tailieunhanh - Handbook of Shaft Alignment Part 14

Tham khảo tài liệu 'handbook of shaft alignment part 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 620 Shaft Alignment Handbook Third Edition View looking down the axis of rotation through clear shafts FIGURE View through the axis of rotation. One way to accomplish this measurement is to perform the double radial method refer to Chapter 12 . As shown in Figure the dial indicator measurements can be taken on the inside bore of a cylinder rather than capturing the measurements on the outside of a cylinder . a shaft . Remember that you will have to compensate for the bracket sag that occurs at both the near and far indicators. You also have to be aware of the fact that you are reading an inside diameter and the sign of the measurement from the top to the bottom or side to side will be opposite of what it would be if you were measuring the outside diameter. V o a o và aft FIGURE Motor and barrel. Bore Alignment 621 Centerline of rotation Centerline of barrel is in line only with the end of the motor shaft FIGURE Pure angular misalignment of motor shaft and barrel centerline. For example with the indicator set up to take a reading on the inside of the barrel if the indicator is zeroed at the top of the inside of the barrel then rotated to the bottom and the dial indicator measured a 20 the barrel appears to be high at that point. If instead the indicator was set up to take a reading on the outside of the barrel if the indicator is zeroed at the top of the outside of the barrel then rotated to the bottom the dial indicator would measure a 20. Figure shows the dimensions and double radial measurements that were taken on the motor and barrel. Figure and Figure show the side and top view alignment models. Taking measurements on the outside of a cylinder Taking measurements on the inside of a cylinder FIGURE Double radial method measuring outside and inside of cylinders. 622 Shaft Alignment Handbook Third Edition 56 in. 24 in. 20 in. 0 -36 -20 Far indicator 16 0 -14 10 Sag Near indicator 24 compensated readings 7 - FIGURE .