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127. Why do costs tend to increase when better surface finish is required on a machined part? 128. What are the basic factors that affect surface finish in machining? 129. Why are abrasive processes technologically and commercially important? 130. What are the five principal parameters of a grinding wheel? 131. What are some of the principal abrasive materials used in grinding wheels? 132. Name some of the principal bonding materials used in grinding wheels. 133. What is wheel structure? 134. What is wheel grade? 135. Why are specific energy values so much higher in grinding than in traditional machining processes such as milling? 136. Grinding creates high temperatures. How is temperature harmful in grinding? 137. What are the three mechanisms of grinding wheel wear? 138. What is dressing, in reference to grinding wheels? 139. What is truing, in reference to grinding wheels? 140. What are the functions of a grinding fluid?