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3. Convert the decimal value 2764 to binary coded decimal, using Table 7.4. Provide your answer in table exactly like Example 7.4 Number Sequence Binary Number Decimal Value First Second Third Fourth Sum EXAMPLE 7.4 Binary Coded Decimal Convert the decimal value 1,258 to binary coded decimal. Solution: The conversion of the four digits is shown in the following table: Number Sequence Binary Number Decimal Value First 0001 1,000 Second 0010 200 Third 0101 50 Fourth 0000 8 Sum 1,258 TABLE 7.4 Comparison of Binary and Decimal Numbers Binary Decimal Binary Decimal 0000 0 0101 5 0001 1 0110 6 0010 2 0111 7 0011 3 1000 8 0100 1001 9 Downloaded From : EasyEngineering.net Downloaded From : EasyEngineering net 180 Chap. 7 / Computer Numerical Control is formed. A word specifies a detail about the operation, such as x-position, y-position, feed rate, or spindle speed. Out of a collection of words, a block is formed. A block is one complete NC instruction. It specifies the destination for the move, the speed and feed of the cutting operation, and other commands that determine explicitly what the machine tool will do. For example, an instruction block for a two-axis NC milling machine would likely include the x- and y-coordinates to which the machine table should be moved, the type of motion to be performed (linear or circular interpolation), the rotational speed of the milling cutter, and the feed rate at which the milling operation should be performed. The organization of words within a block is known as a block format. Although a number of different block formats have been developed over the years, all modern con- trollers use the word address format, which uses a letter prefix to identify each type of word, and spaces to separate words within the block. This format also allows for varia- tions in the order of words within the block, and omission of words from the block if their values do not change from the previous block. For example, the two commands in word address format to perform the two drilling operations illustrated in Figure 7.15 are VO VAGON