Just go to the hubber's hubs. To be more specific you can try the following steps:
1. Click on my user profile or image.
2. Go to the Hubs Section in the profile. Every Hub has Like buttons on right side.
3. Share any hub (any topic not necessarily - mechanical engineering), you like, on Google+, Facebook, Twitter, Pinterest - only if you have added social profiles. You have added only facebook, twitter and your own blog on mechanical engineering.
4. As your blog is about mechanical engineering, it will be better to put links to hubs on mechanical engineering at your own blog by giving proper title different from the hub title - In the body post you can write summary of the hub leaving the last line of summary as a link to URL of the Hub, you would like to post on your blog.