ROCK TOOLS
Apr-2021 Update RT11-E-1
A COMPLETELY BALANCED DRILLING SYSTEM FOR OVERBURDEN DRILLING

SUPER MAXBITThe SUPER MAXBIT gives stability whendrilling collapsing overburden formations.

SUPER MAXBITThe SUPER MAXBIT gives stability when drilling collapsing overburden formations.
This is an advanced technology compared to the other eccentric drilling methods. It consists of two to three wings
connected to the Down The Hole Hammer. The bit wings can be opened/retracted in forward/backward rotation.
Drilling and casing installation are possible simultaneously with the use of a casing shoe.
The SUPER MAXBIT has a following advantages:
a High-speed drilling similar to a standard DTH bit.
a Straight hole drilling.
a Uniform rotation while drilling of boulders, sand and gravel.
a Reliability of extending and retracting proven by customer experiences.

MECHANISM

OpenClose

Forward

ReverseBit Gauge(Retracted)

Casing I. D.
Casing I. D.

Bit Gauge(Extended)
Bit Gauge(Extended)

Bit Gauge(Retracted)

Casing O. D.

Casing Pipe

Casing O. D.

DTH Hammer

DeviceCasing Shoe
Bit Wings

Close(Retraction)

Open(Drilling)

COMPONENTS
Casing Shoe

PinBit Wings
2pcs for two wing type( 3pcsfor three wing type)
Device* Pin is attached with rubber plug.
* Retainer ring and rubber plug are not attached under 4" bit.
* Please be careful not to get your finger snapped when assembling.

1

OTHERSy Rotation Speed of Bit

y Setting Compressor

Target external rotation speed to 15-20m/min.
Refer to the following figure for rotation.
Select the range of uniform rotation during drilling.

• Set between 0.7 to 1.0MPa (100-150psi)• Consider the depth of underground water when drillingthrough the layer.
(In case of 30m (90ft) depth, add 0.3MPa (45psi) to theair pressure.)• Do not set over 1.5MPa (225psi)

Rotation Speed

100Rotation Speed (rpm)a Pressure80

a Air Consumption• Set the air supply
using the following formula.

60
40

Q=

20
04

8

12

16
20
Nominal Size (in.)

24

28

V(D2 –d2)
1273500

Recommended Air Consumption
Nominal Size(in.)
48121620
24
28
32

Air Supply(m 3/min)
(cfm)
4-15
140-530
19-26
670-92033-45
1,170-1,590
42-571,480-2,010
59-80
2,080-2,830
72-98
2,540-3,460
81-1112,860-3,920
90-122
3,180-4,310

Q : Air supply (m3/min)
D : Inside diameter of casing (mm)d : Outside diameter of jacket or hammer (mm)V : Air speed 1,100-1,500 (m/min)

32

y Exchange of components is necessary
a Wingsa Device

1. When the wear detection mark on a wing disappears.
2. When the carbide wear is excessive.
3. When wing body wears and carbides pop out.
WearDetection
MarkWhen the wear detection marks on the device enddisappear.
WearDetection
MarkWearDetection
MarkWearDetection
Marka Pin

When the wear attains the following value.
Please exchange the pin if you observe excessive wear.
Two Wing Type

Amount of Wear (mm)Three Wing Type

0.5-1.0

0.5-1.0

Amount of Wear (mm)Amount of Wear (mm)Geometry

APPLICATIONSThe SUPER MAXBIT is designed for drilling in gravel, clay, sand mixture, boulders and easy collapsing overburden.
The system is applicable for the various intentions with the combination of appropriate rig and drill.

PilingAfter casing through the collapsing overburden,insert a H-steel, then pull up the casing.

Water Well

Drilling water wells down to 50-250m in depth.

Pipe Roof, Water Service
Water Remove,Anchoring

Foundation

Foundational construction of buildings and bridges
up to 32"(ø800) of casing diameter.

Geothermal, Oil Well

It achives excellent results for drilling oflong holes and hard formations using
the Down The Hole Hammer.
Top-Hammer applications are available.

2Surface drilling down to 50m in depth
for geothermal and oill well.

Fore Piling

For piling as a reinforced method oftunneling in collapsing overburden.TROUBLE SHOOTING
TroubleReasonSolution

Less hammering.

Air pressure is too low to work.
(The hole is too deep that causes
shortage of air pressure)Compressor should be replaced with a bigger one, or install one
more compressor and air receiver tank.

Just drilling through clay formation.

The frequent hole cleaning is necessary.

Drive sub is loosen.(in the thread)

Rotate in forward direction may screw down.
Pull up casing pipe and screw down, the drill strings with thedriver sub properly.

Sand or clay infiltrating into the hammer.

Wipe off sand or clay inside the hammer.

Cutting are remainning between driver
sub and bit wing.

Flushing out cuttings enough.

Cutting are sticking in bit blow hole.

Flushing frequently.

Drilling through fractured zone.

The bit should be operated with lower feed pressure.

Hit a scrap iron.

