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2. Riser (casting) - Wikipedia

   en.wikipedia.org/wiki/Riser_(casting)

   A bronze casting showing the sprue and risers. A riser, also known as a feeder, [1] 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.

3. Metal casting - Wikipedia

   en.wikipedia.org/wiki/Metal_casting

   For a riser to work properly the riser must solidify after the casting, otherwise it cannot supply liquid metal to shrinkage within the casting. Risers add cost to the casting because it lowers the yield of each casting; i.e. more metal is lost as scrap for each casting. Another way to promote directional solidification is by adding chills to ...

4. Sprue (manufacturing) - Wikipedia

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

   Bronze casting showing sprue and risers. A sprue is a large diameter vertical channel through which liquid material is introduced into a mold. It connects the pouring basin to the runner.

5. Pattern (casting) - Wikipedia

   en.wikipedia.org/wiki/Pattern_(casting)

   Segmented or multi-piece patterns create a casting in several pieces to be joined in post-processing. Match plate patterns are patterns with the top and bottom parts of the pattern, also known as the cope and drag portions, mounted on opposite sides of a board. This adaptation allows patterns to be quickly moulded out of the molding material.

6. File:Casting riser types.svg - Wikipedia

   en.wikipedia.org/wiki/File:Casting_riser_types.svg

   English: An image showing the difference between top and side risers, and open and blind risers. Based on diagram on from Degarmo, E. Paul; Black, J T.; Kohser, Ronald A. (2003), Materials and Processes in Manufacturing (9th ed.), p. 287.

7. Foundry - Wikipedia

   en.wikipedia.org/wiki/Foundry

   Degating is the removal of the heads, runners, gates, and risers from the casting. Runners, gates, and risers may be removed using cutting torches, bandsaws, or ceramic cutoff blades. For some metal types, and with some gating system designs, the sprue, runners, and gates can be removed by breaking them away from the casting with a sledge ...

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9. Cope and drag - Wikipedia

   en.wikipedia.org/wiki/Cope_and_drag

   The sand is then struck level with the top edge of the drag, using a wooden or metal strake. A board is then placed on top of the drag and the drag is flipped over. Then, the cope is placed on the drag, and dowels (or pins) are put in the sand to make holes for the sprue and one or more risers. Talcum powder and sand are again sifted over the ...