11/30/2023 0 Comments Power drill bits![]() ![]() ![]() Masonry drills are usually used in a power drill although they can be used with a lot of effort in a hand brace. Some masonry drills are described as 'durium tipped', this term refers to a highly durable silicon bronze alloy used instead of tungsten as the cutting point. The cutting tip is often made from tungsten carbide bonded to a spiralled steel shaft. Masonry bitĪs the name suggests, these are designed for drilling into brick, block, stone, quarry tiles or concrete. They are ideal for drilling pilot holes but are limited by the low power of these type of screwdrivers and the limited size of small bits available. Screwdriver bit drillsĭesigned to fit in rechargeable screwdriver these bits have a hexagonal shank. Forming the correct angle at the tip is important for efficient cutting. Titanium nitride bits cannot be sharpened without destroying the coating (although if the drill needs sharpening, the coating will probably have already been destroyed). 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quickly especially when the wood is 'green' so when drilling deep holes (especially in hardwood) the bits should be withdrawn regularly to remove the waste.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.
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