Tham khảo tài liệu 'handbook of shaft alignment episode 3 part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 750 Shaft Alignment Handbook Third Edition FIGURE Callahan s shaft alignment device 1953. 1990 Malcolm Murray files . patent for vernier-strobe method used to measure off-line to running machinery movement data. 1991 Dieter Busch files . patent for laser-detector-prism system used to measure off-line to running machinery movement data. Paul Saunders files . patent for electronic shaft alignment system utilizing optical encoder. There you have it. A brief run through the last 6000 years of human existence illustrating the engineering triumphs during periods of unparalleled growth in science and technology interspersed with periods of dismal ignorance. In many cases it is not clear who actually invented certain methods and devices. The vast majority of . patents for aligning and leveling machinery filed from 1860 to 1946 fell into the following categories FIGURE Bently s shaft alignment device 1974. The History of Machinery Alignment 751 34a 34b 37 41 FIGURE Murray s shaft alignment device 1983. Use of spirit dumpy levels to set the positions of shafts in line with each other Centering devices for work pieces on lathes Use of a tight wire for alignment of engine cylinder bores The technology of shaft alignment as we recognize it today really did not emerge until the 1940s and 1950s followed by a flurry of patent activity that persists to the present day. Between 1860 and 1950 only 11 . patents were filed relating to measuring off-line shaft centerline positions the majority of which exclusively dealt with aligning and leveling line shafts typically used in the paper industry. Over 60 years had passed since John Logan patented the dial indicator before Joseph Christian actually filed a patent using this device for alignment of rotating machinery shafts. However this does not necessarily mean that shaft alignment was not performed on rotating machinery during the early part of the Industrial Revolution. As we have seen throughout .
