2.1 spiral groove: For discharging chips and set its size, you should make the chips can be discharged smoothly, and it shall be provided with a helix angle. Its groove helix angle should vary with the type of [Read More]

►The drill bit types and characteristics 1) Species 1.1 high-speed steel drill bit (ordinary drill) The main system uses high-speed steel W, Mo-based material 1.2, (alloy drill) Tungsten titanium-based (YG), tungsten, titanium cobalt (YT) material. Physical and mechanical [Read More]

►Changsha langfeng introduce the operation and of taper shank twist drill (1). Determining the feed rate: Feed rate is generally depend on people&rsquo s experience, the value is general 0.08-0.12mm / rotation or 0.6-1.0mm / sec, feed speed is [Read More]

(1) The diameter of  high-speed-steel twist drill twist drill can be influenced by the aperture, spiral grooves make it be more detailed core drilling, drill rigidity is lower. There are only two edge band guidelines, hole&rsquo s axis are easily [Read More]