The ship's grating shown here is slightly less than one inch (2.54 cm) on a side. It was scratch built with the aid of the device shown below.
This is a jig that was built to make the parts for a grating. It fits on top of a miniature table saw.
It ensures that each cut in the piece of wood will be a uniform distance apart and at the correct depth. The individual pieces of wood are glued together at one end so that many can be cut at the same time.
Once all the pieces of wood have been slotted, it is a simple matter to fit them together to make the final item.