- Rotation Without Impact
- Impact Without Rotation
- Impact and Rotation
The piston hammer and the rotation motor are
operated as independent units. This allows a better control of
the drill in extremely hard or soft rock by varying both the rotation
and the percussion...light impact and fast rotation for soft
ground...heavier percussion and slower rotation for hard rock drilling.
An efficient hollow torsion bar is freely splined to
the gear motor and to the chuck driver. This torsion bar
transmits the rotation from the motor to the drill steel and also
absorbs any rotational shock between the shank and the rotation
motor. This hollow bar conducts air pressure to the inside of the
chuck end gear chamber; this pressure, in turn, keeps dirt out.
No Internal Rotation Parts
The following troublesome parts have been eliminated
from the design of the PR123J: rifle bar and nut; chuck driver nut;
rachet ring; pawls; pawl springs.
For exhaust noise control equipment.
The chuck driver, gears and gear motor are all
equipped with special bearings for efficient rotation and adequate
load-carrying characteristics. Included are ball bearings, solid
bronze bearings, and a thrust bearing. Each bearing has been
selected to give long service life in its special application.
The PR123J Drifter Drills is remotely controlled by
a bank of sliding spool valves; one valve for percussion, a graduated
three-phase (forward-off-reverse) valve for rotation, a blowing valve,
and a Pressure Regulated Feed Control valve. Finger tip selection
of any combination for all applications.
A Gardner-Denver line oiler in the airline provides
excellent lubrication to the rotation motor, the hammer, and the chuck
An extremely strong, efficient, long-wearing,
reversible gear motor supplies the rotation power for the PR123J Drill.
|Weight Less Mounting
|Air Hose Percussion Piston Hammer
Diameter (38 mm)
|Air Hose Rotation Motor
|Weight Boxed for Shipment
|13" x 15" x
330 x 381 x 1219 mm
|Feeds and Mountings
Aluminum Screw Feed
RMEA - Chain Feed
|Drill Rig Mountings
- Cylinder with plain ways and Top Exhaust Deflector
- 4-spline Chuck for 1-3/4" rd. x 3-13/16" Shank
- Bolted-on Chuck End Cap
- 9/16" dia. plastic Air Tube
- Wet-or-Dry Gland