FACTORS AFFECTING PERFORMANCE DRILLING
a.Kekerasan
b.Kekuatan
c.Elastisitas
d.Plastisitas
e.Abrasivitas
f.Tekstur
g.Struktur geology
2. DRILABILITAS ROCK
Drilabilitas rock is an easy indicator of whether or not the drill bit to penetrate into the rock
Drilabilitas rocks can be obtained by multiplying the speed of drilling in granite and barre drilabilitas factors.
V = 31 P / d ^ 1.4
V = kec.pada barre granite, m / sec
P = rock drill out put power, kW
d = diameter of the drill hole, mm
3. GEOMETRIC DRILLING
Geometry includes drilling diameter, depth, and slope holes explosive
The larger the diameter the slower the speed drilling
Depth of the explosive in a hole, the friction between the drilling string with the larger hole walls, and energy loss due to drilling string length is also getting bigger. This will reduce performance drilling machine
Explosive slope Hole Drilling Performance Will Also Lose. this is caused by increased drilling time to get the desired angle.
and to the same high level, oblique hole will be more explosive than the hole in the explosive upright, so the completion of its drilling will take longer for oblique holes.
4. DRILL MACHINE AGE AND CONDITIONS
Performance of a device is determined by
-Management of equipment
-Working conditions
-Conditions tools
assess the condition of the tool:
willingness mechanical
ma = w / (w + r) x 100%
physical readiness
pa = (w + s) / (w + r + s) x 100%
percent use of willingness
ua = w / (w + s) x 100%
effective use
eu = w / (w + r + s) x 100%
5. SKILLED MACHINE OPERATOR BOR
Operator skills can be acquired from training and work experience, and it is often difficult to assess quantitatively but only based on the historical records of the performance of each operator and attitute.
Disciplinary problems are often used as an excuse by management in assessing the employees, but it can not be the main reason for the problem would be related to the overall working conditions
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A radial drill, by contrast, is mounted on a very large column - a foot or more in diameter even on tiny radial drills.
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