RISER

Riser

A riser, also known as a feeder, is a reservoir built into a metal casting mold to prevent cavities due to shrinkage. Most metals are less dense as a liquid than as a solid so castings shrink upon cooling, which can leave a void at the last point to solidify. Risers prevent this by providing molten metal to the casting as it solidifies, so that the cavity forms in the riser and not the casting. Risers are not effective on materials that have a large freezing range, because directional solidification is not possible. They are also not needed for casting processes that utilized pressure to fill the mold cavity. A feeder operated by a treadle is ...

The above text is a snippet from Wikipedia: Riser (casting)
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riser

Noun

  1. Someone or something which rises.
  2. A platform or stand used to lift or elevate something.
    The choir stood on risers for the performance.
  3. The vertical part of a step on a staircase.
  4. The main body of a bow.
  5. A conduit or path between floors of a building for placement of telephone, networking, and other utility cables.
  6. A Manx cat with an extremely short tail.


The above text is a snippet from Wiktionary: riser
and as such is available under the Creative Commons Attribution/Share-Alike License.

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