tailieunhanh - Handbook Of Shaft Alignment Episode 2 Part 9

Tham khảo tài liệu 'handbook of shaft alignment episode 2 part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 510 Shaft Alignment Handbook Third Edition How to level optical tilting levels and jig transits Split coincidence level Circular level Leveling screws 1. Set the instrument stand at the desired sighting location attach the alignment scope to the tripod or instrument stand and level the stand using the rough circular bubble level on the tripod if there Tilti screw is one on the tripod . Insure that the stand is steady and away from heat sources vibrating floors and curious people who may want to use the scope to see sunspots. 2. Rotate the scope barrel to line up with two of the four leveling screws and adjust these two leveling screws to roughly center the split coincidence level bubble in the same tilt plane as the two screws that are adjusted as shown. 3. Rotate the scope barrel 90 to line up with the other two leveling screws to completely center the bubble in the circular level as shown. 4. If the circular level is still not centered repeat steps 2 and 3. . and then Adjust these two leveling screws to first adjust the circular level in one direction . FIGURE How to level a tilting level or jig transit parts 1 through 4. these two screws for the other direction. ESTABLISHING REFERENCE PLANES Since there is a good possibility that the off-line measurements will be taken at a different time than the running measurements it is suggested that vertical and lateral reference positions be established. Understand that if you take a set of elevations on scale targets attached to the machinery bearings as shown in Figure when the equipment is off-line then dismantle the optical instrument and tripod and if you go to set the instrument and tripod backup at a later time the question now becomes what was the original elevation of the instrument when the first set of vertical measurements were taken One of the primary considerations when using any method where you are observing points on a machine case with respect to a remote observation point is to .