6
General care
instructions
To ensure that your Grind Matic BQ3-DTH grinding machine func-
tions satisfactorily for a long time:
• Use original spare parts only.
• Read the maintenance instructions carefully before using the
machine.
• Make sure that the compressed air is always clean and dry.
• Check the water cooling function regularly.
• The incoming air and electricity supplies must always be discon
-
nected during installation, servicing and moving of the machine.
• If the machine is not going to be used for a long time, make sure
that it is lubricated and cleaned before being left idle.
Installation
• Always follow the safety instructions with regard to installa-
tion, operation and maintenance.
WARNING
There is a lifting eye on the upper part of the frame. Always make
use of the lifting eye when hoisting the machine into place. The
weight of the machine is normally 345 kg. Make sure valid lifting
equipment is used.
To be able to work, the machine needs electricity, compressed
air and water. Before start-up fill up the pump and filter cup with
water.
The feet underneath the machine must be adjusted so that runoff
water flows towards the drainage hole.
Electricity
• Electrical connection of the machine is restricted to quali-
fied electricians only.
• Check that the electrical data for the machine is compatible
with the mains voltage.
WARNING
On delivery, the machine is connected for the specified voltage
and frequency. A power cable is supplied with the machine.
A main circuit-breaker must be fitted between the power cable
and the electricity mains when the machine is installed. Always
observe local regulations in respect of electrical connection.
IMPORTANT
After connection: Check that the motors rotate in the right direc-
tion. The grinding wheel should rotate in the direction of the
arrow. If the grinding wheel rotates in the wrong direction, switch
the phases.
The machine is protected against overload. In the event of over
-
load, the motor overload protector will trip. Re-setting occurs
automatically after a period of standstill.
The machine is also equipped with an undervoltage circuit break
-
er and an emergency STOP device. In the event of undervoltage
or activation of the emergency STOP device, the system must be
re-set prior to re-starting.
Compressed air
The exhaust air from pneumatic components contains oil mist,
which can be bad for your health if inhaled. Always adjust the
lubricator so that the correct amount of lubrication is obtained.
• Before filling up with lubricating oil, ALWAYS switch off the
compressed air supply and vent the machine.
• The maximum permissible working air pressure for grinding
machines with pneumatic components is 7 bar.
CAUTION
The compressed air must be clean and free of water. The machine
is equipped with an air filter.
On the Grind Matic BQ3-DTH, compressed air performs the fol
-
lowing functions:
• It creates the vacuum that locks the grinding plate to the driver
plate
• It creates an air cushion under the grinding plate to make it eas
-
ily moveable during centring
• It provides a suitable grinding pressure.
• Operate the centring arm.
Cooling
The drill bit and grinding wheel are cooled with water mist. At
the bottom of the machine is a sedimentation tank for grinding
residue. If the machine is used every day, the sedimentation tank
must be cleaned at least once a week.
Cooling water is switched on automatically when the grinding
spindle starts to rotate. Then, when the grinding plate starts to
rotate, the coolant valve opens and cooling water starts to flow.
With the coolant nozzle, water is sprayed over the whole of the
grinding wheel.
Cooling is very important to the service life of the grinding wheel
and to the grinding result. If cooling is poor, thermal stresses can
be ground into the cemented carbide button, with subsequent
button breakage as a result. The service life of the grinding wheel
falls dramatically if cooling is poor.
A coolant mixture consisting of cooling concentrate and water
(mix ratio 1:30) should be used. Use the recommended cooling
concentrate. The concentrate contains a rust inhibitor.
Grinding plate
Before the grinding plate is put on, the contact surface must be
clean and preferably oiled as well. Check that the O-ring on the
driver plate is fitted.
Place the grinding plate carefully on to the driver plate. Turn on
the compressed air and check that the grinding plate “floats“
smoothly when the centring button on the feed lever is pressed.
In the beginning, the plate can bind a little. If so, move it around
for a few moments to alleviate the problem.
The air cushion can be regulated by means of a valve, located
next to the return pressure regulator. If there are great pressure
variations in the compressed-air supply, it may be necessary to
stabilize the pressure by means of an external pressure regulator.
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