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• The hydraulic system should provide a flow of 7-9
gpm/26-34 lpm at an operating pressure of 2000 psi/140
bar. Recommended relief valve setting is 2100-2250
psi/145-155 bar.
• The system should have no more than 250 psi/17 bar
backpressure measured at the tool end of the operating
hoses. The system conditions for measurement are at
maximum fluid viscosity of 400 ssu/82 centistokes
(minimum operating temperatures).
• The hydraulic system should have enough heat
rejection capacity to limit the maximum oil temperature
to 140°F/60°C at the maximum expected ambient
temperature.
• The hydraulic system should have a minimum of 25
micron filtration. Stanley recommends using filter
The SK58 Sinker Drill is designed to be used to drill
holes in rock such as blast holes.
A rock bit containing carbides is attached to drill steel
which is inserted into the tool. The tool incorporates a
reciprocating piston and a varible speed hydraulic
motor. During the drilling process, the piston hammers
on the drill steel and the hydraulic motor rotates the drill
steel. It is the pounding and rotating motion of the rock
bit that causes the rock to fracture into small cuttings.
It is necessary to extract the rock shavings during the
drilling process. If the rock shavings are not extracted,
the rock bit will sit on top of the shavings, which in
turn, will prevent the rock bit from penetrating into the
rock.
On SK58110, SK58120, and SK58310 models, air is
introduced into the drill steel via a valve in the tool to
blow the rock cuttings out of the hole. On the SK58130
model, water is used to flush out the rock cuttings.
The air requirements for effective drilling are 30 cfm at
120 psi. The air supply is furnished by an air compres-
sor.
SK58 Sinker Drills are designed to be operated and
controlled by one individual. The rotation speed of the
drill steel and amount of air introduced into the drill
steel is adjusted by the operator based on an experience
HYDRAULIC SYSTEM REQUIREMENTS
elements sized for a flow of at least 30 gpm/114 lpm for
cold temperature startup and maximum dirt holding
capacity.
• The hydraulic fluid used should have a viscosity
between 100 and 400 ssu/20 and 82 centistokes at the
maximum and minimum expected operating tempera-
tures. Petroleum base hydraulic fluids with antiwear
properties and a viscosity index over 140 ssu/28
centistokes will meet the recommended requirements
over a wide range of operating temperatures.
• The recommended hose size is .500 inch/12 mm I.D.
up to 50 ft/15 m long and .625 inch/16 mm I.D. mini-
mum up to 100 ft/30 m long.
• Quick disconnect couplings must conform to NFPA
T3.20,15/EHTMA specifications.
PRINCIPLE OF OPERATION
factor for the particular application. Incorrect rotation
speed and/or inadequate extraction of the rock cuttings
will significantly reduce drilling effectiveness and result
in substantially increased drilling time.
The tool can drill up to a 3 in./75 mm hole up to 20 feet/
6 meters deep in rock. The tool has been used for other
applications such as dowel drilling and gas leak detec-
tion.
Because the tool has been specifically designed to be
operated by an individual, it should never be mounted to
and operated from a machine such as a drilling rig or
small excavator. If a requirement exists to machine
mount the tool, the application must first be approved by
Stanley Engineering. Failure to obtain this approval can
result in tool failure and void the warranty.
See the "OPERATING INSTRUCTIONS" section of this
manual for specific operating instructions.
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