tailieunhanh - Handbook of Shaft Alignment Part 9

Tham khảo tài liệu 'handbook of shaft alignment part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 370 Shaft Alignment Handbook Third Edition Rim dial indicator PROCEDURE 1. Attach the alignment bracket firmly to one shaft and position the indicators on the face and diametral surface of the other shaft or coupling hub . Face dial indicator 2. Zero the indicators at the twelve o clock position. 3. Slowly rotate the shaft and bracket arrangement through 90 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 steps 2 through 4 to verify the first set of readings. Indicator readings log 45 0 N 13 Face readings 72 Rim or peripheral readings -18 B T 0 FIGURE Face and rim method and procedure. collinear relationship when off-line on one or the other machine case. It is an either-or condition. If you decide to keep the driver stationary you solve for the moves on the driven machine or vice versa. SIXTEEN-POINT METHOD A method similar to the face-rim method called the 16-point method is frequently used on rotating machinery connected together by rigid rather than flexible couplings. The general procedure is illustrated in Figure . This method is typically used where one shaft is supported in two bearings and the other shaft is supported in one bearing on the outboard end. The coupling flanges have a recessed rabbeted fit. The assumption made when performing this technique is that there is only pure angular alignment present . no centerline offset and that the flange faces are Face and Rim Methods 371 Front side face reading starting plane Back side face reading starting plane Indicator stem will move outward when it gets to the bottom resulting in a negative - reading Indicator stem will get pushed in when it gets to the bottom resulting in a positive reading. FIGURE Face readings can be taken on the front or back sides. perpendicular to the centerlines of rotation. The flange bolts are loosened the shafts separated .