Wednesday, 15 November 2017

Classification Of Fixed-Cutter Bits

The classification system for fixed cutter bits (PDC & diamond bits) consists of four characters. 

The first character
  • describes the body material and it is either M for matrix body or S for steel body construction. 

The second digit
  • describes the cutter density
  • For PDC bits : ranges from 1 for soft formations to 4 for hard formation
    1 refers to 30 or fewer 1/2” cutters
    2 refers to 30 to 40 cutters
    3 indicates 40 to 50 cutters
    refers to 50 or more cutters.
  • For diamond bits : ranges from 6 for soft formations to 8 for hard formation
    6 refers to diamond sizes larger than 3 stones per carat
    7 refers to  3 stones to 7 stones per carat
    8 refers to sizes smaller than 7 stones per carat. 
  • Numerals 0, 5 and 9 are reserved for future use. 

The third digit 

  • describes the size or type of cutter. 
  • For PDC bits
    1 indicates cutter larger than 24 mm in diameter
    2 represent 14-24 mm,
    3 indicates 13.3 mm (1/2”), and
    4 is used for the smaller 8 mm in diameter. 
  • For diamond bits: the third digit represents diamond type
    1 indicating natural diamonds
    2 to TSP material
    3 represents mixed natural diamonds and TSP
    4 applies only to the highest density bit, indicating an impregnated diamond bit.

The fourth digit

  • gives the basic description of bit’s profile.
    1 represents both fishtail PDC bit and ‘flat’ TSP and natural diamond bits. 
    2 & 3 & 4 indicate increasingly longer bit profiles 

Classification Of Diamond Bits
Classification Of Diamond Bits

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