Operator’s instructions
8. Options
85
Figure: ROC-ANGIE
What is aiming?
If it were possible to align the drill rig in the same direction for each new hole it
would not be necessary to aim ROC-ANGIE. For the drill operator to be able to
adjust the forward/rearward and left/right angle in exactly the same way at all holes is
however difficult, even with a compass and especially on the top face of the stope.
The solution to this problem is simple. Instead of aiming the entire drill rig in a spe-
cial direction at each hole, ROC-ANGIE can be turned round a vertical axis and
aligned in the desired direction.
Is a compass needed? Not if you can find an object at a distance of a hundred metres
to use as an aiming point. You can use a tree, a telegraph pole or similar. The further
away it is the better.
If you cannot find an aiming point you can use a compass or make your own aiming
point with a pole or the like. If you use a compass, remember that the steel in the drill
rig can affect the compass needle.
It is extremely important to aim ROC-ANGIE in the blasting direction or parallel
with the direction of the drill hole. If ROC-ANGIE is aimed, the angles shown in the
receiver are always relative to the aiming point, not to the drill rig.
3:1 = 18,4º
4:1 = 14,0º
5:1 = 11,3º
6:1 = 9,4º
7:1 = 8,1º
8:1 = 7,1º
9:1 = 6,3º
10:1 = 5,7º
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