Unigraphics NX Interview Questions & Answers

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The same model is used from conceptual design to the Drafting, Assembly, Analysis and Manufacturing. The idea of a virtual assembly taken to its logical conclusion leads to Master Model paradigm. If you change any thing in Master Model, it will reflect in all other applications.

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It is a PDM (Product Data Management) software which helps the organisation effectively control the design, development, analysis, manufacturing through out the product of life cycle.

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We can convert a file created in mm to inches by using UG command prompt.
ug_convert_part (space) -in (space) 1234.prt
Note: Save your file where command prompt showing location; Example:- C:/users/username

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User defined feature is used to create the objects of different sizes in a single file. We can create our own form features that automate commonly used design elements. You can create and add the user defined features (UDFs) to target solids. You can define the shape and function of features, and create hierarchical libraries of features that are tailored to our need.

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When you have an assembly that is work part, this option lets you promote a body from a loaded assembly component to the level of the assembly. The promote body remains associative to the original body, which is referred to as the base body.
Once you have promote a body, you can perform operations on it, such as adding features, performing Boolean operations between it and other bodies, and so on. The effects of these operations are only visible at the level of the assembly work part in which the promote was created, and in any other assembly that references that part.

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This option create an associate copy of composite curve, sketch, datum, point, face, body, mirror body of part file in assembly file. Once you have a wave linked boy you can perform operations on it. (Example: In Machining model you can add wave link of Casting model and perform the machining operations)

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This option create an associate copy of an entire body in part file. Features can then be added to Extract Body feature without appearing on the original body. You can also decide whether you want he Extract Body feature to update when the original body is changed.

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This option let you create a family of parts by creating a template part. You can use the Unigraphics spread sheet (via the Create button on the Part Families dialog) to create a table describing the various part family members.

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Expressions are mathematical or conditional equations used to control the parameters of a model. With expressions, you can easily apply major edits to a model. By changing the expressions that control a specific parameter, you can re-size or re-position features of a solid model

• Three types of Expressions are there
• Arethmatic Expressions
• Conditional Expressions
• Geometric Expressions

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Direct modeling techniques represents extended capabilities for some of the more basic Unigraphics functions. Among these are face oriented operations, constraint based methods, blend regeneration and independence of feature history. You can use Direct modeling functions on models that have been imported from other CAD systems and are nonparametric.

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we can use Undo for 222 times or until up to last time saved.

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There are 216 colors in UG.

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There are 256 Layers in UG.

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Grip programs can be executed as button action by specifying grip executable file names. The uses of Grip are

• Simplify Repetitive Operations
• Standardized Results
• Interactive commands.

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The Weight management option allow us to calculate and control the weight and other mass properties of parts, components and assemblies based on the solid bodies they contain.

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The Unigraphics NX Knowledge Fusion application provides a graphical user interface that allows us apply engineering knowledge driven rules and design intent to geometric models and assemblies in Unigraphics.

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There are four types of modeling.

• Solid Modeling
• Feature Based Modeling
• Free Form Modeling
• Sheet Metal Feature Modeling

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Para solid is form of translator which is used to open the higher version Unigraphics part files to in lower version of Unigraphics. For example we can open the NX7.5 version part files in NX4.

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We can create a mosquito coil by first creating an inclined helix curve and then projecting it to the bottom plane. Then we need to use the sweep along guide command.

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Datum Plane is reference feature that can be used to as construction tool in building the model.

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Datum Axis, which is a reference object you can use to create other objects, such as Datum planes, revolved features, and extruded bodies. Datum Axis can be either relative or fixed.

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Constraints limit structural movement and represent mounts and supports. Constraints can be applied to faces or edges. (Restricting the degree of freedom)

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There are two types of constraints.

• Geometrical constraints
• Dimension constraints

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To create a sketch, you must associate the Sketch feature to a planar object. We can select a face or Datum plane. This plane is know as sketching plane.

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• IGES – Initial Graphic Exchanges Specifications.
• STEP – Standard For The Exchange of Product Model Data
• DXF – Data Exchange Format

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Co-ordinate System is a reference element. It uses X,Y and Z co-ordinates while creating model.

Following are the three types of Co-ordinate Systems

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In Rotational WCS we can give the angle by which the WCS need to rotate by typing it in the space provided, while in Dynamic WCS we can dynamically rotate the WCS and give the angle.

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Sketch curve are parametric and can constrain but basic curves are non parametric and cannot constrain them.

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There are 22 types of Geometrical constrains in Unigraphics NX.

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There are 256 layers in Unigraphics.

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We find these options in section command of free form feature.

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We find the Bounded plane command in Insert –> Surface –> Bounded Plane.

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The idea of virtual assembly taken to its logical conclusion leads to Master Model paradigm. In this concept a master model of the component is designed and the same is referred by those in assembly, drafting, analysis and manufacturing department of the particular company.

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Displayed parts are the parts which can only be displayed but not editable while we can both display and edit a work part. Both displayed part and work part comes under assembly.

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In Reattach, You can reattach a already created sketch to a different planar face or datum plane.

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String mode is an option which is available while creating lines and arc using basic curves. When the string mode is selected we can draw continuous lines or arc. If the string mode is not selected we can create only one line or arc at a time.

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Reference set controls the the amount of data that is loaded from each component and viewed in context of an assembly. (Data likes Datum Planes, Axis, Solid body, Sheet body, Sketches, Curves etc)

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In top down assembly we create the different parts in the same assembly file and assemble it there itself.

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In bottom up assembly we create the different parts of an assembly in separate file and then get them and assemble using constraint.

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There are 8 mating constraints in assembly. Mate, Align, Angle, Parallel, Perpendicular, Center, Center, Distance and Tangent.

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There are three ways to find the sketch is fully constrained.

• In sketch environment (status bar)
• In part navigation
• Checkmate

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NURBS is Non Uniform Rational Bezier Splines.

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B surface is Bazier surface.

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Expand command is used in Drafting. In the drafting application you can use expand to create and edit objects in specific view.

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Section strings is defined as the curves which represent the section of the profile in Sweep along guide or Swept command.

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By using single segment option in Tube we get a single smooth solid along the guide curve.

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The law curve option lets you create a spline using the law Sub-function. A law spline is defined by a set of X, Y, and Z components. You must specify a law for each of these three components.

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Angle – o.5
Distance – 0.0254

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The minimum blend radius is part tolerance.

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Primitive features are the basic analytic shapes. They are non associative, meaning they are not associated to geometry used to create them.

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There are four primitives. They are Block, Cylinder, Cone and Sphere.

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In Ruled feature two section strings are necessary.

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We will use primary strings and cross strings in Through Curve Mesh option for creating a free form feature.

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We can use 37 characters for a part file name.

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A face blend can be created between the faces of solid and / or sheet bodies. The faces can be non adjacent and/ or part of a different sheet body.

Soft blends let you create blends whose cross sectional shape is not circular.

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A Datum plane is a reference plane that serves as aid when existing planes are not available. The datum plane can be editor later. The fixed datum plane are datum planes which cannot be edited later.

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We can identify by going to Information –> Others –> Object – specific –> Dimension with Manual Text.

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We can create 11 types of views in drafting.

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The maximum number of guide curves used in Swept operations is Three (3).