In pattern making, the term used for rounding out of external edges of the pattern is called as a fillet.

Pattern and Pattern Making topics include: Pattern types and functions, pattern and casting differences, jointing and pattern materials, pattern design, pattern fillets, patterns storage, pattern making and colours. In the casting process, patterns are used to form a mold cavity that determines the shape of the casting. Patternmaking is the process of designing patterns.  Here are some types of patterns used in casting: Match plate pattern: A two-piece pattern that is mounted on a plate. This pattern is used in machine molding and produces accurate castings quickly. Loose piece pattern:... Show more

Pattern and Pattern Making topics include: Pattern types and functions, pattern and casting differences, jointing and pattern materials, pattern design, pattern fillets, patterns storage, pattern making and colours.

In the casting process, patterns are used to form a mold cavity that determines the shape of the casting. Patternmaking is the process of designing patterns. 

Here are some types of patterns used in casting:

Match plate pattern: A two-piece pattern that is mounted on a plate. This pattern is used in machine molding and produces accurate castings quickly.
Loose piece pattern: Allows manufacturers to remove a piece of solid pattern above or below the mold's parting plane. This pattern requires skilled labor and is expensive.
Single piece pattern: Also known as a solid pattern, this is the least expensive casting pattern. Casting producers prefer this type of pattern because the rectangular blocks are suitable for small-scale manufacturing and simple operations.
Skeleton pattern: Used to produce an outline of the large final casting by assembling wood segments. This pattern reduces the cost and waste of material for producing simple large casting.
Gate pattern: Used to create gating systems in the mold. These systems define the channels through which molten metal enters the mold cavity.
Sweep pattern: A curved pattern used to create long, curved castings features. This pattern often produces pipes, tubes, and other components.
Shell pattern: Made by pouring a mixture of sand and resin on a heated metal pattern and then curing it at a high temperature. This pattern is used for producing large-size pipes and fitting type casting. 

Patterns can be made from many materials, including wood, metal, plastics, and wax. The material chosen depends on the casting volume and process used. 

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