Perhaps the most fundamental decision when selecting different carbide
configurations is profile shape. Button bits most commonly have either a hemispherical
or semi-ballistic carbide design; however it is not uncommon to use other carbide designs as well.
Shorter lifetime and susceptible to breaks : Conical Full Ballistic
Tungsten carbide life time. Semi Ballistic
Longer lifetime and less susceptible to breaks: Crown Point and Hemispherical
Flat Face Applications : Hard and abrasive formations, all round
Typical formations: Granite, hard limestone, basalt Convex Applications: Soft to medium hard rock, high penetration rate. Typical formations : Limestone, hard limestone, shale, granite, basalt Concave Applications: Medium hard to hard formations, less abrasive, fractured formations, excellent control over hole deviation Typical formations : Granite, basalt Concave Applications : Special design with ballistic front buttons, medium hard to hard formations, fractured formations. Typical formations :Granite, basalt
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