Per the US Navy plans, the steps are 1 3/8” thick (3/128” scale) and the legs are 1 ½” thick (3/128” scale). I have seen jigs that use the Byrnes saw (or similar) to cut these slots as well, but at these scales 1/76.8, the slicing blade on the saw is too wide and never mind the miniscule depth cut of the slot that would be needed. In his practicum for the
USS Constitution, Mr. Hunt avoided the problem all together by not building the gun deck and not showing any ladders leading to it. I needed something better. I found another ladder building method that other builders have used, albeit at a larger scale, but I am going to try it anyways. No leg slots are required.
The jig consists of alternate layers of two different thicknesses and lengths of wood glued together in such a way as to create slots of equal spacing. The wood thicknesses represent the step thickness and spacing distance. With aid of a ladder guide stuck on with double sided tape, the steps are placed into the thin slots up against the guide which is set at 53° for example. Because different hatchways have different widths and ladder angles, the jig must accept the narrowest ladder tread such that it extends out on either side to accept the gluing of the ladder legs.
I went ahead and built the jig but forgot to account for the ladder lean angle. As a result, my first jig was too narrow (left jig, the revised one is on the right). The second image shows the jig after a bit of sanding, and the third image shows it with the angle guides. I’m going to use two to support the steps on both sides to ensure all at the same angle. Then the ladder legs will be glued on.
I’m going to leave the build at this point as I must get ready for my trip to Mom’s to celebrate her 100th birthday at the beginning of June as I have previously mentioned. We’ll see how well the jig works when I get back to the shipyard.
