Brand New! Wolf VL-140 Drifter

    The VL-140 DRill is a 140mm bore, valveless, hammer drill that incorporates an independently controlled, gear type, air powered rotation motor to rotate the drill steel in place of the conventional rifle bar, rifle nut rotation.

    The VL-140 Drill is capable of drilling 2-1/2"  (64mm) to 4"  (102mm) diameter holes in all types of ground formations.  It is recommended for use on our "Crawlair" self-propelled mountings, and for surface applications with chain feed mountings on any type of fixed or mobile drilling rig.

    The VL-140 is a valveless tool.  An air distributor, controlled by an extension on the piston head, is used in place of conventional valve chest assembly.  This is a much simpler design, and therefore, reduces the number of parts and critical tolerances.

    A double blower tube construction is standard on the VL-140.  It includes a 9/16 in.  (14.3mm) O.D. Plastic blower tube within a 3/4 in.  (19mm) O.D. Steel tube support.  The standard chuck parts (jaw, aligner, and retainer) accomodate a four splined striking bar with 1-3/4"  (45mm) shank and stem diameters.

    The VL-140 drill is equipped with an independently controlled, air powered gear type rotation motor.  This heavy duty 3 hp motor is mounted on top of the drive gear cover at the lower end of the drill.  The rotation motor is independently controlled, and is designed to provide continuous drill steel rotation.  The operator controls the speed and direction of rotation (conventional forward [L.H.], Neutral [no rotation], or Reverse [R.H.] from a remote control manifold).

VL-140 Specifications
Weight of Drill (Net)	421 lb.  (191 kg)
Overall Length	44 in.  (1118 mm)
Bore of Cylinder	5-1/2 in.  (140 mm)
Working Stroke	3-5/8 in.  (92 mm)
Size of Main Air Inlet Hose Required	1-1/2 in.  (38 mm)
Size of Blower Hose Required	1 in.  (25 mm)
Rotation Motor
Size of Air House Required	1 in.  (25 mm)
Brake Horsepower	3 @ 90 psi  (3 @ 620 kPa)
Torque at Chuck (at stall & 90 psi [620 kPa] )	185 lb-ft.  (140 mm)
Rotation Speed at Chuck (norm. Oper. Speed)	100-150 rpm
Maximum Chuck Rotation	250 rpm
Shipping Information
Net Weight	421 lbs.  (191 kg)
Shipping Weight	451 lbs.  (205 kg)
Cu Contents	4-10 cu. ft.  (0.14 cu. m.)

    The total air consumption of the VL-140 consists of three parts.  They are:

1)  Drill
    This is the air required to reciprocate the piston.  It depends only on the pressure at the drill main air inlet.

2)  Blow
    This is the air passed through the drill steel to blow the chips out of the hole.  The amount consumed depends on the pressure at the blow inlet in the backhead and the number of the steels in the string.  In some instances, when drilling in hard uniform rock, the operator uses more blow air then necessary.  In such cases, improved drill performances can be obtained by throttling back the blow air to divert additional air to the hammer, so that the drill runs at higher pressure.

3)  Rotation
    This is the air requried to rotate the drill steel and bit.  The operator can control the power and air consumption of the rotation motor by controlling the pressure supplied to the motor.  If he runs the rotation wide open, the motor will run at maximum speed and air consumption.  If he throttles back on the pressure to the motor, it will run slower and consume less air.  The air conserved by throttling back the rotation air pressure will be diverted to the drill hammer and will improve drilling performance by increasing the operating air pressure.  The total amount of air used is, therefore, dependent upon several factors.  However, the following can be expected when using a 600 cfm  (17 cu/m min) compressor in good condition at sea level.

• 82 PSI at the drill inlet when running continuous rotation wide open as in overburden drilling.
• 90 PSI at the drill inlet when running continuous rotation throttled back as in average rock formations.

    A 750 cfm  (21.2 m³/min) air compressor must be used to maintain an air pressure of 100 PSI or more at the drill inlet, and in addition, provide the required volume of air for blow and rotation.

