core drilling bits Selection considerations carbide drill

Precision:
  Selection of carbide core drills bit, the first need to consider the size of the drilling accuracy. Generally, the smaller the aperture is processed, its tolerance is smaller. Therefore, the drill bit manufacturers usually be processed according to the nominal diameter of the hole size on theDrilling Tools classification. In the four types of carbide drill, solid carbide drill precision highest solid carbide tolerance range , so it is the best choice for machining precision holes; welded carbide drill or replaceable carbide drill crown tolerance range  hole machining is generally more suitable for accuracy requirements; installation carbide indexable insert drill is more suitable for heavy roughing, Although it is usually lower than the processing cost of several other bits, but the precision is relatively low, the tolerance range  , it is generally used for hole machining accuracy is not required , or by complete facelift boring blade finishing hole.