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Rod Pietsch

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NF Diamond Drill Bits Print E-mail

NF Diamond bits and reaming shells are used for mineral exploration, core sampling, large scale engineering, etc. Our products include surface-set and impregnated core bits, casing and rod shoes, reaming shells and PDC or polycrystalline bits.

Contact us for our competitive prices.

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NF Diamond Impregnated Bits are the most commonly used in the mineral exploration industry as they have the widest range of application. The carefully selected grades of high quality synthetic diamonds are distributed in the depths of the impregnated bit's matrix series. The matrix layer of the crown contains a uniform distribution of these crystals that are embedded in a powdered metal bond.

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NF Surface-set Diamond Bits are set with a singular layer of natural diamond utilizing a hard matrix compound on the face of the bit. The diamond set design ensures sufficient overlap to prevent premature wear of the matrix. Surface set bits achieve maximum results when used for drilling in soft and medium hard formations. It is a recognized practice to use larger set diamonds in the softer formations.

 

gearbit.gifSynthetic Diamond Gear Type Impregnated Core Bits are specially designed for drilling in very hard and slipped formation rock. If used in the correct rock type then the drilling speed is faster than with other bits designs. These bits can't be used in soft and high abrasive formation rocks. The matrix of these bits are marked A, B, C, D, E (from harder to softer).

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The NF Reaming Shell is set with natural diamonds or polystallines and is used to couple the drill bit with the core barrel. Its main function is to ream the hole to the correct constant specific diameter which ensures adequate clearance for the core barrel and sufficient clearance for the new bit which replaces an old one. It also acts as a stabilizer for the drill bit.

 

 

 

 Diamond Drill Bit Selection Guide

Semi-round

Drilling ediumm-hard and hard rocks, or a little broken and loose formations

Flat

For impregnated bit only, for drilling hard abrasive rocks

Bottom discharge design

Drilling sedimentary or metamorphic formations containing more powder mineral with high core recovery percentage, and no excessive core washout.

Stepped

Drilling medium-hard, broken or interbedded formations, preventing hole deviation

Serrate / V-ring

Drilling hard dense formations with high penetration rate

 

 

Diamond Concentration and Size

Rock Formation

Medium-hard

Medium-hard and hard

Very hard

Diamond Concentration

High

Medium

Low

Impregnated synthetic diamond size

>40mesh

46-60mesh

60-80mesh

80-100mesh

Surface set natural diamond size

15-25 SPC

25-40 SPC

40-60 SPC

60-100 SPC

 

 

Rock hardness (mohs)

Rock type

Formation characteristics

Matrix
type

Bit Selection

Black

Red

Blue

Green

Silver

4

Calcite, limestone, sandstone, shale, siltstone

Soft , Very abrasive , Highly fractured

NF1

         

NF2

       

5

Dolomitic limestone, norite granite, schist, serpentine

Medium soft, Abrasive , Medium to coarse grain

NF3

 

     

NF3*

     

NF4

 

   

6

Andesite, dacite, diabase, diorite, dolomite, hematite,  mica schist, peridotite, silicified schist, syenite

Medium hard, Moderately abrasive, Medium to fine grain

NF5*

   

NF5

     

NF6

       

7

Basalt, diorite, gabbro, garnet skarns, gneiss, granite, pegmatite, porphyry, quartzite, rhyolite, trachyte, silicified volcanics

Hard , Moderately abrasive, Fine grain

NF7*

       

NF7

   

 

 

NF8

     

 

8

Chert, jasperlite, quartzite, rhyolite, taconite

Hard, Non-abrasive, Fine grain

NF9*

     

NF9

     

NF10

     

9

Chert, ironstone, glassy quartzite, rhyolite, taconite

Very hard, Non-abrasive, Very fine grain

NF11*

       

NF11

       

NF12

       

* Very abrasive

 

Orders & Enquires

+61 427 084 371

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