4
Technical data
Maximum height of drill bit 650 mm
Maximum diameter of drill bit 178 mm
Minimum distance between buttons 3.5 mm
Output, spindle motor 3.00 kW
Output, table drive motor 0.25 kW
Output, cooling-fluid pump motor 0.44 kW
Voltage, working lights (40 W E27) 24 V
Air pressure, minimum 80 psi / 5,5 bar
Air pressure, maximum 101 psi / 7 bar
Air consumption 40 l/min
Speed, spindle (50 Hz) 14,900 r/min
Speed, spindle (60 Hz) 14,900 r/min
Speed, table (50 Hz) 22 r/min
Speed, table (60 Hz) 26 r/min
Capacity of cooling-fluid tank 22 l
Weight, exclusive of packaging 345 kg
Noise level during grinding* 96.5 dB(A)
Sound power level during grinding** 101 dB(A)
Vibration level during grinding*** < 2.5 m/s2
Manufactured: Epiroc Drilling Tools AB, Fagersta, Sweden
* Equivalent continuous A-weighted sound pressure level meas
-
ured at operator’s ear level during grinding. Possible spread due
to measuring method and production factors: 3 dB(A).
** Sound power level established in accordance with SS/ISO 3741.
Possible spread due to measuring method and production factors:
3 dB(A). Average value for frequency range 100-6300 Hz.
*** Vibration measurement according to EN/ISO 8662.
Accessories included
Description Product No�
Goggles 87001967
Puller 87005058
Wrench, 15 mm 87001439
Allen key, 4 mm 87002413
Filter wrench 87004659
Centring cup, 11 mm 87001387
Centering wheel, 16mm 87004760
Rubber feets 87002417
Spare parts manual, printed matter no. 9866 0044 01b
General
The Secoroc BQ3-DTH grinding machine is designed to grind
cemented-carbide buttons and the surrounding body steel in the
same operation using a diamond-coated grinding wheel. The
machine has an automatic feeding device, which makes it simple
to use.
For grinding to be carried out, the machine must be fitted with a
grinding wheel, a centring cup, a bit holder and an indexing ring
to suit the bit that is to be ground.
Applications
The Secoroc BQ3-DTH is intended for grinding DTH, COPROD and
threaded button bits up to 178 mm in diameter.
Technical description
The Secoroc BQ3-DTH consists principally of the following com-
ponent assemblies:
• A driving plate that is rotated by an electric motor via a worm
gear.
• A grinding disc that is placed on the driving plate. When the cen
-
tring button on the feed lever is pressed, an air cushion is created
under the grinding disc to facilitate centring of the button that is
to be ground. When the centring button is released, the grinding
disc is locked in position by a vacuum.
• A main holder, with a bit holder in accordance with the used
shank size.
• A centring device that adopts the centre position automatically
when the centring button is pressed. The centring device is in its
lower position when centering the button.
• A spindle that is rotated by an electric motor via a drive belt.
• An automatic feeding system for advancing the grinding wheel
on to the button. Feeding is effected by a pneumatic cylinder, but
manual feed is also possible.
• A coolant tank with pump to circulate the flushing fluid used to
cool the cemented-carbide buttons and the grinding wheel. Flush
-
ing starts automatically when table rotation starts.
The button to be ground must first be centred directly under the
grinding wheel. Table rotation is then started and the profiled
grinding wheel fed down to the rotating drill bit. The centred
cemented-carbide button rotates inside the profiled groove in the
grinding wheel and is quickly restored to its shape.
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