Selection of carbide drill bit considerations

use carbide drill, the first need to consider the size of precision drilling. In general, the smaller the aperture to be processed, its tolerance is smaller. Therefore, manufacturers usually arix core drill bit holes to be processed according to the nominal diameter of the drill bit for classification. In the above four types of carbide drill, solid carbide drill highest precision (φ10mm solid carbide drills tolerance for 0 ~ 0.03mm), so it is the best choice for high-precision machining holes; welded carbide drill or replaceable carbide drill crown tolerance range is 0 ~ 0.07mm, generally more suitable for hole machining accuracy requirements; installation carbide indexable insert carbide drill bits are more suitable for heavy roughing, Although its processing cost is typically lower than the other several bits, but its precision is relatively low, the tolerance range is 0 ~ 0.3mm (depending on the bit aspect ratio), it is generally used for hole machining accuracy is not required , or require subsequent finishing hole.