Hi,

I am new to solid works and cannot reproduce the attached file made in 123d.  The object is a hollow sphere within a hollow sphere with a hollow column attaching the 2.  I have figured out how to make a sphere and to make hollow objects but I am stuck on the following:

1. How to you center the smaller hollow sphere in the other one?

2. How do I extrude a column on the curved sphere(cant get the planes figured out)?

Thanks in advance for any help on this.

Oliver