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  2. Harbor Freight Tools - Wikipedia

    en.wikipedia.org/wiki/Harbor_Freight_Tools

    Harbor Freight Tools won a declassification of the class action; that is, the court found that all the individual situations were not similar enough to be judged as a single class, and that their claims would require an individual-by-individual inquiry, so the case could not be handled on a class basis.

  3. Underground pneumatic boring - Wikipedia

    en.wikipedia.org/wiki/Underground_pneumatic_boring

    The valve reopens, and the cycle repeats. The friction between the tool and the earth keeps the tool from sliding back. Tool speed is controlled by manipulating the air supply to the tool. This air supply valve is outside the tool and remains accessible to the operator. As the tool pounds through the ground, it compresses the soil.

  4. Timing belt (camshaft) - Wikipedia

    en.wikipedia.org/wiki/Timing_belt_(camshaft)

    In many older overhead valve engines, the camshaft is located in the block near the crankshaft, therefore a simple gear system is often used to drive the camshaft. Overhead camshaft engines mostly use timing belts or timing chains, since these are better suited to transferring drive over larger distances.

  5. Cam follower - Wikipedia

    en.wikipedia.org/wiki/Cam_follower

    A cam follower, also known as a track follower, [1] is a specialized type of roller or needle bearing designed to follow cam lobe profiles. Cam followers come in a vast array of different configurations, however the most defining characteristic is how the cam follower mounts to its mating part; stud style cam followers use a stud while the yoke style has a hole through the middle.

  6. Crosshead - Wikipedia

    en.wikipedia.org/wiki/Crosshead

    A crosshead as part of a reciprocating piston and slider-crank linkage mechanism. Cylindrical trunk guide Hudswell Clarke Nunlow; crosshead and two slide bars. In mechanical engineering, a crosshead [1] is a mechanical joint used as part of the slider-crank linkages of long stroke reciprocating engines (either internal combustion or steam) and reciprocating compressors [2] to eliminate ...

  7. Air bearing - Wikipedia

    en.wikipedia.org/wiki/Air_bearing

    When placing the air bearing with the sensor chip, they must not touch the wafer surface being measured. As for the up-and-down movement, a pneumatic piston is used which is, for repeatability reasons, also air-guided. The preload of the air bearing and thus the gap height are also adjusted with this piston. Chuck with integrated lift drive