Tham khảo tài liệu 'cutting tools episode 2 part 2', 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 11 Reaming and Tanning 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 Prentice Hall- Introduction Twist drills do not make accurately sized or good finish holes a reamer of some type is often used to cut the final size and finish. A reamer will not make the original hole it will only enlarge a previously drilled or bored hole. It will cut to within inch of tool size and give finishes to 32 micro inches u in . Reamers are usually made of HSS although solid carbide and carbide tipped reamers are made in many sizes and styles. Regular chucking reamers are made in number and letter sizes in fractional inch sizes and in millimeter sizes. They can be purchased ground to any desired diameter. Screw threads are used for a variety of purposes and applications in the machine tool industry. They are used to hold or fasten parts together screws bolts and nuts and to transmit motion the lead screw moves the carriage on an engine lathe . Screw threads are also used to control or provide accurate movement the spindle on a micrometer and to provide a mechanical advantage a screw jack raises heavy loads . When defining a screw thread one must .
