CROWN PROFILES | |
Extended channel flushing *Standard profile-general purpose design *Suitable for mixed formations containing broken and competent zones *Suitable for a broad range of formations | |
Jet *High performance “free cutting”bit *High productivity *Suitable for hard/competent formations | |
Face discharge *Designed to minimize flushing of core sample *Suitable for broken/granular formations | |
Wheel gear *Speed performance *High productivity *Suitable for hard/competent formations | |
Ball *Suitable for mixed formations containing broken and competent zones *Suitable for a broad range of formations |
CROWN HEIGHT | |
Short depth holes | 7mm |
Short to medium depth holes | 10mm |
Deep holes | 14mm |
FEATURES&BENEFITS |
* Less sensitive to abuse for high sustainability and cost efficiency |
* Matrices for a wide range of formations, easy bit selection |
* Standardized design makes the bit range competitive and cost effective |
STANDARD SPECIFICATION | |||||||
ITEM | DIAMOND BIT | REAMING SHELL | |||||
Swedish Metric T2 Series | Size | Bit-set OD | Bit-set ID | ||||
mm | inch | mm | inch | mm | inch | ||
36 | 36.0 | 1.417 | 22.0 | 0.866 | 36.3 | 1.429 | |
46 | 46.0 | 1.811 | 32.0 | 1.260 | 46.3 | 1.823 | |
56 | 56.0 | 2.205 | 42.0 | 1.654 | 56.3 | 2.217 | |
66 | 66.0 | 2.598 | 52.0 | 2.047 | 66.3 | 2.610 | |
76 | 76.0 | 2.992 | 62.0 | 2.441 | 76.3 | 3.004 | |
86 | 86.0 | 3.386 | 72.0 | 2.835 | 86.3 | 3.398 | |
101 | 101.0 | 3.976 | 84.0 | 3.307 | 101.3 | 3.988 | |
Swedish T Series | TAW | 47.6 | 1.875 | 23.2 | 1.31 | 48.0 | 1.89 |
TBW | 59.5 | 2.345 | 44.9 | 1.77 | 59.9 | 2.36 | |
TNW | 75.3 | 2.965 | 60.5 | 2.38 | 75.7 | 2.98 |
APPLICATION | |
Application 1 | Soft to medium hard rock with abrasive and fractured to competent formations Matrix series 1-4 |
Application 2 | Medium hard to hard rock with slightly abrasive and slightly broken to competent formations Matrix series 5-8 |
Application 3 | Hard to very hard rock with competent formations Matrix series 9-10 |
MATRIX SERIES | ||
Rock Group | Formation Description | Rock Type |
1-4 | Soft to medium hard Very abrasive to slightly abrasive Very fractured to slightly broken | Unmetamorphosed or weakly metamorphosed shales, Sandstone and limestone |
5 | Medium hard Abrasive Moderately fractured to slightly broken | Limestone and dolomite. Weathered granite and gneiss. Serpentinite and metaperidotite. |
6 | Medium hard Moderately abrasive Moderately fractured to slightly broken | Unmetamorphosed or weakly metamorphosed diorite, Gabbro, peridotite and gneiss. Basalt, andesite. |
7 | Medium hard - hard Moderately abrasive Slightly fractured to competent | Metabasalt, amphibolite. Metamorphosed diorite and gabbro. Diabase. |
8 | Hard Slightly abrasive Competent | Quartz rich skarn. Granite and pegmatite |
9 | Very hard Slightly abrasive Very competent | Metamorphosed granitic rock and quartz rich gneiss. |
10 | Extremely hard Non-abrasive, fine grained Very competent | Chert and jasperite. Quartzite. Highly metamorphosed volcanic. |
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