Tham khảo tài liệu 'cutting tools episode 2 part 1', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Upcoming Chapters Metal Removal Cutting-Tool Materials Metal Removal Methods Machinability of Metals Single Point Machining Turning Tools and Operations Turning Methods and Machines Grooving and Threading Shaping and Planing Hole Making Processes Drills and Drilling Operations Drilling Methods and Machines Boring Operations and Machines Reaming and Tapping Multi Point Machining Milling Cutters and Operations Milling Methods and Machines Broaches and Broaching Saws and Sawing Abrasive Processes Grinding Wheels and Operations Grinding Methods and Machines Lapping and Honing Chapter 10 Boring Operations Machines Introduction Boring also called Internal Turning is used to increase the inside diameter of a hole. The original hole is made with a drill or it may be a cored hole in a casting. Boring George Schneider Jr. CMfgE Professor Emeritus Engineering Technology Lawrence Technological University Former Chairman Detroit Chapter ONE Society of Manufacturing Engineers Former President International Excutive Board Society of Carbide Tool Engineers Lawrence Tech. Univ. http Prentice Hall http achieves three things Sizing Boring brings the hole to the proper size and finish. A drill or reamer can only be used if the desired size is standard or if special tools are ground. The boring tool can work to any diameter and it will give the required finish by adjusting speed feed and nose radius. Precision holes can be bored using micro adjustable boring bars Fig. Straightness Boring FIGURE Adjustable boring bar for precision holes. Courtesy National Acme Co. Div. DeVlieg-Bullard Inc. will straighten the original drilled or cast hole. Drills especially the longer ones may wander off- center and cut at a slight angle because of eccentric forces on the drill occasional hard spots in the material or uneven sharpening of the drill see Fig. . Cored holes in castings are almost never completely straight. The boring tool being moved .
