FLRT Steel Tooth Tricone Bit / MT Drill Bit 311.2mm FSA124 With Sealed Roller Bearing
311.2mm FSA124 , Rotary Drilling Bit , MT Bit , ST Bit , Tricone Bit , Sealed Roller Bearing
RECOMMENDED DRILLING PARAMETERS FOR APPLICATION
| Types & IADC Code |
114 115 |
124 125 |
134 135 |
214 215 |
244 245 |
324 325 |
|
| WOB | KN/mm(Bit Dia.) | 0.3~0.75 | 0.3~0.85 | 0.3~0.95 | 0.35~0.95 | 0.35~0.95 | 0.4~1.0 |
| Lb/in. (Bit Dia.) | 1712~4285 | 1715~4857 | 1715~5428 | 2000~5428 | 2000~5428 | 2285~5714 | |
| Rotation Speed (Rpm) | 200~80 | 200~80 | 180~80 | 180~80 | 180~60 | 150~60 | |
Design factors
- Bit design depend on formation properties and hole size
- Legs are same but cutters are different
- Three logs should be equally loaded
- The main design factors are Journal bearing, amount of offset,teeth, bearing and relationship between teeth and bearing
Roller-ball-friction (RBF)
- Friction type bearing at the nose
- The inner ball and outer roller as the same as RBR
- The friction consists of a special case-harden bushing pressed into the nose of the cone
- Introduced to overcome the shortcomings of RBR
- Allow thicker cone section
- Larger pin diameter
- Common for bit sizes up to 26"
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