![]() ![]() Sharpening - use a drill sharpener, a grindstone jig or an oilstone. Always hold the drill square to the work and apply only light pressure when drilling. Special care is required when using the smallest sizes since these bits are thin and brittle. They are designed for drilling relatively small holes, they sometimes tend to clog quickly especially when the wood is 'green' so when drilling deep holes (especially in hardwood) the bits should be withdrawn regularly to remove the waste. Twist drills are usually available in sizes 0.8-12 mm plus. The coating is only really effective when metal is being drilled, it has little effect when working with other materials. This coating increases the hardness of the bit and adds a self-lubricating property. Twist bits are also available coated with Titanium nitride (TiN), these are easily identified by the gold like colour. 'carbon steel', these bits are specially ground for drilling wood and should not be used for drilling metals, they tend to be more brittle, less flexible than HSS bits.'high speed steel' (HSS), these are suitable for drilling most types of material, when drilling metal the HSS stands up to the high temperatures. ![]() They can be used on timber, metal, plastics and similar materials. The front edges cut the material and the spirals along the length remove the debris from the hole and tend to keep the bit straight. Usuallyreferred to as twist drills, twist bits are probably the most common drilling tools used by the handyman with either a hand or electric drill. A sharp bit will also give a cleaner hole. Learning how to sharpen drill bits is cost effective, it better to keep a bit sharp by occasional sharpening rather than waiting until it becomes really blunt.Ī sharp bit cuts better with less effort whether used in a power or hand drill. Good quality drill bits can be expensive, so take care of them, keep them in a case or box if possible, rather than allowing them to roll around loose in a toolbox where the cutting edges may be damaged. Many jobs around the house require a hole of some kind to be drilled - whether it is putting up a shelf, building a cabinet or hanging a light fitting.įor basic requirements, a set of high-speed steel twist drills and some masonry bits will probably be sufficient for the average handyman.īut for more sophisticated jobs/material, others bits will be required - perhaps larger, or designed for a specific material/purpose. To drill a satisfactory hole in any material, the correct type of drill bit must be used it must be used correctly and be sharpened as appropriate. See the chart below for these specifications.Twist bit - screwdriver bit - masonry - spur point - bullet pilot - countersink - tile - flat wood - hole saw - forstner - wood auger Screw machine drill bits' flute length and overall length are dependant on the diamater of the drill bit. They are often used in screw machine setup where spindle clearance is limited. Screw machine drills are popular in the automotive and construction industries. They come in a wide range of sizes, finishes and materials such as High Speed Steel, Cobalt and Solid Carbide. Screw Machine Drill Bits (also know as stub or stubby drills) are shorter than standard length Jobber Length Drill Bits. The shorter rugged construction performs well in a broad range of materials. ![]()
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