Gantry crane - videos

Gantry crane. By Topper Machine.

16:49 video:
https://www.youtube.com/watch?v=yxs_-GmPOAY

14:35 video:
https://www.youtube.com/watch?v=dAZ8Z3kM_zg

17:03 video:
https://www.youtube.com/watch?v=l1E1zX-Gm6k

7:40 video:
https://www.youtube.com/watch?v=xoTDIKz-xpk

Box shape is the strongest of structural steel but difficult to apply protective coatings inside. I-beam, H, U and angle shapes.. all sides can be painted.