By E. J. H. Jones
This early paintings through E. J. H. Jones is either dear and tough to discover in its first variation. Its 334 pages comprise a wealth of data on jig and gear layout together with chapters on fabrics, gauges, grinding wheels, all followed with precise technical drawings. this can be a attention-grabbing learn for someone drawn to the intricacies of tooling and their old tools of creation. a few of the earliest books, relatively these courting again to the 1900s and ahead of, at the moment are tremendous scarce. we're republishing those vintage works in reasonable, top of the range, glossy variations, utilizing the unique textual content and paintings
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Extra info for Production Engineering. Jig and Tool Design
For internal checking, special hanger brackets are fitted to the anvils. Angular measurements The protractor is the most commonly used instrument for measurement of angles, the better class of instrument incorporating a vernier scale by which angles can be determined within about 10 minutes of arc. The sine bar Errors in a good quality sine bar correspond to about 5 seconds of arc in the measured angle. Normally, a sensitive indicator is used to set one face of the gauge being checked in a truly horizontal position.
The interference on vee-threads, is however, so slight as to be negligible. It is greater on internal than on external threads, and for internal work, the cutter diameter should not exceed one-third of the bore to be threaded. Thread grinding The grinding wheel should be made from an aluminium abrasive with a resined or vitrified bond if operating on steel. A wheel of fine texture is required, with free cutting qualities. F o r coarse pitches a grit size of 180, for medium pitches 220, and for fine pitches 280 should be used.
H. H. CUTTING SECTION. 10 Standard SHOWING NEGATIVE RAKE FRONT reamer itself into the work, as would be the tendency if the spiral was made right hand. T h e flutes should be so made that the cutting edges have a slight negative rake, a n d further, t o prevent chatter through t o o even balancing of the cut, the fluting should be unevenly spaced. A small a m o u n t is quite sufficient—a variation of 2° or 3° in spacing being adequate. A slight 'land' that is part of the true diameter should be left to act as guide and pilot for keeping the hole in line.