Pull up the drill strings, and remove a scrap iron by casing arotary bit.
After that,start drilling with SUPER MAXBIT.

The bottom of the hole is filled withcuttings.

Water inside the casing pipe, and cuttings should be flushed outeasily.

Machine torque is too low.

Machine should be replaced with a bigger one.

Sticking through cave zone.

Pull up the drill strings and casing pipe about 20-30cm, thenscrew down slowly with hammering.

Less air compresor or air volume.

Compresor should be repraced with a bigger one or install one
more compresor and air receiver tank.

Just drillings through clay formation.

The frequent hole cleaning is necessary.

Cutting are staying inside the casing
pipe.

Water inside the casing pipe and cutting should be flushed out
easily.

Drilling through cracky formation thatleaks out air so much.

Water inside the casing pipe and cutting should be flushed outeasily.

Air leaking from slited casing pipe.

Before drilling, plugging up the slit of casing pipe by using tape.

Breakage of the weld joint.

Weld carefully so that the weld on the inside of the casing pipe.
Check the casing pipe is vertical and is linear.
Check that each weld is straigh and smooth so that the friction
between the casing pipe and hole wall is minimam.

Breakage of the thread joint.

Never use threaded joint casing pipe in deep hole.
(more than 20m)

Knocking on the side pin by hammering
while the bit is not on the bottom.

Keep the bit wings on the bottom of the hole.

Hammering in sand formation.

Feed and air pressure must be carefully watched to keep theface at the bit wing.

The bit wings is not on the bottom of thehole.

Keep the bit wings on the bottom with higher feed pressure.

Clay or mud has instruded into the holeof the device.

Clean the holes of the device.

Ground condition is too sticky to open.

Pull up the bit, (you should throw some small gravel.) and put
small amount of gravel into the hole to get some friction which isneeded for extension.

The bit wings is not on the bottom of thehole.

Keep the bit wings on the bottom with higher feed pressure.

Cutting are sticking around the bit wings
so much.

Flushing out cuting enough.

The thickness of the weld inside of thecasing pipes exceeds limitation.
(>0.5mm=1/64")

Pull up the drill strings slowly withforward slow rotation carefully.
Please do not hurry to pull up, because
the overweld of casing tubes can beground off by the device shoulder. So it
may take a long time to do so.

There is a concave on the outside of thecasing pipes which has broken during
drilling.

In water well drilling, sometimes rockor gravel will be pushed into slots of
straner that will cause a concave on
the casing pipes. So carefull
operations are necessary.

The bit does not
rotate at all.

Cutting are notflushed out of
the hole well.

Casing pipes
are not driven
down.

Breakage ofthe pin.

The bit wings
does not open.

The bit wings
does not close.

The drill strings
can not bepulled out.

3

WeldingCashing pipeGravel

Casing Shoe

TypeTwoWing

ThreeWingExtended
D1

Casing Pipe

Applicable Casing Pipe

Bit Gauge
Retracted

D2Casing O. D.

D3
Casing I. D.

D4
DeviceD1
Bit Gauge (Extended)

APPROPRIATE CASING AND HAMMER SIZE

Max. O.D. Min. I.D. Nominal
D2
D3
Size

DeviceO. D.
D4

Hammer
Size

mm

in.

mm

in.

mm

mm

in.

mm

in.

90

a

125

4.92

91

3.58

114.3

102.3

4"

923"

115

a

152

5.98

114

4.49

141.3

126.6

5"

1154"

140a

185

7.28

140

5.51

165.2

153.2

6"

1415"

165a215

8.46

166

6.54

190.7

178.7

7"

1676"

187

a237

9.33

1867.32

216.3

202.3

8"

187

6"

215

a

a

272

10.71

217

8.54

254.0

241.0

9"

218

8"

240

a

290

11.42

232

9.13

273.1

254.5

10"

240

8"

280

a

340

13.39

281

11.06

318.5

301.7

12"

283

10"

315

a

373

14.69

314

12.36

355.6

336.6

14"

316

12"

365

a

425

16.73

363

14.29

406.4

387.4

16"

365

12"

410

a

478

18.82

412

16.22

457.2

435.0

18"

414

15"

460

a

530

20.87

461

18.15

508.0

482.6

20"

463

15"
18"

510

a

580

22.83

509

20.04

558.8

533.4

22"

511

15"
18"

560

a

63024.80

559

22.01

609.6

584.2

24"

56118"

600a685

26.97

600

23.62

660.4

631.8

26"

60320"* When ordering, information about casing diameters* 2* 3* 4* 5*1*1 : Water Well
*2 : Piling, Foundation*3 : Pipe Roof, Water Service, Water Remove, Anchoring*4 : Geothermal, Oil Well
*5 : Fore Piling(O.D. and I.D.) is necessary.
Ordermade bits can be manufactured upon request.
*4

MMC HARTMETALL GMBH (Germany)

MITSUBISHI MATERIALS TRADINGCORPORATIONSEOUL BRANCH (South Korea)

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Apr-2021 Update

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2021.4.E(1A)