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Page 7-3 - Continued is necessary, therefore, that the mechanic first find the approximate size of the work to the nearest inch, and then select a micrometer that will fit it. For example, to find the exact diameter of a piece of round stock use a rule and find the approximate diameter of the stock. If it is found to be approximately 3-1/4 inches, a micrometer with a 3- to 4-inch range would be required to measure the exact diameter.
Page 7-8 - The -inch and -inch marks are commonly made longer than the smaller division marks to facilitate counting, but the graduations are not, as a rule, numbered individually, as they are sufficiently far apart to be counted without difficulty. The opposite side is similarly divided into 32 and 64 spaces per inch, and it is common practice to number every fourth division for easier reading. There are many variations of the common rule. Sometimes the graduations are on one side only, sometimes a set of...
Page 7-8 - Generally a rule has four sets of graduations, one on each edge of each side. The longest lines represent the inch marks. On one edge, each inch is divided into 8 equal spaces, so each space represents % inch. The other edge of this side is divided into sixteenths. The y...
Page 7-2 - range." The frames of micrometers, however, are available in a wide variety of sizes, from 1 inch up to as large as 24 inches. The range of a...
Page 16-5 - They consist of a graduated beam 8 inches long on which a head slides. The head can be fastened at any point on the beam by means of a thumbscrew. The thumbscrew presses a brass shoe tightly against the beam and locks it firmly in position. The steel pin or spur that does the marking projects from the beam about Figure 72.
Page 38-2 - Taps and Dies Taps and dies are used to cut threads in metal, plastics, or hard rubber. The taps are used for cutting internal threads, and the dies are used to cut external threads. There are many different types of taps.
Page 16-3 - The distance from the center of one tooth to the center of the next tooth, measured on the pitch circle, is called the circular pitch.
Page 7-8 - These folding rules are usually 2 to 6 feet long. The folding rules cannot be relied on for extremely accurate measurements because a certain amount of play develops at the joints after they have been used for a while. Steel tapes are made from 6 to about 300 feet in length.
Page 7-4 - ... covered by one complete and exact revolution of the thimble. Every fifth line on the thimble is numbered. To read a measurement in thousandths of an inch: To the number of hundreds of thousandths of an inch indicated by the highest figure visible on the barrel, add ,025 in.
Page 7-8 - The 1/4-in. and 1/2in. marks are commonly made longer than the smaller division marks to facilitate counting, but the graduations are not, as a rule, numbered individually, as they are sufficiently far apart to be counted without difficulty. The opposite side is similarly divided into 32 and 64 spaces per inch, and it is common practice to number every fourth division for easier reading. There are many variations of the common rule.