Ingersoll Rand JH40 Jackhamer Especificaciones Del Producto página 8

EN
Drilling the Hole
7. Hold the jackhamer with both hands, spread feet apart, and apply a firm steady pressure.
8. The correct amount of pressure for maximum drilling efficiency can be gained only through
experience, but generally the correct pressure is usually recognizable by the rhythmic sound
of the exhaust and the free rotation of the steel.
9. Insufficient pressure will cause the jackhamer to bounce and may crack carbide inserts.
10. Too much pressure will slow down the jackhamer and may result in a stuck drill steel.
11. Keep the jackhamer, drill steel and hole aligned at all times.
Collaring the Hole
12. When starting the hole, hold the jackhamer firmly against the work and use a steel short
enough so that the jackhamer can be handled comfortably.
13. Open the throttle gradually and drill at half throttle or less.
14. Make sure the bit is through the overburden and about 2 inches (51 mm) deep in the rock
before using full throttle.
15. The jackhamer should be kept at right angles to the work, until the hole is collared, then
repositioned for angled drilling.
Cleaning the Hole
16. Always keep the hole clean and free of cuttings by blowing the hole frequently or using
plenty of water with wet machines. The bit must work on fresh rock. If the bit churns in its
own cuttings, drilling speed is reduced, and the possibility of a drill steel becoming stuck is
increased.
When the drill steel is not penetrating the rock freely, severe loads build up on the clutch
assembly causing overheating. This leads to major damage of these parts and early
breakdown.
Stuck Drill Steel
17. When drilling moist formations there is often a tendency for cuttings to pack in the hole
immediately behind the bit, forming a "mud collar. " Through action of the rotating bit, wet
cuttings pack solidly against the wall of the holes; and can cause a stuck drill steel.
To remove a stuck drill steel:
- Remove the jackhamer from the stuck drill steel and make an attempt to loosen the steel
with a wrench.
- Do not try to pull a stuck drill steel with the jackhamer for more than a few minutes. Heavy
thrust loads can damage front end parts.
To prevent a stuck drill steel:
- Blow the hole often.
- Keep the jackhamer working against fresh rock.
- Raise the bit from the bottom of the hole, and blow the hole clean before removing drill
steel and bit.
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CAUTION
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