Operators Manual - Pentruder Modular Drilling system
20
Feed regulation using the hydraulic HD feed unit
The Pentruder drill system and Pentpak 15/25 are equiped with a semi-automatic control
which senses differences in type of concrete, the drill bits ability to cut the concrete in
question, and re-bars. A fairly constant power application is ensured by a special valve, which
senses the working pressure to the drill motor and regulates the feed motors until the system
is in balance and an even power application is achieved.
The maximum level of power application can be set to suit a certain condition or drill bit,
power supply etc., by adjusting the screw at the bottom right corner of the Pentpak 15/25.
Insert a 6 mm Allen key into the hole in the front panel to do this adjustment, unscrew to
decrease maximum working pressure, and tighten to increase. For wall sawsing, the screw is
normally set at ¾ turn out from bottom at the factory. This setting represents the correct
setting for achieving maximum performance with max output from the electric motor.
For drilling, turn the screw 4 – 5 turns out to start with, set the desired maximum penetration
speed with the potentiometer, and then adjust the allen screw on the power pack until the
desired working pressure is achieved.
Rapid traverse
When the Pentpak 15 is used together with the hydraulic feed unit a rapid traverse of about 1
m/minute along the column can be reached. When the Pentpak 25 is used together with the
hydraulic feed unit a rapid traverse of about 2 m/minute can be reached. When the
potentiometer (Remote control –”Potentiometer for feeding speed”) is turned clockwise to the
max, the feeding speed is at its highest. If the knob is, turn anti-clockwise the feeding
movement’s stops completely.
