Notice that the designated constraint is listed in

Notice that the designated constraint is listed in the window in the top part of the dialog.
This listing window uses the same interactive expand/collapse operations (and other
symbols) as is used in the Assembly Navigator.
Select Apply to accept the constraint.
More About: Align Constraint
Use the Align constraint when one geometric entity lies everywhere on the other.
Example:
By everywhere, we mean that an align constraint is solved using unbounded geometry, so the
geometric entities do not have to actually touch to be aligned.
1) Align constraint uses unbounded geometry.

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Usage Matrix: Align
Assigning Mating Conditions
Defining a Mate Constraint
Next, apply a constraint that will keep the back, flat face of the spacer mated with the
stepped shoulder face on the shaft.
Choose the Mate icon from the Mating Conditions dialog.
Select the Filter pulldown and choose the Face option (if necessary).
Select the inside, flat face of the spacer.
Again, notice that the TO icon is automatically activated.
Select the flat shoulder face of the shaft.

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This time preview how the intended mating constraint will act. The Preview function lets
you see the intended mating before you actually apply the constraint.
Choose Preview .
Again, the designated constraint is listed in the window in the top part of the dialog.
The spacer should be allowed to rotate on the shaft, so these two components are mated
sufficiently.
Select Apply to accept the constraint.
More About: Mate Constraint
Use the Mate constraint when you want to mate objects of components with opposing
normals and want to define a physical contact between two entities.

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1) Selected ("from") face on the base component
2) Selected ("to") face on the mated component
Usage Matrix: Mate
.
Assigning Mating Conditions
Mating the Caster-Fork
Next, you will apply some constraints to the caster_fork in relation to the caster_shaft and the
caster_spacer.
Again, you will be using the mating constraints:
Align
Mate
First, Align the cylindrical hole face of the fork with the shaft.

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Choose the Align icon mating condition.
Select the Filter pulldown and choose the Face option (if necessary).
Select the cylindrical hole face of the fork. Use the select options cursor/box to aid
selection, if necessary.
Select the stepped cylindrical face of the shaft.
Choose Apply to accept your mating operation.
Next, Mate the back face of the fork to the outward face of the spacer.
Choose the Mate icon from the Mating Conditions dialog.
Select the back side face of the fork.
Select the outside face of the spacer.

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Remember, you can use Preview to check the result of your mating operation before you
actually accept it.
Choose Apply to accept your mating operation.
Your successful solution should look like the illustration below.