By E. J. H. Jones
This early paintings by way of E. J. H. Jones is either pricey and difficult to discover in its first version. Its 334 pages include a wealth of data on jig and power layout together with chapters on fabrics, gauges, grinding wheels, all followed with distinct technical drawings. this can be a attention-grabbing learn for someone drawn to the intricacies of tooling and their old tools of construction. a number of the earliest books, really these courting again to the 1900s and earlier than, at the moment are tremendous scarce. we're republishing those vintage works in cheap, top of the range, smooth variants, utilizing the unique textual content and art
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Additional info for Production Engineering. Jig and Tool Design
Example text
The action produces no wear of the dies by abrasion and they seldom require re-grinding, so they have a long life and when ultimate failure takes place it is usually by crumbling of the metal. Cylindrical dies (d) are about 160 m m diameter, one rotating clockwise on a stationary support and the other rotating in the same direction in a movable carriage fed towards the stationary support by a hydraulic cylinder. The blank rests in a horizontal position on a supporting blade between the rolls, and rotates while it moves axially.
Thus, the variations in measurement can be indicated on a microammeter scale calibrated in linear units. 17 which depicts the Electro-limit head. The measuring plunger, when raised, moves the iron armature which is supported by a flexible spring-steel strip. Movement of the armature changes the characteristics of the magnetic fields associated with the coils wound on the pole-pieces shown. c. bridge, the change in reactance in the coils leading to a current change in the bridge which is indicated on a microammeter calibrated to read in linear units In the Sigma signal comparator components can be classified as correct, oversize or undersize according to which coloured light is illuminated, the colours showing amber, green, or red.
High-speed steel High-speed steel containing 14, 18, and 2 2 % tungsten, with small inclusions of the other alloying metals, is used for almost all types of cutting tools, including the taps, reamers, and broaches mentioned above, and is the steel which has superseded the carbon tool steel because of the much faster speed at which it will cut satisfactorily; softening of the tool does not occur at temperatures below 660°C. Care should be taken in the selection of highspeed steel for particular tools—for form tools a steel should be chosen which distorts as little as possible in hardening, so that the a m o u n t of stoning or grinding required for correcting is kept to a minimum.