Hand Tools CHAPTER 2 Objectives After studying this chapter, you will be able to: • Identify the various types of hand tools. • Describe the advantages and disadvantages of each type of hand tool. • Select the proper hand tool for the job. • Demonstrate skills in using various hand tools. • Demonstrate how to use hand tools safely. • Maintain, repair, or replace damaged tools. • Demonstrate good craftsmanship in the performance of daily tasks. Important Terms arbor cheater cheek dressed flutes hexagonal hex-head mushroomed points serrated shank socket struck tool swing space torque universal joint whetstone 2.1 Tools for Technicians The job of the refrigeration, heating, and air conditioning technician consists mainly of performing mechanical operations and using common tools and materials. A good technician performs each task properly the first time. Tool skills are valuable to the technician and are acquired through experience and practice. Successful technicians select quality tools, care for them properly, and skillfully use them. Technicians who have good tool skills also have good mechanical skills. Misuse of tools indicates poor mechanical skills that can result in delays, callbacks, and injuries. A beginning technician usually starts with a basic set of hand tools for regular use and then gradually adds other tools as needed. Some tech- nicians carry frequently used hand tools in a tool pouch others prefer toolboxes. Master technicians may have several boxes of tools so they always have exactly the right tool for the job. 2.2 Wrenches Wrenches are the most widely used type of hand tool. They are used to hold or turn nuts, bolts, cap screws, and other fasteners and can be used to clamp parts together. Applying too much torque (turning force) can strip bolt threads or break off bolt heads. Quality wrenches are designed to keep leverage and load in safe balance. Caution Wrench Leverage Never use a pipe extension or other type of “cheater” to increase the leverage of a wrench. Always select a wrench with an opening that exactly fits the nut. Wrench size is determined by measuring across the jaw opening. The wrench size is stamped on the side of the tool. 17 Copyright Goodheart-Willcox Co., Inc.