Straight shank twist / straight shank twist is the most widely-processing tool. Typically diameter range of 0.25 to 80 mm. It is mainly composed of the working portion and a shank portion. Work section has two spiral grooves, the shape of twist, hence the name. Straight shank twist twist their composition of different functions can be divided into three parts: 1. drill altar clamping part with handle, and to deliver the desired drilling force (torque and axial force) . 2. Drill neck portion of the cutter body and located in the transition between the shank. Empty slots are commonly used as a knife with wheel retraction. 3. The working portion of the drill bit body. By cutting portion (i.e., a drill tip) and the guide part. Straight shank twist parameters in order to reduce the guide portion of the hole when drilling intramural friction, straight shank twist drill point since the direction of the shank diameter decreases inverted cone. Straight shank twist helix angle of the cutting edge mainly affects the size of the front corner, edge flap strength and chip performance, usually 25 ° ~ 32 °. Spiral groove available milling, grinding, hot rolling or hot extrusion methods such as processing, after the cutting portion is formed by the front end of the drill bit sharpening. Cutting corners standard part of 118 straight shank twist, chisel edge angle is 40 ° ~ 60 °, after the angle is 8 ° ~ 20 ° due to structural reasons, a large rake angle at the outer edge, gradually decreases toward the middle , chisel at a negative rake angle (up to about -55 °), from squeezing action when drilling. In order to improve cutting straight shank twist, can be processed in accordance with the nature of the material will be ground into various shapes cutting part repair (such as drilling group). Straight shank twist shank form there are two straight shank and taper shank, when caught in the drill chuck machining former, the latter is inserted in the machine spindle or tailstock taper in. Generally straight shank twist producing high-speed steel. Inserts welded carbide blade or crown straight shank twist suitable for machining cast iron, hardened steel and non-metallic materials, solid carbide straight shank twist drills for machining small parts and printed circuit boards and other instruments. Northern Tool Works is located in the country's largest wholesale center in the amount of work the tool. Is a professional production of Stuttgart long straight shank taper shank twist drill, deep hole drilling, drilling ladder, reduced shank drill, white steel cutter, tapping machine, milling cutter, etc., over the years by the majority of users of all ages, has a leading market share, may undertake the development and manufacture of various types of tools. Product Source: www.beigongtools.cn/ straight shank twist Other Information: www.beigongtools.cn/zjbeigong-Products-301508/ straight shank twist www.beigongtools.cn/zjbeigong-Products-301557/ taper shank twist