concepts of shaft alignment offset and angularity in shaft alignment the shaft of the driven machine is typically considered stationary while the other the shaft of the driver is movable the movable shaft is adjusted in relation to the stationary shaft to bring both shafts into alignment and to satisfy Machinery alignment tolerances in this video we will be alternating between 3D View and graphical view in graphical view the horizontal length of each Square represents 20 mm while the vertical length of each Square represents 0. 1 mm while we'll be only working in the vertical plane the same Concepts also apply to the horizontal plane before we start let's measure and indicate in our graph view the positions of the front and back feet of the state machine the center of the coupling and the front and back feet of the movable machine beginning with our shafts in perfect alignment let's introduce some offset misalignment by raising the front and back feet of the movable machine equally by 0. 4 mm the movable Shaft Center Line is now offset from the stationary Shaft Center Line by 0.
4 mm at every point along its length because we added the same amount to both the front and the back feet the shafts are parallel there is no angular misalignment so our offset misalignment is 0. 4 mm and our angularity is 0. 0 mm in our next example we will induce both offset and angular misalignment by raising only the back feet by 0.
4 mm while leaving the front feet where they are now the movable Shaft Center Line is sitting 0 4 mm high at the back feet while sitting at 0 mm of offset at the front feet so what is our angularity in Geometry this concept is called slope or rise over run angularity or slope expresses the amount of rise or fall of the movable shaft over each unit of measurement along the shaft's length angularity is expressed as millim by 100 mm from the graph we can see that the shaft Rises 0. 4 mm between the front and back feet of the motor the distance between the front and back ft of the motor is 10 blocks across or 200 mm divide the rise of 0. 4 mm by the Run of 200 mm to get the angularity which is 0.
2 mm by 100 mm now what about the offset as you can see from the graph the offset is now a different different amount at every point along the shaft center lines you might ask why is the offset expressed as a single number it is because there is a standard reference point for offset misalignment here at the plane of power transmission typically at the center of the coupling the graph shows the offset is 0. 4 mm at the back feet and 0 mm at the front feet we know that the offset changes by 0. 2 mm for every 100 mm we move along the shaft the coupling Center is 80 mm from the front feet over those 80 mm the movable shaft will drop an additional 0.
16 mm 80 mm * 0. 2 mm therefore the offset at the coupling Center is minus 0. 16 mm in this example the movable shaft is sitting low at the coupling but high at the rear feet since we indu the angular misalignment by adding 0.
4 mm to the rear feet the only way to correct the misalignment is by removing 0. 4 mm to lower the rear feet please visit fixture laser.
