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Assembly Constraints - Part I - Learning Autodesk Inventor [Video].
Inventor Assembly and Constraints - MAE3.
Assembly constraints remove degrees of freedom between selected components. Adaptive components can resize or change shape when constraints are applied. Specifies the type of constraint and illustrates the solution used to position components before you apply the constraint.
Change constraint type and place constraints when the dialog box is open. When you select a face, curve, or point including midpoint , an arrow shows the default direction of the solution.
Click constraint icons on the dialog box to change solution. Use constraint limits to define the range of allowable movement or rotation.
You can specify a maximum, minimum, and resting position value for constraints in the Assembly tab. Supports user specified limits and resting position. Selects geometry on two components to constrain together. You can specify one or more curves, planes, or points to define how features fit together. You can see the geometry to which a constraint is applied.
A color bar on each selection button corresponds to the color of the selected geometry. If you make a mistake and want to select different geometry, click the appropriate selection command and reselect. Specifies distance by which constrained components are offset from one another. Use to enter a value equal to a distance or angle that exists in the assembly, but when you do not know the offset or angle.
Click the down arrow to measure the angle or distance between components, show dimensions of selected component, or enter a recently used value. Specify positive or negative values. Default setting is zero. The first picked component determines the positive direction. Enter a negative number to reverse the offset or angle direction. Shows effect of the constraint on the selected geometry. After both selections are made, underconstrained objects automatically move into constrained positions.
Default setting is on. Clear the check box to turn preview off. If either component is adaptive, constraints are not previewed. For an angle constraint, with an empty Offset box, the angle is measured and automatically applied. Sets the constraint name and options for assembly constraint limits.
Check the box to activate. Clear the check box to deactivate. Type and Solutions Specifies the type of constraint and illustrates the solution used to position components before you apply the constraint. A Mate constraint positions components face to face or next to one another with faces flush. Removes one degree of linear translation and two degrees of angular rotation between planar surfaces.
Mate constraints Positions selected faces normal to one another, with faces coincident. Flush constraint Aligns components next to one another with faces flush. Positions selected faces, curves, or points so that they are aligned with surface normals pointing in the same direction. Angle constrain Positions edges or planar faces on two components at a specified angle to define a pivot point.
Removes one degree of freedom in rotation or two degrees of angular rotation between planar surfaces. Directed Angle Solution always applies the right-hand rule. Does not support user specified limits and resting position. Undirected Angle Allows either orientation, thus resolving situations where component orientation flips during a constraint drive or drag.
Explicit Reference Vector Explicitly defines direction of Z axis vector Cross Product by adding a third pick to the selection process. Reduces tendency of angle constraint to switch to an alternate solution during a constraint drive or drag.
This solution is the default. Tangent constraint A causes faces, planes, cylinders, spheres, and cones to contact at the point of tangency. Tangency can be inside or outside a curve, depending on the direction of the selected surface normal. A tangent constraint removes one degree of linear translation. Between a cylinder and a plane, it removes one degree of linear freedom and one degree of rotational freedom.
Inside Positions the first selected part inside the second selected part at the tangent point. Outside Positions the first selected part outside the second selected part at the tangent point. Outside tangency is the default solution. Insert constraint A combination of a face-to-face mate constraint between planar faces and a mate constraint between the axes of the two components.
The Insert constraint positions a bolt shank in a hole. The shank aligns with the hole and the bottom of the bolt head mates with the planar face.
A rotational degree of freedom remains open. Opposed Reverses the mate direction of the first selected component. Aligned Reverses the mate direction of the second selected component. Show me how to set constraint limits. Selection Selects geometry on two components to constrain together.
First Selection Selects curves, planes or points on the first component. To end the first selection, click Second Selection or the second face in the graphics window. The first selection is previewed in the same color as the select button color bar in the graphics window. Second Selection Selects curves, planes, or points on the second component. The second selection is previewed in the same color as the select button color bar in the graphics window Third Selection Available for Explicit Reference Vector angle constraint.
Selects a face, linear edge, work plane, or work axis. The third selection is previewed in the same color as the select button color bar in the graphics window. Pick Part First Limits the selectable geometry to a single component. Use when components are close to or partially obscure one another. Clear the check box to restore selection mode.
Offset or Angle Specifies distance by which constrained components are offset from one another. Show Preview Shows effect of the constraint on the selected geometry. Predict Offset and Orientation If the Offset box is empty, inserts the offset and orientation for mate, flush, and angle constraints. The default setting is On. Clear the check box to set orientation and offset manually. If the selected component normals indicated by direction arrows point in the same direction, a flush constraint is inferred.
The offset between them is measured. If the selected component normals are opposite, a mate constraint is inferred. More Sets the constraint name and options for assembly constraint limits.
Name Creates a unique name for the constraint in the browser. You can enter a name or leave blank and a default name is automatically created. For example, a constraint with a Maximum value of mm, a Minimum of 0-mm and an Offset of mm assumes the mm position after a drag. Maximum Sets the maximum extent of constraint movement. The assigned value is retained when the check box is cleared. Minimum Sets the minimum extent of constraint movement. Parent topic: Assembly relationships overview.
Related Information Use Joint to define and manage relationships Place Mate or Flush constraints in assemblies Place Angle constraints in assemblies Place Tangent constraints in assemblies Place Insert constraints in assemblies Place Symmetry constraints in assemblies Create assembly constraints using the Assemble command Place assembly constraints using ALT-drag Apply assembly constraints to sketch geometry Find relationships in assembly Delete assembly relationships Edit assembly constraints Drive relationships in assemblies Place Motion constraints between assembly components Place Transitional surface constraints Place Constraint Set constrain UCS to UCS.
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