Matching the carbide button to the job requirements is essential in achieving the desired results. Each of the following buttons is ideal for different ground conditions, abrasion levels, PSIs and penetration levels. In general, the larger the number of gauge buttons the better overall performance, especially in hard rocks.
domed/spherical button | Height 0.5 Ø Application -multipurpose - Best suited to hard ground
25,000 to 45,000 PSI (170 to 300 MPa) Abrasive to very abrasive
| domed/spherical buttons are usually used as gauge buttons of DTH bits, suitable for very abrasive and very hard rock formations.
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parabolic/semi ballistic button | Height 0.6 Ø Application Strength - fast penetration Best suited to medium ground 15,000 to 25,000 PSI (100 to 170 MPa) Mildly abrasive ground
| parabolic/semi ballistic buttons are usually used as gauge buttons and front buttons of DTH bits, suitable for medium abrasive and hard rock formations. |
ballistic button
| Height 0.75 Ø Application Strength - fast penetration Best suited to soft ground 10,000 to 20,000 PSI (70 to 140 MPa) Non abrasive ground
| ballistic buttons are usually used as front buttons of DTH bits, suitable for medium abrasive and medium hard rock formations. They also can be used as the gauge buttons when the rock is soft. |
conical button
| Height 0.7 Ø Application – fast penetration Suited for non-abrasive ground types Smaller contact area Best suited for smaller diameter bits
| conical buttons are usually used as front buttons of DTH bits for soft formations where fast penetration rates are possible and button breakage is minimal. |
