Böcker av Marcus Bowman

The cutting edges on engineering tools must lie at precise angles to ensure effective cutting, and sharpening must recreate the original geometry of each tool. This book provides an understanding of what is involved in sharpening typical lathe, milling, drilling and threading tools. With over 550 photographs and illustrations this new book covers sharpening techniques for the most commonly used engineering tools, screwdrivers and gravers, lathe, milling, reaming, drilling and threading cutters. It identifies the two principal types of workhead, and discusses the ways in which their geometry affects typical sharpening setups. It teaches how to use the three basic movements of swing, tilt and rotate to position a tool against a grinding wheel to ensure correct tool angles and sharp cutting edges. Contains useful tables for setting cutting and clearance angles and provides general advice on tool and cutter grinders, and includes examples of the use of workholders to suit a range of tools. Includes information on abrasive materials and the types and shapes of grinding wheel suitable for use on a tool and cutter grinder. Finally, it shows photos of accessories that can be made to simplify setups, including workheads, toolholders and fixtures used to hold circular saws, parting tools and dies, as well as an angle gauge to quickly set clearance angles on reamers and milling cutters.

Using sharp tools is one of life's great joys. A sharp tool feels right; the job seems that much easier; and the quality of the cut usually means there is less work to do to produce a finished surface on the object. This book provides an understanding of what is involved in sharpening common workshop tools. With over 580 colour photographs and illustrations it covers sharpening techniques for the most commonly used tools - scissors, shears, knives, lathe tools and drills, screwdrivers, chisels and punches, along with the more specialist gravers and scrapers. Advice on types of abrasives, grades, grits and mesh sizes is given. It describes what happens during the sharpening process and provides practical guidance on using sharpening stones and grinding wheels on a bench grinder. Provides essential maintenance instructions such as how to restore the surface of a flat stone and the face of the wheel on a bench grinder. Finally, it gives advice on bench grinders, and includes examples of the use of readily available tools and accessories such as vee blocks, toolposts, collet holders, protractors and gauges.

Screwcutting is a guide to the theory and practice of threads and thread-making, whether that is threading a hole using hand tools or cutting a thread using a lathe. The book covers details of the major threadforms, such as metric, Whitworth and Unified threads, as well as the British Association (BA) and Model Engineering (ME and MME) series, the smaller metric and Unified threads, pipe threads, and specialist threads such as ACME, trapezoidal and RMS microscope threads. Techniques for making threads manually, as well as screwcutting in the lathe are also covered. As well as covering the basics of screwcutting, this book examines higher-level and advanced techniques, using case studies to demonstrate what can be achieved - fine, accurate and well-finished work.