One is the offset measured in the plane of the rim dial indicator (DIR).
Rim And Face Alignment Calculator Trial And ErrorMany different variations of the rim-face method are used, including straight edge and feeler gauge methods, single dial rim-face, two dial rim-face, trial and error rim-face, etc.Rim And Face Alignment Calculator How To Accurately DetermineIn this training, we will focus on two dial rim-face alignment and how to accurately determine shaft positions using calculation and graphing procedures.
Selection and use of a commercial package designed to accommodate a variety of shaft diameters is recommended. The fixtures should include an assortment of rods to span various coupling lengths. Also, sag values can be pre-determined for the standard rod assortment. In these cases, rim-face alignment can be performed with the shafts coupled. ![]() If the face dial contacts the coupling face directly, ensure that the plunger of indicator contacts the coupling near its outer edge. For most alignment tasks, it is desirable to obtain and document a complete set of as-found readings along with the A, B, and C dimensions. Note that DIF stands for D ial I ndicator on the F ace and DIR stands for D ial I ndicator on the R im. For this training, all clock positions are referenced from the viewpoint shown belowstanding behind the movable machine facing the stationary machine. The information presented here applies to a Rim-Face dial setup presented earlier in the Unit. The equations presented are used to calculate the position of the movable machines front and rear feet from DIR offset value and the shaft angularity as determined from the face dial indicator (DIF). As presented in Section 3.2.7.3, correcting misalignment in the horizontal plane may be accomplished without calculating or graphing the exact front and rear feet positions. The front feet are 26 mils (0.66 mm) too high; shims need to be removed. The rear feet are 74.0 mils (1.88 mm) too high; shims need to be removed. A main advantage of graphing methods is that the shaft centerlines and misalignment conditions are represented visually. As presented earlier, misalignment in the horizontal plane may be accomplished without calculating or graphing the exact front and rear feet positions. It is helpful if this line is on top of one of the bold lines. Measure the distance from the stationary indicator plunger to the centerline of the rear feet of the movable machine. The largest horizontal scale will be the machine distance divided by the page width. For this example, the B and C dimensions both equal 10 inches.
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