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|Bearing Type:||Sealed Friction Bearing||Name:||Tungsten Carbide Insert Bit|
|Standard:||API-7-1, ISO 9001:2008||Series:||FSA|
|IADC:||517||G:||Reinforced Gauge Protection|
9 5/8" FSA517G, TCI Bit , Sealed Friction Bearing , Three Cone Roller Bit , Tricone Drill Bit
RECOMMENDED DRILLING PARAMETERS FOR APPLICATION
|Types & IADC Code||417||
|Lb/in. (Bit Dia.)||2285~5142||2285~5142||2000~5714||2857~5714||3428~6285||4000~6857|
|Rotation Speed (Rpm)||140~60||140~60||125~50||110~50||100~40||80~40|
The above chart represents commonly available sizes and types, we do produce other sizes and types of rock bits which do not appear on this list. Please contact us for more information.
ROLLER CONE BIT CONE DESIGN
In some formations, it is advantageous to design the cones and their configuration so that they do not rotate evenly but that they slip during rotation. This Cone slippage, as it is called, allows a rock bit to drill using a scraping action, as well as the normal grinding or crushing action.
Cone slippage can be designed into the bit in two ways. Since cones have two profiles: the inner and the outer cone profile, a cone removed from the bit and placed on a horizontal surface can take up two positions . It may either roll about the heel cone or the nose cone. When the cone is mounted on a journal it is forced to rotate around the centre of the bit. This “unnatural” turning motion forces the inner cone to scrape and the outer cone to gouge. Gouging and scraping help to break up the rock in a soft formation but are not so effective in harder formations, where teeth wear is excessive.