When we align equipment, we are aligning the rotational centerlines of the shafts. We have a stationary machine and a moveable machine. In most cases the stationary machine’s center of rotation is the target and reference for all measurements and corrections of the movable machine.
When reading laser or dial indicator values, the terms of “Positive” or “Negative” are used to describe the position of the movable machine relative to the reference centerline. When we move a machine that is mounted in a horizontal position, such as a pump and motor, we reposition the movable machine by moving in only two planes, vertical and horizontal.
In the vertical plane, positive refers to above the reference centerline, and negative refers to below the centerline. When viewing the horizontal plane, typically from the driver point of view, positive is to the right of the reference centerline and negative to the left of centerline. This is the case regardless of the Fixturlaser tool you are using. The graph below could be viewed two ways. It could be viewed as representing the vertical position (as viewed from the side) or the horizontal position (as viewed from above).
If you are using the NXA or XA laser system from Fixturlaser the visuals you see on the results and live screens are an actual representation of the movable machine’s position. Vertical and horizontal angularity and offset are clearly shown as are the feet position.
The pictures below are of the NXA Pro or Ultimate. Position of the movable machine vs. the reference machine will be easy to see because of this accurate depiction illustrated on the interactive user interface. When using any of the Fixturlaser Alignment tools the right/left or high/low vs. +/- reference will be the same as illustrated.
A few things to remember: