Section 7 ─ Unit 1 Introduction to Precision Grinding Machines © 2012 Delmar, Cengage Learning Introduction to Precision Grinding Machines • Precision grinding: like offhand grinding but machines hold work securely for greater accuracy –Grinds hardened steel to final dimensions & produces fine surfaces • Precision grinding machines: –Surface grinders produce flat surfaces • Horizontal spindle grinds with wheel periphery • Vertical spindle grinds with side of wheel © 2012 Delmar, Cengage Learning A B FIGURE 7.1.1 Two types of horizontal spindle surface grinders. (A) reciprocating (the most common) and (B) rotary. © Cengage Learning 2012 © 2012 Delmar, Cengage Learning FIGURE 7.1.2 The wheel head of the surface grinder supports and rotates the grinding wheel. A guard surrounds the wheel for protection in case of wheel failure. © Cengage Learning 2012 FIGURE 7.1.3 The elevating hand wheel of the horizontal surface grinder. Note the 0.0001" increments for downfeed measurements. © Cengage Learning 2012 © 2012 Delmar, Cengage Learning FIGURE 7.1.4 The longitudinal-feed hand wheel, used to move the workpiece back and forth beneath the grinding wheel. © Cengage Learning 2012 FIGURE 7.1.5 The cross-feed hand wheel, used to move the workpiece across the wheel between longitudinal passes. © Cengage Learning 2012 © 2012 Delmar, Cengage Learning FIGURE 7.1.6 An automatic surface grinder. © Cengage Learning 2012 FIGURE 7.1.7 Example of a grinding wheel used on a vertical spindle surface grinder. © Cengage Learning 2012 © 2012 Delmar, Cengage Learning Precision Grinding Machines (cont'd.) • Cylindrical grinders –Grind diameters, shoulders, and faces like a lathe, • Tool and cutter grinders –Used for tool sharpening, offhand or with workholders • The jig grinder –Like vertical milling machine with more precise X- and Y-axis movement © 2012 Delmar, Cengage Learning A B FIGURE 7.1.8 Table movement on a vertical spindle surface grinder can be (A) reciprocating or (B) rotary. Courtesy of DCM Tech, Winona, MN. © 2012 Delmar, Cengage Learning FIGURE 7.1.9 A cylindrical grinder set up for grinding an outside diameter. Note how the part is held so that it can rotate. © Cengage Learning 2012 FIGURE 7.1.10 A cylindrical grinder set up to grind a shoulder on a part. © Cengage Learning 2012 © 2012 Delmar, Cengage Learning FIGURE 7.1.11 A cylindrical grinder set up for grinding an internal diameter. © Cengage Learning 2012 FIGURE 7.1.12 A spindle- mounted magnetic chuck. © Cengage Learning 2012 © 2012 Delmar, Cengage Learning FIGURE 7.1.13 A centerless grinder rotates work with the regulating wheel while a grinding wheel removes material. © Cengage Learning 2012 © 2012 Delmar, Cengage Learning FIGURE 7.1.14 A tool and cutter grinder is used for sharpening cutting tools and creating customized cutting tools. © Cengage Learning 2012 © 2012 Delmar, Cengage Learning FIGURE 7.1.15 A jig grinder. © Cengage Learning 2012 © 2012 Delmar, Cengage Learning.