My casing was not oriented correctly during installation. The A-grooves are misaligned about 10 degrees from the actual direction of movement. Is this a problem?

Answer: We refer to this as an orientation error, however, it is probably not a problem at all. In fact, you may find it to be an advantage. At 10 degrees, your A axis readings will capture 98.4% of the magnitude of the total movement, and movement seen in the B axis can be used to confirm that the A movement is real.

 This drawing shows a right triangle with sides A, B, and R, which represent the A-axis value, the B-axis value, and the resultant R, which represents the actual magnitude and direction of movement. The angle is the angle of misalignment (10 degrees in this drawing). The ratio between A and R is equal to the cosine of the angle. The cosine function works slowly, so even at 25 degrees of misalignment, the A-axis value contains 90% of R. The ratio between B and R is equal to the sine of the angle. The sine function works more rapidly. With a 10 degree misalignment of the A-axis, as shown in the drawing, the B-axis value will contain about 17% of the resultant. Thus any displacements seen in A should also be seen in B