![]() BEST OVERALL: Freud FB-100 16-PC Diablo Forstner Drill Bit Set.The best Forstner bit sets offer tremendous flexibility, great versatility, and excellent value. While available singly, Forstner bits are usually sold as boxed collections of eight or more. Forstner bits are also popular with woodturners, allowing large, deep holes to be cut on a lathe. The latter makes for fast material removal when cutting mortises, particularly when used in a drill press. Unlike a spade or twist drill bit, Forstner bits have no problem cutting at an angle and can drill partial or overlapping holes. These are great for dowel joints, or fitting catches in cabinet doors. Rather than drilling all the way through, a flat bottom hole has smooth sides, a small pilot point in the center, (and the name suggests) a flat bottom. As a result, there is seldom the need to cut deep holes in several stages, as you do with standard twist drill bits.Ī major advantage of a Forstner bit is that it’s made to drill flat bottom holes. It has a central point called a spur that is designed for accurate positioning, sharp cutting teeth, and wings to clear waste. Some techniques can overcome the problem, but the simple solution for making neat, precise holes is a Forstner drill bit. You could use a spade bit, but they often vibrate or “chatter” and can be difficult to control. Never grind or touch up the outside of the bit.While ordinary drill bits are quite efficient, their cutting action can create ragged holes, particularly when working with larger sizes. The rim needs less frequent sharpening but can be touched up using a round file or diamond stone on the inside. Sharpen by running a small flat diamond plate along the horizontal scraper cutter keeping the angle constant. Make sure you compare the sizes before buying. We have selected the fifteen most popular and common metric forstner bit sizes so that you have the most useful set in the one purchase. Beware of other metric sets and included sizes! They still retain clean cutting characteristics when used drilling across the grain but just not as clean as a true forstner bit - although acceptable for virtually all wood boring. All the bits in the set are true forstner bits up to 22mm, with all bits 25mm and larger having a sawtooth design.Ī sawtooth design makes them able to cut more easily when drilling with the grain (such as through end-grain). We can proudly say that after 30 years, these forstners offer excellent value for money, at a cheaper cost than almost all of our competitors, without sacrificing the quality and genuine reliability that makes a forstner so worth having in the first place. The common issue many people have with forstners is the cost factor - if you're only drilling flat-bottom holes on a semi-regular basis than many people try to avoid the initial outlay. The design permits large chip clearance easily and this combined with their ability to track truly makes them especially suited for drilling deep or extra large diameter holes. Extension bars are available for this purpose. They can be used to be bore in any direction and are extremely useful for boring holes on an angle or to true up and increase the size of an existing hole or timber imperfection. Hence they are not deflected easily by the natural differences in hardness found in timber such as knots or strong grain patterns. These forstner bits are superior because they come in a common metric size!įorstner bits are superior bits for drilling wood because they are guided by the rim and not a centre-point. ![]()
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