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  • CARBIDE BURR SELECTION AND USE:

     

    The first step in selecting the proper burr is to pick the best shape and cut style.

  • Selection of shape and diameter should be based on the work piece, and the operation to be performed.
  • Burs have 13 basic shapes:
  • Burs come in 7 kinds of flute style as following.
  •   6 - Double Cut: Very efficient stock removal. Creates a small chip. Good finish. Excellent operator control.
      3 - Single Cut: General purpose fluting. Produces long chips.
      1 - Nonferrous: For nonferrous materials. Aggressive stock removal.
      3SP - SP Chip Breaker: Provides breakdown in chips. Better control.
      4 - Diamond Cut: For heat treated and tough alloy steels where control is important. Creates a powder-like chip. Excellent finish.
      2 - Coarse Cut: Provides large flute area for softer ferrous materials. Fast stock removal.
      5 -Fine Cut: For general use on hard materials requiring a fine finish.
  • Selection of cut would be based on the material, and finish required.
    Material   6   3   1   3SP   4   2   5
    Aluminum            
    Brass, Bronze Copper        
    Carbon Fiber          
    Fiberglass            
    Cast Iron        
    Plastics          
    Hard Rubber            
    Steel, 40-55 Rc    
    Steel, 55-60 Rc    
    Steel, Carbon        
    Steel, Nickel Chrome      
    Steel, Stainless      
    Steel, Weldments        
    Titanium        
    Zinc          
  • The second step in selecting the right tungsten carbide grade.

  • We have metric size and fractional size for industrial carbide burrs. Meanwhile, we have 3 kinds of different carbide grades named K30, K25, K20 for carbide burrs.
Grade Cobalt HRA HRC Density
(ISO 3369)
Transverse rupture strength (ISO 3327)
K30 8% 89.3-89.5 74.3-74.6 14.8 2000
K25 7% 89.5-90.5 74.6-77 14.9 2650
K20 6% 90.1-91.5 76.2-78.4 14.7- 15 1800
  • The third step in selecting the right rotary speed for SYNDENT carbide burr.

  • These are general speed recommendations that may need to be adjusted for special application
  • Material of work-
    piece
    RECOMMENDED ROTARY SPEEDr/min (Rotary speed = the below number x1000)
    Dia 3mm Dia 6mm Dia 8mm Dia 10mm Dia 12mm Dia 16mm Dia 20mm Dia 25mm
    Steel, cast steel Non-
    hardened,non-
    heat treated steels
    Aggressive grinding 60000-
    95000
    32000-
    48000
    24000-
    36000
    19000-
    29000
    16000-
    24000
    12000-
    18000
    10000-
    14000
    8000-
    11000
    Fine grinding 48000-
    64000
    24000-
    32000
    18000-
    24000
    14000-
    19000
    12000-
    16000
    9000-
    12000
    7000-
    1000
    6000-
    8000
    Hard non-ferrous metals Aggressive grinding 27000-
    37000
    13000-
    19000
    10000-
    14000
    8000-
    11000
    7000-
    9000
    5000-
    7000
    4000-
    6000
    3000-
    4000
    Fine grinding 37000-
    48000
    19000-
    24000
    14000-
    18000
    11000-
    14000
    9000-
    12000
    7000-
    9000
    6000-
    7000
    4000-
    6000
    Stainless steel (INOX) Rust and acid-resistant steels Aggressive grinding 32000-
    48000
    16000-
    24000
    12000-
    18000
    10000-
    14000
    8000-
    12000
    6000-
    9000
    5000-
    7000
    4000-
    6000
    Fine grinding 37000-
    48000
    19000-
    24000
    14000-
    18000
    11000-
    14000
    9000-
    12000
    7000-
    9000
    6000-
    7000
    4000-
    6000
    Aggressive grinding 32000-
    48000
    16000-
    24000
    12000-
    18000
    10000-
    14000
    8000-
    12000
    6000-
    9000
    5000-
    7000
    4000-
    6000
    Fine grinding 37000-
    53000
    19000-
    27000
    14000-
    20000
    11000-
    16000
    9000-
    13000
    7000-
    11000
    6000-
    8000
    4000-
    6000
    Cast iron Grey cast iron, white cast iron Aggressive grinding 60000-
    95000
    32000-
    48000
    24000-
    36000
    19000-
    29000
    16000-
    24000
    12000-
    18000
    10000-
    14000
    8000-
    11000
    middle grinding 48000-
    64000
    24000-
    32000
    18000-
    24000
    14000-
    19000
    12000-
    16000
    9000-
    12000
    7000-
    1000
    6000-
    8000
    Fine grinding 53000-
    64000
    27000-
    32000
    20000-
    24000
    16000-
    19000
    13000-
    16000
    10000-
    12000
    8000-
    10000
    6000-
    8000

 

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