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2. Twilight switch - Wikipedia

   en.wikipedia.org/wiki/Twilight_switch

   Also, keep in mind that ignition is based solely on the amount of natural light present and not on the height of the sun, so "unwanted ignition" may occur, for example in the presence of compact clouds associated with a significant drop in ambient light on the sensor (e.g., when there is a storm). To avoid this, twilight switches can be ...

3. Facing (machining) - Wikipedia

   en.wikipedia.org/wiki/Facing_(machining)

   This process removes the material by rotating the facing tool in the counterclockwise direction as the table feeds the work piece across the cutter. Face milling can be achieved with an end mill, but is often done with a face mill, shell mill or a fly cutter. Face milling can be done in both manual machining and CNC machining. To obtain a ...

4. Turning - Wikipedia

   en.wikipedia.org/wiki/Turning

   Turning is a machining process in which a cutting tool, typically a non-rotary tool bit, describes a helix toolpath by moving more or less linearly while the workpiece rotates. Usually the term "turning" is reserved for the generation of external surfaces by this cutting action, whereas this same essential cutting action when applied to ...

5. Undercut (manufacturing) - Wikipedia

   en.wikipedia.org/wiki/Undercut_(manufacturing)

   Top and Front view of a milled undercut slot. In milling the spindle is where a cutting tool is mounted. In some situations material must be cut from a direction where the feature can not be seen from the perspective of the spindle and requires special tooling to reach behind the visible material.

6. Motion detector - Wikipedia

   en.wikipedia.org/wiki/Motion_detector

   A motion detector attached to an outdoor, automatic light. A motion detector is an electrical device that utilizes a sensor to detect nearby motion (motion detection).Such a device is often integrated as a component of a system that automatically performs a task or alerts a user of motion in an area.

7. Fuller (groove) - Wikipedia

   en.wikipedia.org/wiki/Fuller_(groove)

   As a blacksmithing tool, a fuller is a type of swage, a tool with a cylindrical or beveled face used to imprint grooves into metal. Fullers are typically three to six inches long. If a groove is to be applied to both sides of the steel, two fullers may be used at the same time, sandwiching the workpiece in the middle.

8. Commutator (electric) - Wikipedia

   en.wikipedia.org/wiki/Commutator_(electric)

   In small appliance and tool motors the segments are typically crimped permanently in place and cannot be removed. When the motor fails it is discarded and replaced. On large industrial machines (say, from several kilowatts to thousands of kilowatts in rating) it is economical to replace individual damaged segments, and so the end-wedge can be ...

9. Glossary of electrical and electronics engineering - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_electrical_and...

   A record player, a device that converts the mechanical movements of a stylus in a disk or cylinder recording groove into sound. photocell A light sensor that produces or alters a voltage when light is present. photodetector Any device that detects visible light. photodiode A two-terminal device whose terminal voltage or current changes in ...