Each part has a main MJ and as many auxiliary MJ as supporting parts or blocks.

If a deviation in the position or the orientation of an auxiliary junction brings a risk of failure in the mechanism, it must be constrained in position relative to the main junction.

You can specify these positioning constraints by editing the auxiliary MJ.

Similarly for an FS, if a deviation in the position or the orientation of an FS brings a risk of failure in the mechanism, it must be constrained in position relative to the main MJ.

You can specify these positioning constraints by editing the FS.

Damper Mechanism Example: Auxiliary MJ of the Lower Support Part

Auxiliary MJ Positioning Upper Support

A deviation in position along y or z or in orientation around u, v, or w of the surfaces of the auxiliary MJ impacts the orientation and distance geometric requirements of the mechanism.

The auxiliary MJ must be constrained in position and in orientation relative to the main MJ positioned on the plate (external environment).

Under Positioning Constraints, you can specify the type of constraint, and indicate if the local clearances of the auxiliary MJ are favorable or not:

• P(L) (resp. P(M)): Applies a position constraint to all the surfaces of the MJ with unfavorable (respectively favorable) clearances.
• O(L) (resp. O(M)): Applies an orientation constraint to all the surfaces of the MJ with unfavorable (respectively favorable) clearances.
• PO(L) (resp. PO(M)): Applies position and orientation constraints to all the surfaces of the MJ with unfavorable (respectively favorable) clearances (PO(L) is the appropriate choice in that case).
• More: Lets you define different positioning constraints for primary, secondary, and tertiary surfaces of the MJ.

The local clearances of the reference main MJ are unfavorable in that case.

Auxiliary MJ Partially Positioning Damper

A deviation in position along y or z or in orientation around v or w of the surfaces of the auxiliary MJ impacts the orientation and distance geometric requirements of the mechanism.

The auxiliary MJ must be constrained in position and in orientation relative to the main MJ positioned on plate (external environment).

The positioning constraint dialog box allows choosing the appropriate type of constraint, and indicating if the local clearances of the auxiliary MJ are favourable or not:

• P(L) (respectively P(M)): For the position constraint applied to all the surfaces of the MJ with unfavourable (respectively favourable) clearances.
• O(L) (respectively O(M)): For the orientation constraint applied to all the surfaces of the MJ with unfavourable (respectively favourable) clearances.
• PO(L) (respectively PO(M)): For the position and orientation constraints applied to all the surfaces of the MJ with unfavourable (respectively favourable) clearances (PO(L) is the appropriate choice in that case).
• More: For defining different positioning constraints for primary, secondary and tertiary surfaces of the MJ.

The local clearances of the reference main MJ are unfavorable in that case.

Damper Mechanism Example: Auxiliary MJ of the Upper Support Part

Auxiliary MJ Partially Positioning Damper

A deviation in the position along y,z, or in orientation around v or w of the surfaces of the auxiliary MJ impacts the orientation and distance geometric requirements of the mechanism.

The auxiliary MJ must be constrained in the position and orientation relative to the main MJ positioned on the lower support.

The position and orientation constraints applied to all the surfaces of the MJ with unfavorable clearances (PO(L)) is the appropriate positioning constraint in that case.

You can indicate which failures might occur if the positioning constraints are controlled poorly.

Damper Mechanism Example: FS of the Damper Part

FS Damper Cylinder

A deviation in the position along z or in the orientation around v or w of the damper cylinder FS impacts the orientation and distance geometric requirements of the mechanism.

The auxiliary MJ must be constrained in the position and orientation relative to the main MJ positioned on the lower support and upper support block.

Under Positioning Constraint, you can specify the type of constraint and indicate if the local clearances of the auxiliary MJ are favorable or not:

• P(A): For the position constraint applied to the center element of the damper cylinder surface.
• P(L) (respectively P(M)): For the position constraint applied to the damper cylinder surface with favorable least (respectively maximum) material condition.
• O(A): For the orientation constraint applied to the center element of the damper cylinder surface.
• O(L) (respectively O(M)): The orientation constraint applied to the damper cylinder surface with favorable least (respectively maximum) material condition.
• PO(A): Fot the position and orientation constraints applied to the center element of the damper cylinder surface.
• PO(L) (respectively PO(M)): For the position and orientation constraints applied to the damper cylinder surface with favorable least (respectively maximum) material condition.
• TR: For the total runout constraint applied to the damper cylinder surface (it is the appropriate choice in that case because the damper part can rotate).
• CR: For the circular runout constraint applied to the damper cylinder surface.