SmartROC D65 T4F 10 Options
187 No: 713944459.6 en
Down-the-hole rock drill
RC down-the-hole rock drills resemble normal down-the-hole rock drills, but they have a
hardened inner tube to guide up cuttings and flushing air. The inner tube is a wear part and
in most cases it is easily replaced through the upper part of the down-the-hole rock drill.
Guide
A guide, which is normally slightly smaller than the drill bit, stabilises the down-the-hole
rock drill and results in less hole deviation. It is primarily used in horizontal or inclined
holes.
The guide is mounted between the lowest drill pipe and the down-the-hole rock drill.
A mounted guide also makes it easier to work loose after jamming.
Drill pipe
Double tubes are used during RC drilling, one inside the other. The compressed air for the
down-the-hole rock drill is routed between the inner and the outer tube and then back, to-
gether with the cuttings, in the inner tube.
The outer tubes are threaded. The inner tubes are held in place in the outer tubes with
circlips. There are three O-rings in the lower end of the inner tube.
Normally, a 6 m long drill pipe with a diameter of 4" or 4-1/2" is used on the outer tube.
Because the RC pipes are heavier than normal drill pipes only 4 tubes may be loaded in
the carousel. The maximum number of tubes is then 4+1, that is, 4 tubes in the carousel
and 1 tube in the feeder.
Thread adapter
The thread on the air swivel is suitable for the Metzke 4" drill pipe. If another drill pipe is
used then a thread adapter is required.
Spar adapter
In order to protect the thread on the air swivel or thread adapter directly above, a short
spar adapter is used. It has the same type of thread at both ends.
Air swivel
The air swivel guides in the compressed air between the outer and the inner drill pipe.
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