye, he has no gauge or guide to as-sist him in the production of the same angleagain. It is generally acknowledged that the cuttingangle of a lathe-tu
The mechanic's tool bookWith practical rules and suggestions for use of machinists, iron-workers and others . ey work in the manner in which theywere taught. Every mechanic has at times ob-served that there was a certain angle which, whengiven to the cutting lines of tools, was more ef-fective and resisted the action of the material inwhich the tools operated, better than others ; butwith the exception of an effort to remember theselines by the eye, he has no gauge or guide to as-sist him in the production of the same angleagain. It is generally acknowledged that the cuttingangle of a lathe-turning tool operates best, is themost effective, and has the greatest strength,when formed with an angle of about 60°; and thissame angle, which in tools of this kind may becalled the angle of strength, can be formed to ad-vantage in all tools which are used to operate iniron or steel. The angle of 60° is easily formed and as easily 54 mechanics tool book. remembered. To obtain the proper proportions,insert a circle, and in this circle draw an equilat-eral triangle, the points of which intersect the di-. Fig. 13. ameter of the circle, and this angle has 60°, andhas been found by experience to be the strongestand most durable form that can be given to aniron-cutting tool. If the reverse of this angle, oran indented V of the same form, be made in apiece of metal, it will form a gauge or guide bywhich to form the cutting edges of nearly all thetools of the iron-worker. We have mentioned the lathe-turning tool as aninstance of the efficacy of this angle. The chip-ping or cold chisel is another example, and thereis no tool the edge of which is subjected to agreater amount of rough usage and strain, andmore liable to give way, than this simple tool; butif its cutting angle be formed to lines which meetat an angle of 60°, it will be found to stand moreblows and wear longer than any other angle. Fordelicate work a more acute angle may be used, THE ANGLE OF 60°. 55 but for ordinary
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Keywords: ., bookcentury1800, bookdecade1860, bookpublishernewyo, bookyear1868
