# pattern

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## pattern

Manufacturing a wooden or metal shape or model used in a foundry to make a mould
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

## Pattern

The juxtaposition of repetitive elements in a design, organized so as to produce an arrangement of parts that are viewed as an unit; may occur at various scales and sizes.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

## Pattern

(also, development), in geometry. The pattern of a polyhedron is a set of polygons for which it is shown how the sides and vertices of the polygons must be joined in order to ob-

Figure 1

tain the polyhedron. Several conditions must be met here: each side of a polygon must be joined to no more than one side of another polygon; it must be possible to pass from one polygon to another polygon by traversing pairwise joined polygons; and joined sides must have equal lengths. The pattern of a cube is shown in Figure 1.

Figure 2

In such fields as descriptive geometry and drafting, the concept of pattern is sometimes applied to curved surfaces. Thus, the pattern of the lateral surface of a cone is a sector of a circle (Figure 2).

## Pattern

(Russian, shablom), in foundry production, an element of a gated pattern, consisting of a flat device whose working side has a highly accurate profile. A distinction is made between molding and control patterns. The former, in the form of wooden boards, are used in individual and small-series production; they take the place of a solid casting pattern or corebox in the manufacture of casting molds and mold cores for medium-size and large castings having the outline of a body of revolution (such as cups, vats, covers, and pulleys). The cavity of the mold or the working surface of the core is produced by rotating the molding pattern around its central axis (a core spindle is positioned at this place in the mold). Control patterns are made of plywood or sheet steel and are used for checking the accurate placement of cores in the cavity of a casting mold during assembly and preparation for pouring.

M. N. SOSNENKO

## pattern

(aerospace engineering)
The flight path flown by an aircraft, or prescribed to be flown, as in making an approach to a landing.
(engineering)
A form designed and used as a model for making things.
(graphic arts)
A design or form.
(mathematics)
An equivalence class of colorings of the elements of a finite set, which are indistinguishable with respect to a group of permutations of the colors.
(ordnance)
The distribution of a series of shots fired from one gun or a battery of guns under conditions as nearly identical as possible, the points of impact of the projectiles being dispersed about a point called the center of impact.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

## pattern

1. A model made in some easily worked material (such as plaster or wood) which serves as a guide, with respect to form and dimensions, in laying out any piece of work, esp. to preserve and secure uniformity and accuracy.
2. A design, considered as a unit, of which an idea can be given by a fragment, as a diaper pattern.
3. In molding, a form used to provide the interior shape of the mold.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

## pattern

i. A flight pattern that an aircraft must follow when approaching for landing and when leaving the airport after takeoff.
ii. Radiation of the transmitting aerial as plotted on a diagram of the field strength for each bearing.
iii. A shape traced out on the ground by the track of the aircraft while following certain procedures, such as making the circuit, making procedure turns, while holding, and while carrying out demonstrations. See circuit and holding pattern.
References in periodicals archive ?
A technique to produce a mirror-image wax pattern of an ear using rapid prototyping technology.
A paralleling mandrel was attached with surveyor for the correct position of patrix placement in wax patterns (Figure 2).
Here, a forest of pink wax patterns reached toward the ceiling, each one an exact duplicate of the turbine blade or vane for which it would one day melt.
In those scenarios colored green, conventional investment casting with molded wax patterns was the least expensive method of manufacture.
Using response surface method we propose a mathematical model for predicting contractions of wax patterns depending on process parameters.
Compared techniques are milling of Zirconia, selective laser sintering (SLS) of a dental CrCo-alloy, and investment casting of CrCo-alloy from Drop-on-Demand (DoD) wax patterns. The coupling surface of each manufactured cap is inspected and compared with its CAD model to give information about fabrication processes accuracy.
AFS managed and used the AMC funds to pay for wax pattern production, heat treating, x-ray inspection and testing.
* Wax pattern was fabricated on the refractory cast which was duplicated from the master cast for the fabrication of metal denture base.
"There's virtually no difference once we go to a rubber mold and a wax pattern in the test performance of a casting made off a printed pattern vs.
The wax pattern of the ear was obtained by 'donor technique'.
Philbrook introduced a pressure casting method for producing gold fillings for cavities in 1896 that featured a wax pattern, sprue pin and metal ring inserted directly into the patient's mouth.

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