Abrir en caso de Apocalipsis. Guía rápida para reconstruir by Lewis Dartnell

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By Lewis Dartnell

«Una mirada fascinante a los principios básicos de las principales tecnologías que sostienen l. a. sociedad contemporánea». Wall road magazine Una pandemia incontrolable, el impacto de un meteorito, o quizá una guerra nuclear; por el motivo que sea, el mundo que conocemos ha desaparecido y los escasos supervivientes deben comenzar de cero. ¿Cuáles son los conocimientos fundamentales necesarios para reconstruir nuestra civilización? Tras recoger lo poco lo poco que queda, ¿cómo se puede empezar a producir lo esencial? ¿Cómo cultivar alimentos, generar electricidad, preparar medicinas o extraer steel de las rocas? ¿Se puede evitar una nueva edad oscura y aprovechar los atajos para conseguir de nuevo el desarrollo? los angeles vida en las sociedades contemporáneas nos han desconectado de los procesos básicos que nos sostienen, así como de las elegantes premisas científicas que permiten aprender las cosas por uno mismo. Abrir en caso de apocalipsis es un viaje de exploración, un libro que explica todo lo que hay que saber acerca de todo lo que nos rodea. Una guía rápida para reiniciar los angeles civilización que transformará nuestra comprensión del mundo, y nos ayudará cuando este ya no exista. l. a. crítica ha dicho... «Un maravilloso compendio de los conocimientos que hemos olvidado. El libro más inspirador que he leído en mucho tiempo». Peter Forbes, self reliant «Un libro extraordinario, una lectura estupenda incluso si los angeles civilización no desaparece. Si lo hace, será l. a. biblia del nuevo mundo, y Dartnell su profeta». the days «Una fascinante historia de los angeles ciencia y los angeles tecnología». Steven Poole, The parent

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53A120K8V127 52100 Rc60 De =11,4 INCH SYMBOL -z 2 A B .... p, ~ (a) ~ z ~ ~ " :J: '-J' ..... a: w B o B ~ ~O'/ 3: o a.. /' ... ~~ ,A'" of) \ J / O 'O ~ N 'A o \2 Fig. 2 z 52100 6000FPM "JO~\tY : a ) ~/ ~'iD ~"/ c/C Fig. 13 " 0.. :I: '--' o a. '" :\ "COO FN' Z - 20 3 c 100 - 0:: W 10 c O. 6 150 (LSI IN) I I 2 Zw (Iwl MIN,IN) Wheelspeed effects: external grinding Fig. 13 shows similar data for external grinding. /inch. 39 vs. 3 hp/inch3 per minute. 6 hp/inch. So, as in Fig. 970 (where the two lines intersect), the highspeed system will require higher power.

3 The system characteristic chart 34 Handbook of Modern Grinding Technology lb/inch force, there was no metal removal rate, but after that Z~ was linear with normal force. The 20 lb/inch is labeled F;h the threshold force, because it was the force threshold that had to be overcome to cause metal removal. The slope of the Z~ vs. 014 inch 3 minute, lb. The magnitude, or "steepness," of that line is important because it defines how "sharp" the system is cutting. A steep slope means fast-cutting ("free-cutting") and low forces; a shallow slope means slow-cutting ("hard-acting") and high forces.

5%. 23a (for 12000 fpm) shows equivalent WRP slopes. 6% here) using the soluble oil. So, in 3 cases, there were substantial reductions in power requirements using higher-quality fluids. Users fighting surface integrity requirements (metallurgical damage or residual stresses) should be aware that anything that reduces forces and power in grinding will help them. Higher-quality, and probably more expensive fluids can reduce forces and power. The Work Removal Parameter Equation As part of the author's doctoral thesisS an equation was developed predicting the work removal parameter, WRP, using all the factors for a particular grinding system.

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