TAILIEUCHUNG - Machinery Components Maintenance And Repair Episode 1 Part 10

Tham khảo tài liệu 'machinery components maintenance and repair episode 1 part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Machinery Alignment 215 Figure 5-13. Testing for bracket sag. hub with the dial indicator plunger touching the top vertical rim of the opposite coupling hub. Set the dial indicator to zero. Next locate the sling in the same relative position as before and while observing the scale apply an upward force so as to repeat the previous scale reading assumed lbs in our example . Note the dial indicator reading while holding the upward force. Let us assume for example that we observe a dial indicator reading of in. Using this specific methodology sag error applies equally to the top and bottom readings. Therefore the sag correction to the total indicator reading is double the indicated sag and must be algebraically subtracted from the bottom vertical parallel reading . - 2 correction to bottom reading. This method is a clever one for face-mounted brackets. For clamp-on brackets however it would be easier and more common to attach them to a horizontal pipe on sawhorses and roll top to bottom. Figure 5-14 shows this conventional method which except for the sag compensator device is almost universally employed. The sag compensator feature incorporates a weight-beam scale which applies an upward force when the indicator bracket is located at the top of the machine shaft and an equal but opposite force when the indicator bracket and shaft combination is rotated to the down position 180 removed. In any event let us assume that we obtain readings of 0 and in. at the top and bottom vertical parallels respectively. We correct for sag in the following manner 216 Machinery Component Maintenance and Repair Figure 5-14. Sag compensator. Using the first method of sag determination we observe bottom parallel reading . Sag correction - 2 . Corrected bottom parallel reading . Bracket Sag Effect on Face Measurements Bracket sag is generally thought to primarily affect rim readings with little effect on face readings. Often

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