Making rigid box using machines involves several steps, which are as follows:

1. Cutting the Box Material: The first step is to cut the box material into the required size and shape using a die cutting machine. The machine should be set to the appropriate settings for the material being used, and the operator should follow all safety guidelines.
2. Folding the Box: The next step is to fold the box along the creases. This is usually done using a box staying machine that applies pressure to the creases process to create sharp, precise folds.
3. Applying Adhesive: The folded box is then passed through a gluing machine that applies adhesive to the appropriate areas of the box. The machine should be set to the correct glue type and amount for the particular box being made.
4. Inserting the Board: If the rigid box requires a board to provide extra rigidity, the board is inserted into the box using a board insertion machine.
5. Assembly: The box is then assembled by bringing the sides together and pressing them firmly to ensure a tight, secure fit. This is typically done using a box wrapping machine.
6. Quality Control: Once the box is assembled, it should be inspected to ensure that it meets the required standards for size, shape, and strength. Any defects should be identified and corrected before the box is packaged and shipped.

Overall, the specific machinery and processes used may vary depending on the type of box being made, the materials used, and the equipment available. It is important to follow all safety guidelines and manufacturer instructions when operating machinery and to properly maintain the equipment to ensure optimal performance.