NOTE The air pressures indicated in above paragraphs are based on readings taken at sea level.  The pressures will be 2.5 PSI  (17 kPa) lower for every 1000 ft  (304m) altitude above sea level.

    An air compressor having a capacity for 750 cfm  (21.2 m³/min) is required to provide the necessary volume of air at the most efficient pressure for the VL-140 drill.


    Low or inadequate air pressure at the drill is costly and wasteful.. In addition, an insufficient volume of air at the drill will not allow the machine to operate in the most officient manner.

    An air pressure of 100 PSI is recommended for maximum performance of the VL-140 drill.  This figure represents the air pressure at the drill and not at the compressor.  There is always a certain amount of line drop between the compressor and the drill, and only the pressure and volume at the drill can be effective in doing work.  If hoses are short and in relatively good condition, pressure drop between the compressor (or air receiver) and point of use should not exceed 15 percent of the initial pressure.


    Quality hose designed especially for rock drill service should be used.  It should be constructed with an outer covering which resists abrasive wear; it should have an oil resistant inner tube; and must be designed to withstand the heat of the compressor's air.  The hose should be at least one size larger than the pipe thread on the drill.  It should have a working pressure safety factor of at least 4-to-1 in relation to burst.
   
    The hose fitting should be kept as tight as possible and should be in good condition.  Elimination of air leakage involves making the air system tight and then keeping it tight.  Air losses, through bad connections and worn hose, can often reach 10-20% of the total air compressed.


    The backhead is a compact steel unit with threaded inlet ports for the blower tube retainer and main air inlet connection.  The inlet connection is forged steel (90°) with screwed-in straight hose stem for a 1-1/2 in.  (38 mm) main air hose.  It is attached to the backhead by a cap and retaining ring so that it is free to swivel in the backhead.

    The VL-140 is a valveless drill: a simple air distributor (no moving parts) is installed in the rear bore of the cylinder in place of the valve chest assembly used in conventional drills.  The internal bore of the air distributor is fitted with a pressed-in replaceable bronze liner which relieves the distributor body of wear.  Ports in the air distributor body (and liner) direct the main operating air through the front and rear piston supply ports.  The intermitent flow of air through the front and rear main air supply ports is controlled by a piston extension that extends into the distributor body, and opens and closes the air supply ports as the piston reciprocates.  A long key is installed along the O.D. of the distributor body to align the ports in the distributor with the connecting ports in the cylinder. 
   
    The piston is designed with an integral piston extension that projects from the rear end of the piston head.  It extends into the bore of the air distributor when the drill is assembled, and, as the piston reciprocates, opens and closes the main air supply ports to the front and rear ends of the piston. 

    The piston bearing is designed with long bearing surfaces and with two pressed-in sleeves; one to take wear from the piston stem and one to take wear from the chuck.  The chuck is supported in both the fronthead and the counter bore in the piston stem bearing.  Gear teeth on the O.D. of the chuck mesh with chuck drive intermediate the gear to rotate the chuck smoothly.  The chuck engages the chuck jaw to transmit rotation to the shank piece.

    The rear end of the fronthead is counterbored to support the chuck drive intermediate gear shaft and the piston end of the motor drive gear.  The front end of the fronthead is equipped with a replaceable bronze fronthead bushing that takes all wear and prolongs the service life of the chuck and fronthead.

    The VL-140 is designed with an air powered, integral rotation motor which includes a motor drive gear, and an enclosed housing assembly consisting of an air motor manifold and a motor gear housing.  The motor drive gear and idler gear convert the operating air to rotation power.  The rotation power developed by the drive gear is transmitted through a drive gear shaft, which extends through the center bore of the drive gear, to the chuck drive intermediate gear.  The intermediate gear meshes with the chuck gear to transmit the motor rotation to the drill steel.

    The motor manifold encloses the rear end of the rotation motor, and includes two inlet ports for the forward and reverse control hoses.  The forward rotation port includes a metering plug to cut down the rotation motor air consumption, and therefore, allow a greater volume of air to be directed to the drill hammer to improve drilling performance.