Technical Information · DRILLS
DRILL POINT ANGLES
Selection of drill point angles affect tool performance. Flat points, (larger point angles) offer better cutting action & more aggressive angles create torque. Sharper points (smaller point angles) are better for soft, non-ferrous materials. · 118°: General purpose · 125°: For soft non-ferrous materials
· 130°: For mild steel
· 134°: For mild steel
· 135°: For harder materials
· 140°: For hard materials and high performance
· 150°: For hard materials and high performance
COST Uncoated Drills Economy
Combination of the drill geometry, tool material and coating helps drive the level of performance.
PERFORMANCE LEVEL Coated Drills General Purpose Deep Hole High Performance Heavy Duty
· Economy: used for short run jobs and provides the lowest price point option. · General Purpose: generally preferred for the machining of non-ferrous and non-metallic materials and alloys. · Deep Hole: for general purpose and heavy duty drilling operations. · High Performance: meets the tough demands of production level manufacturing. Longer life and recommended for increased speeds and feeds when drilling aluminum, cast iron and other easy to machine materials. · Heavy Duty: for drilling a wide variety of ferrous materials including steel, cast steel, cast iron, stainless steels and other alloyed or non-alloyed ferrous metals.
NUMBER OF FLUTES
The sum of the cutting edges that impact the workpiece material. Flutes provide a path for the removal of chips and carry cutting fluid to the front of the cutting tool.
0 Flute: For use in soft materials including brass, copper, hard rubber and fiber that frequently clog the standard helical flutes with chips.
2 Flutes: The conventional type of drill used for originating holes. Excellent for non-ferrous metals.
3 Flutes: Drill commonly used for enlarging and finishing.
4 Flutes: Used interchangeably with 3 flute drills. They are of similar construction except for the number of flutes.
Choice of tool material is driven by the workpiece material, number of holes desired along with the life of the drill. · High Speed Steel: economical choice for general applications in most materials including steel, cast iron and forgings. Provides good tool life and efficiency. · Cobalt: M35, M42, better than high speed steel, they hold their hardness at much higher temperatures and are well suited for harder to machine materials and stainless steels. · Solid Carbide: resists wear better than both high speed steel and cobalt steel. Has a better degree of accuracy for drilling very hard materials such as stainless steel, titanium alloys and nickel alloys. · Carbide Tipped: same benefits as solid carbide for a fraction of the cost.
Coating or surface treatments have a direct effect on tool performance and tool life. They also build a barrier between the drill and workpiece. · AG Coated: TiAlN Multilayer Coating Outstanding thermal and chemical resistance properties increases the stability of the cutting edges & improved chip flow. · AlTiN: Aluminum Titanium Nitride Coating Ideal for high temperature cutting operations in titanium and nickel alloys, stainless steel, steels and cast irons. It creates a hard aluminum oxide layer as temperature increases, insulating the tool and transfering heat into the cutting chips. · Black & Bronze Oxide Coated: Reduces friction & allows higher speeds. · Bright: Surface is untreated. Use for general purpose drilling of most metals, wood and plastic. · Bronze Oxide Coated: Reduces friction & allows for higher speeds. Known appearance color for cobalt. · SG Coated: Silicone Multilayer Coating Use for high performance drilling of carbon steels, stainless steels, aluminum and high-temp alloys. · Steam/Black Oxide: An inexpensive black coating. A black oxide coating provides heat resistance and lubricity, as well as corrosion resistance. These result in a longer bit life than possible for the typical uncoated high speed steel bits. For drilling of ferrous metals such as steel, stainless steel and cast iron. · TiAIN Coated: Super Life Titanium Aluminum Nitride Dark Violet/ Black - considered superior to TiCN and can extend tool life five or more times. More stable at higher temperatures than TiN or TiCN. Increases machining speeds by 75% to 100%. · TiN Coated: Long Life Titanium Nitride - Bright Gold - is a very hard ceramic material, and when used to coat a high-speed steel bit can extend the cutting life by three or more times. Increases machining speeds by 25% to 30%. · TiCN Coated: Extra-Life Titanium Carbonitride Violet/Blue-Gray superior to TiN and more wear resistant; increases machining speeds by 35% to 50%.