Problem translating object, newbie question.

I'm new to java3D, and I'm having problems translating an object. Here's the thing:
I have two different sets of dimensions for creating 2 boxes.
x1 = 100
y 1= 0
z 1= 100.
And
x 2= 50
y 2= 50
z 2= 50.
I divide everything by the maximum dimension (100). So:
x 2= 0.5 x1 = 1
y 2= 0.5 y 1= 0
z 2= 0.5 z 1= 1
So, now I have a box with dimensions (1, 0, 1) = (x1, y1 z1)
And the other one has (0.5, 0.5, 0.5) = (x2, y2, z2)
Here is what I want to do:
I want to put the second box on top of the first one. In order to do this I create a Transform3D object and call the set method with: new Vector3f(0, (x1+x2) /2, 0)
I thought that would work, but I end up seeing the second box half way or being on top of the first one.
Thanks for the help

I solved it, was kind of confused on which point of the box I was translating...

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