Many ask about how to expand aluminum honeycomb core. Basically there are 2 ways. One way is to pull by hands. 2 skilled workers hold each end with arms open, and pull the honeycomb core slice till most honeycomb cells become hexagonal shape. And make some adjustments where the shape is not ok. The other way is to pull by honeycomb expansion machine. And the precondition is that you have the machine. In this way what you need do is just follow the machine instruction.