Geometry should follow the drilling conditions

DTH button-bit face and button shape affect how the bit contacts rock, maintains the hole and clears cuttings. There is no universal face design for every formation. Begin with the hammer and shank, then compare geometry for the actual rock and hole.

Information that changes the discussion

• Rock hardness, fracture and abrasiveness
• Homogeneous or mixed formation
• Hole diameter, depth and inclination
• Required hole straightness and gauge control
• Compressor and hammer operating range
• Water, dust and cuttings-removal conditions

Face profiles

Flat, convex and concave profiles are used for different combinations of penetration, stability, gauge support and formation response. Their suitability depends on the complete bit design and operating system, not the profile name alone.

Button profiles

Spherical, ballistic and other button shapes present different contact and wear characteristics. Hardness alone does not decide the choice; fracture, abrasiveness, impact energy and the desired balance between penetration and durability also matter.

Use wear feedback

When replacing an existing bit, send clear photos of face buttons, gauge buttons, flushing holes, shank and any uneven wear. Add drilling hours or footage and describe when penetration or stability changed. This is more useful than sending only the old product name.