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| Rosin
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A gummy substance produced from pine tree resin and used as a drying agent in paints and varnishes. |
| Rot
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Breakdown of a material caused by bacterial action. Rot typically results from damp conditions. |
| Rotary rasp and file
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Rotary rasps and files are designed for use on wood or soft metals. They are generally available in flat or round styles. |
| Rotary tool
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Rotary tools are smaller and easier to handle tools typically used on jobs that require high degrees of accuracy and precision. Combining high speed with the right accessory produces a very versatile tool. Uses for rotary tools include fine detailing, precision molding, etching glass, and drilling, as well as polishing and cleaning different materials. |
| Rotate
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To turn about upon an axis, such as the Earth. |
| Rotenone
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Material used a lot by organic gardeners. It is derived from the roots of tropical legumes. It does break down in sunlight and the side effect is that it is toxic to good and bad insects. |
| Rotor
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An electric generator consists of an armature and a field structure. The armature carries the wire loop, coil, or other windings in which the voltage is induced, whereas the field structure produces the magnetic field. In small generators, the armature is usually the rotating component (rotor) surrounded by the stationary field structure (stator). In large generators in commercial electric power plants the situation is reversed. In a wind energy conversion device, the blades and rotating components. |
| Rottenstone
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An abrasive material, typically limestone, used for smoothing surfaces. |
| Rough cuts
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Fast cuts that usually have rough edges that can be smoothed later. |
| Rough file
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A coarse file used to remove large amounts of material. |
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