Constraints are inferred when sketching new or modifying existing geometry. This process of inference decides which constraints are available to the geometry as the shape and orientation are varied. As a constraint is inferred, the constraint symbol is shown, as well as dotted alignment lines, if applicable.
Constraint persistence determines if inferred constraints are maintained after the geometry is created. If constraint persistence is turned off, constraints are not created automatically. Varying inference and persistence settings can affect the results of sketch operations. Parametric dimensions , a type of sketch constraint, control the size and position of geometry.
Dimensions are created automatically when you enter values in the input boxes as you create geometry or manually using the General Dimension command. Dimension values can be expressed as numeric constants, as variables in an equation, or in parameter files. Edit a dimension to change the size of the associated geometry.
You can edit sketch dimensions before or after a sketch becomes part of a feature. If a sketch has not been consumed by a feature, its dimensions are visible and can be edited. After a sketch is consumed by a feature, select the feature in the browser and activate the sketch for editing. If applying a dimension would over-constrain the sketch, you can accept or cancel the dimension. If you accept the dimension, the dimension is saved as a reference parameter, its value is enclosed in parentheses, and it updates in response to changes in normal dimensions.
You can also choose how dimensions are displayed using options in the status bar at the bottom graphics window.
In the Inventor sketch environment, dimensions can be categorized into two types: normal dimensions and driven dimensions. When you change the value of a normal dimension, the geometry resizes accordingly. Driven dimensions, conversely, are nonparametric dimensions that show the current value of geometry. Driven dimensions, which appear enclosed in parentheses in the graphics window, allow sketch geometry to dynamically respond to associated changes.
The closer to an exact size an item or feature must be manufactured, the more expensive it becomes. Conversely, the part may not function correctly if the tolerance range is too large.
A company standard usually establishes the allowable tolerance for dimensions. Set up your company standards as defaults in the Document Settings dialog box and specify standard tolerances and a default tolerance. Add a row for each unique combination of precision level and tolerance range.
The ways in which sketch geometry can change size or shape are called degrees of freedom. For example, a circle has two degrees of freedom: its center and its radius. An arc has four degrees of freedom: center, radius, and end points. If you eliminate all degrees of freedom by applying constraints or dimensions, the sketch is fully constrained.
If any degrees of freedom remain unsolved, the sketch is under-constrained. See our Privacy Policy and User Agreement for details. The SlideShare family just got bigger. Home Explore Login Signup. Successfully reported this slideshow. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.
Goal programming. Upcoming SlideShare. Like this presentation? Why not share! Embed Size px. Start on. Show related SlideShares at end. WordPress Shortcode. Next SlideShares. Download Now Download to read offline and view in fullscreen. Download Now Download Download to read offline. Goal programming Download Now Download Download to read offline.
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The objective function then becomes the minimization of a sum of these deviations, based on the relative importance within the preemptive structure assigned to each deviation. The units profit from product A is Rs. The goal of the firm is to earn a total profit of exactly Rs.
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