Drill Bits
The drill bits listed below are the most common ones used in woodworking.
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Auger Bit
These are also referred to as ship-builders bits, the auger design and long length make drilling deep holes much easier as the chips are removed very efficiently. Use with care when drilling thin material because the auger will catch on the edge of the material and pull the bit through very quickly. Brad Point Bit
Brad point bits are easy to line up to a mark with the center point, they drill clean splinter free holes with a flat bottom, very good for dowels.
Countersink Bit
Expansion Bit
These have an adjustable cutting bar that make it possible to drill any size hole, a shorter cutting bar is used to drill smaller holes. Holes smaller than the holder cannot be drilled with this bit. Forstner Bit
These bits are for precision work, where a clean hole is required. It is also possible to drill overlapping or angled holes with these bits. Spade Bit
These are an inexpensive bit suitable for general work, they do not have good chip clearing ability and tend to split thin material. Twist Bit
This is the most common type of drill bit, they are used for both wood and metal. They are available in many grades and styles. Using Drill Bits Always wear eye protection. Don't apply to much pressure on small drill bits Ease up on pressure when drill breaks through material. The larger the drill bit the slower the speed of the drill. Use a vise or clamp to hold the material to prevent it from spinning if the drill bit catches. To prevent wood splintering when the bit exits clamp a piece of scrap material to the back of it. If possible stop drilling just as the point of the bit comes through the material, then finish drilling the hole from the other side. Drilling Metal
When drilling a large hole in metal a small lead hole helps to relieve the feed pressure required. Extra Long Drill Bit
To make an extra long bit to drill through wood or sheet rock pound the end of a iron rod flat, grind or file the end to a point. More About Drills
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