Click on New, select the Metric tab and choose Standard (mm).iam

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Click on New, select the Metric tab and choose
Standard (mm).iam The icon looks like three
isometric cubes stacked in a pile.
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Click on Place component (on the left hand menu)
and find the wooden box components. Insert one of
Part1.ipt
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Click on Place Component again, this time insert
one of Part2.ipt
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Click Constraint (or press C on your keyboard)
and choose 'Flush' then select the surfaces
highlighted in this picture. Check where the
rebate is on your parts. Flush makes the surfaces
line up with each other. Click Apply. If you
don't click apply then you might lose your
changes.
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This time constrain these surfaces, again using
the flush option.
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Now fix these two parts completely by
constraining the highlighted surfaces in this
picture.
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Now bring another Part1 and another Part2 and
constrain them in the same way as before. You
should now have something like this picture.
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Add another constraint to bring all four parts
together. This time we are using the 'Mate'
constraint which makes these surfaces oppose each
other.
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Make these 2 surfaces flush with each other.
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One more constraint to complete the shell of the
box. Make these surfaces flush.
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This is how your box should look. Make sure you
have the rebate running along the inside edge.
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Place a new component, called base.ipt Constrain
these two surfaces, using the mate option
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Make these 2 surfaces oppose each other using the
mate constraint.
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By adding a flush constraint to these surface the
base will be completely fixed to the shell of the
box.
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Bring in the lid by placing a new component. It's
called lid.ipt See if you can make the lid fit.
The sides and ends should be flush with the box.
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This is how your box should look.
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Extra
Play with the 'Offset' tool in the Constraint box
to see if you can get your box to look like this.