Independent Rotation Heavy Drifter OBSOLETE DRILL – FEW PARTS AVAILABLE
PR123 Drills can be mounted on light Screw Feed Aluminum Guide Shells for underground long-hole drilling, and have an open boss ring to accommodate the feed nut for the screw feed in the aluminum shell.
PR123 Drill cylinders include a solid boss suited to mounting the drills on bolt-down slab backs for use on steel channel Chain Feed Masts for air track drilling.
PR123 Drills feature independent percussion and rotating actions. Rotation is provided by a strong efficient, reversible gear motor in the back-end of the drill. The rotation is transmitted to the geared chuck driver by means of a exterior drive shaft, which absorbs any rotational shock between the drill shank and the rotation motor. The piston hammer of the PR123 Drills and the rotation motor are operated as independent units. Optimum control of drilling can be provided by independently varying the air volume to the rotation and/or the percussion when drilling in extremely hard or soft rock. GD PR123
Gardner Denver – Drill Statistics
|Rotation||Rifle Bar||Rifle Bar||Rifle Bar||Rifle Bar||Indpendent|
|Bore||3.5 in||4.0 in||4.5 in||4.5 in||4.5 in|
|Length||29.5 in||32 in||30.5 in||31.0 in||38.5 in|
|Weight||150 lb||159 lb||203 lb||172 lb||290 lb|
|Air Hose||1.0 in ID||1.0 in ID||1.25 in ID||1.25 in ID||1.5 in ID|
|Water Hose||0.5 in ID||0.5 in ID||0.75 in ID||0.75 in ID||1.0 in ID|
|Drill Steel||1.0 in – 1.25 in||1.25 in||1.25 in||1.25 in – 1.5 in||1.5 in|
|Bit Size||1.5 in – 2.0 in||1.75 in – 2.5 in||2.0 in – 2.5 in||2.0 in – 3.0 in||2.0 in – 4.0 in|