TAILIEUCHUNG - The importance of shaft alignment.The most frequently asked questions by managers, engineers,

The importance of shaft alignment .The most frequently asked questions by managers, engineers, foremen, contractors, and trades people concerning the subject of shaft (mis)alignment and its importance in maintaining industrial rotating machinery are discussed. What exactly is shaft alignment? In very broad terms, shaft misalignment occurs when the centerlines of rotation of two (or more) machinery shafts are not in line with each other. As simple as that may sound there still exists a considerable amount of confusion to people who are just beginning to study this subject when trying to precisely define the amount of misalignment that may exist between. | The importance of shaft alignment d Il ei ortit Il mllf i The most frequently asked questions by managers engineers foremen contractors and trades people concerning the subject of shaft mis alignment and its importance in maintaining industrial rotating machinery are discussed. What exactly is shaft alignment In very broad terms shaft misalignment occurs when the centerlines of rotation of two or more machinery shafts are not in line with each other. As simple as that may sound there still exists a considerable amount of confusion to people who are just beginning to study this subject when trying to precisely define the amount of misalignment that may exist between two shafts flexibly or rigidly coupled together. How accurate does the alignment have to be How do you measure misalignment when there are so many different coupling designs Where should the misalignment be measured Is it measured in terms of . mils degrees millimeters of offset arcseconds radians When should the alignment be measured . when the machines are off-line or when they are running In more precise terms shaft misalignment is the deviation of relative shaft position from a collinear axis of rotation measured at the points of power transmission when equipment is running at normal operating conditions. To better understand this definition let s dissect each part of this statement to clearly illustrate what s involved. The deviation of relative shaft position accounts for the measured difference between the actual centerline of rotation of one shaft and the projected centerline of rotation of the other shaft. Figure 1. Typical misalignment condition. Figure 1 shows a typical misalignment situation on a motor and a pump. For a flexible coupling to accept both parallel and angular misalignment there must be at least two points where the coupling can flex or give to accommodate the misalignment condition. By projecting the axis of rotation of the motor shaft toward the pump shaft and conversely the .

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