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Handbook Of Shaft Alignment Episode 2 Part 5

Tham khảo tài liệu 'handbook of shaft alignment episode 2 part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 390 Shaft Alignment Handbook Third Edition PROCEDURE 1. Attach the alignment bracket s firmly to one shaft and position the indicator s on the perimeter of the other shaft or coupling hub . It is not required to set both indicators up at the same time i.e. set up at the near location then set it up again at the far location . 2. Zero the indicator s at the twelve o clock position. 3. Slowly rotate the shaft and bracket arrangement through 908 intervals stopping at the three six and nine o clock positions. Record each reading plus or minus . 4. Return to the twelve o clock position to see if the indicator s re-zero. 5. Repeat step 2 through step 4 to verify the first set of readings. Indicator readings log Near indicator 86 Far indicator 26 FIGURE 12.1 Double radial method and procedure. condition. The pump shaft which is supported by the thrust bearing on top of the motor drops down and is physically centered in its upper bushing using feeler gauges or wedges. Once this is done the pump shaft should not be rotated to prevent damaging the impeller from dragging FIGURE 12.2 Double radial method used between an output shaft of a gear which could be rotated with an indicator measuring the near position on a gear input shaft that could not be rotated. Double Radial Method 391 FIGURE 12.3 Double radial method used between an output shaft of a gear which could be rotated with an indicator measuring the far position on a gear input shaft which could not be rotated. on the pump housing. As the motor shaft can still be rotated and there is a significant distance of pump shaft exposed the double radial method is a good choice for this alignment situation. 12.1 BASIC MATHEMATICAL EQUATIONS FOR THE DOUBLE RADIAL METHOD Figure 12.6 shows the mathematical relationship between the machinery dimensions and the dial indicator readings captured using the double radial method. The equations will solve for the moves that need to be made to correct the misalignment condition i.e. bring