![]() ![]() You can use a 118-degree angle for soft material drilling such as aluminum, softwood etc. HSS drill bits are used to drill mild steel, cast iron, softwood, plastic, hardwood, fiber, and many soft materials. Read More About – 26 Types Drill Bits for – Metal | Wood | Stone | Concrete Usage and Cutting Speed? Workpiece Material Point Angle Helix Angle Lip Relief Angle Aluminum 90 to 135 32 to 48 12 to 26 Brass 90 to 118 0 to 20 12 to 26 Cast iron 90 to 118 24 to 32 7 to 20 Mild Steel 118 to 135 24 to 32 7 to 24 Stainless Steel 118 to 135 24 to 32 7 to 24 Plastics 60 to 90 0 to 20 12 to 26 Drilling angle and workpiece material Source ![]() The cutting angle should maintain according to the material requirement. You can use a file or grinder made with carbide or diamond. When the drilling produces more noise is another sign of sharpening. You can sharpen the HSS drill bit when the chipping length is below 0.02,” or drilled holes are out of the tolerance. Diamond drill bits are used for the drilling and cutting of extremely hard materials such as tile, glass, and stone, etc. It is higher than HSS.Įxtremely strength than HSS. Although HSS is coated with some materials, its hardness can’t be compared with the carbide drill bits. Using a carbide drill bit, you can drill more fast and high RPM. So Cobalt drill bits can be run faster and high-speed feeds.Ĭarbide drill bits are more strong than HSS drill bits. These tools are really hard, strong, and heat resistant than regular HSS. ![]() When the cobalt is added 5%, it is called 5% cobalt, and 8% is called super cobalt. Cobalt Drill bits are different from HSS with the mixed cobalt percentage. HSS is less strong than the cobalt drill bits. Steel Drill bits can be overheated when it uses for tough material drilling such as cast iron, concrete, stone, etc. Steel drill bits are used to drill the softwood and some plastics. HSS drill bits are more strong and hard than steel drill bits. Read More About – How to Identify the Drill Bits? – Expert Guide! You have to pull out and then drill again. This means when you drill once, you can drill 2-3 times the drill diameter into the material without tool coolant. The high-Speed Steel drill bit can only drill 2-3 times the drill diameter before pecking. Rockwell C (%) Term M1 0.80 1.50 8.00 4.00 1.00 – 63-65 “HSS” M2 0.85 6.00 5.00 4.00 1.90 – 63-65 “HSS” M7 1.00 1.75 8.75 4.00 2.00 – 63-65 “HSS” M35 0.80 6.00 5.00 4.00 2.00 5 65-67 5% Cobalt M42 1.10 1.50 9.50 3.75 1.15 8 65-67 Super Cobalt M50 0.85 0.10 4.25 4.00 1.00 – 63-65 “HSS” High-Speed Steel (HSS) types and Mixed Material Type Usage M1 Use for general purpose M2 Twist drills, reamers, milling cutters, taps, and dies, broaches, knives, saws, cold work tools M7 Heavy construction equipment M35 Use for fast cutting and durable cutting tools M42 Use for higher cutting speed tools M50 Use for drill bits, ball bearings Types of High-Speed Steel (HSS) and its usage Properties of High Speed Steel M1, M2, M7, M35, M50, M42 are the strength class of the HSS. By changing these material proportions, its hardness can be varied. HSS drill bits are made with 0.85% C 4% Cr 5% Mo 6% W 2% V (M2). ![]()
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