taper shank twist drills

Description

The twist drill is the most common type of drill. The shank of the drill is held by the machine tool, which in turn imparts a rotary motion. This shank may be straight or tapered. The body of the drill is typically made up of two spiral grooves known as flutes, which are defined by a helix angle that is generally about *0 degree but can vary depending on the material properties of the workpiece. The point of the drill generally form a **8° angle and includes a *0 degree clearance angle and chisel edge .The chisel edge is flat with web thickness of approximately 0.**5 x drill diameter. This edge can cause problems in hole location owing to its ability to "walk" on a surface before engaging the workpiece. In the case of brittle materials, drill point angles of less than **8 are used, while ductile materials use larger points angles and smaller clearance angles. Shaoyang Food Factory and Shaoyang Tool company of Da hongjiang Group, can provide different kinds of twist drills including straight shank, taper shank, hex shank, reduced shank and special twist drills. we have been the professional cutting tools producer among HSS twist drill bits, HSS center drills, HSS reamers, taps, dies, HSS end mills, solid carbide end mills, solid carbide twist drills, electric hammer drill bits, masonry drill bits, etc according to the standard from the clients, inclusing the DIN,JIS, xxxxx there is any requirement, pls contact with us:hlpacking at **3 dot com.