Stemlock Stemalign™ is an optical device that provides quick and precise measured angles and direction of blast holes.
Stemalign uses a powerful LED light to obtain the exact angle and direction. 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:
Direction readings are taken relative to the baseline set. The direction readings are the angle (right or left) from the baseline. To measure direction:
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.