Use of the Stemalign™

Stemalign uses a beam of light to obtain the exact angle and direction. Simple in concept and easy to use, Stemalign can provide the most accurate measures in angle and direction immediately using simple tools.
To use, start by lowering a flashlight tied to a string or measuring tape into the borehole. Next, set up a baseline by tightly drawing a string across the rims of a row of boreholes. Normally this baseline is parallel to the free face.

Borehole Inclination / Angle

Inclination readings are the angle from the vertical. To measure inclination using Stemalign:
•Hold Stemalign vertically over the borehole with the level on the left side
•Center the bubble and move so that you can see the beam of light on the vertical cross hair
•Where the beam of light intersects the vertical cross hair is the inclination of the
borehole.

 

 

Borehole Direction
Direction readings are taken relative to the baseline set. The direction readings are the angle (right or left) from the baseline. To measure direction using Stemalign:
• Hold Stemalign telescop fashion and sight down the borehole directly at the flashlight
• Rotate Stemalign until the bubble level is at the bottom of the display and the bubble is centered
• Find the image of your baseline (string) on one of the sectors which are marked 0 to 30 degrees located on the right or left of the viewing area.
The actual direction of the borehole is aligned with the vertical cross hair on the display. The image of the baseline shows the angle of deviation of the hole. If the borehole was drilled correctly, the vertical cross hair would be perpendicular to the
baseline.