ROLLING CUTTER BITS. Rolling Cutter Bits Steel Tooth (milled tooth) Carbide Tooth (tungsten carbide insert) Introduced in 1909 by Howard Hughes 2 - cone bit Not self-cleaning. Tungsten Carbide Insert Bit. Milled Tooth Bit. ROLLING CUTTER BITS.
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
(a) Milled tooth cutters
(b) Tungsten carbide insert cutters
Proper bottomhole cleaning is very important cutter Bits
Fluid flow through water courses in bit
Fluid flow through jets in the bit (nozzles) cutter Bits
Ball Bearings (point contact)
Roller Bearings (line contact)
Journal bearing (area contact)
Lubrication by drilling fluid . . . or . . .
Tooth wear or loss
Steel teeth - graded in eights of original tooth height that has worn away
e.g. T3 means that 3/8 of the original tooth height is worn away
e.g. T3 means that 3/8 of the inserts are broken or lost
Balled up Bit
Washed out Bit
Bit is either in-Gauge or out-of-Gauge
Measure wear on diameter (in inches), using a gauge ring