Accurate bits for precision drilling is very important to make and adjust wind instruments. Our drills are specifically designed with a centre point and ground edges for a clean and accurate drilling. They can be used for wood, metals and other materials as plastic, etc.
Carbon steel bits can be used on wood, plastic, soft materials or even soft metal, however they have a low tolerance to excessive heat which causes them to lose their temper, resulting in a soft cutting edge.
High speed steel (HSS) is a form of tool steel where the bits are much more resistant to the effect of heat. They can be used to drill in metal, hardwood, and most other materials at greater cutting speeds than carbon steel bits.
Titanium nitride (TiN) 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. A titanium nitride bit cannot properly be sharpened, as the new edge will not have the coating, and will not have any of the benefits the coating provided.
Jobber-length drills are the most common type of drill. The length of the flutes is enough so that they will drill a hole that is ten times the diameter of the drill.
Long series are about 2.5 to 3.5 times longer than a Jobber-length drill of the same diameter.
Screw-machine-length drill The shortest standard-length drills (that is, lowest length-to-diameter ratio) are screw-machine-length drills. They get their name from their most common application: use in screw machines.
Diameters and gauges
Number and letter gauge drill bits are still in common use in the US. In the past, they were popular elsewhere, but now have been largely discarded in favour of metric sizes.
Number gauge is routinely used from size 80 (the smallest) to size 1 (the largest) followed by letter gauge size A (the smallest) to size Z (the largest).
The gauge-to-diameter conversion does not follow a set formula, but rather was defined as a useful and practical measure.
g-60 = 1.016 mmØ, g-59 = 1.041 mmØ, g-58 = 1.067 mmØ, g-57 = 1.092 mmØ, g-56 = 1.181 mmØ, g-55 = 1.321 mmØ, g-54 = 1.397 mmØ, g-53 = 1.511 mmØ, g-52 = 1.613 mmØ, g-51 = 1.702 mmØ, g-50 = 1.778 mmØ, g-49 = 1.854 mmØ, g-48 = 1.930 mmØ, g-47 = 1.994 mmØ, g-46 = 2.057 mmØ, g-45 = 2.083 mmØ, g-44 = 2.184 mmØ, g-43 = 2.261 mmØ, g-42 = 2.375 mmØ, g-41 = 2.438 mmØ, g-40 = 2.489 mmØ, g-39 = 2.527 mmØ, g-38 = 2.578 mmØ, g-37 = 2.642 mmØ, g-36 = 2.705 mmØ, g-35 = 2.794 mmØ, g-34 = 2.819 mmØ, g-33 = 2.870 mmØ, g-32 = 2.946 mmØ, g-31 = 3.048 mmØ, g-30 = 3.264 mmØ, g-29 = 3.454 mmØ, g-28 = 3.569 mmØ, g-27 = 3.658 mmØ, g-26 = 3.734 mmØ, g-25 = 3.797 mmØ, g-24 = 3.861 mmØ, g-23 = 3.912 mmØ, g-22 = 3.988 mmØ, g-21 = 4.039 mmØ, g-20 = 4.089 mmØ, g-19 = 4.216 mmØ, g-18 = 4.305 mmØ, g-17 = 4.394 mmØ, g-16 = 4.496 mmØ, g-15 = 4.572 mmØ, g-14 = 4.623 mmØ, g-13 = 4.699 mmØ, g-12 = 4.801 mmØ, g-11 = 4.851 mmØ, g-10 = 4.915 mmØ, g-9 = 4.978 mmØ, g-8 = 5.055 mmØ, g-7 = 5.105 mmØ, g-6 = 5.182 mmØ, g-5 = 5.220 mmØ, g-4 = 5.309 mmØ, g-3 = 5.410 mmØ, g-2 = 5.613 mmØ, g-1 = 5.791 mmØ
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Renaissance Workshop Company Ltd.