My back is still in trouble, but I could not help it as I thought this would be a very low impact thing to do and I did not do all of this in one sitting. The image might not make that much sense. I know it is or seems a rather elaborate setup, but I wanted to be sure that my center reference frames were as much dead on as I could get. Errors always
accumulate no matter how careful.
Here are my thoughts:
I did not want to start the process of installing FRAMES
at the bow as I was concerned that the propagation or (
accumulation) build-up of errors would occur as I reached the end of the Stern.
You will see from this last image (below) of the Machinist Square that the BOTTOM TIP is at
REFERENCE LINE #18.
Therefore, I decided to make TWO CENTER FRAMES become the reference. One will be the reference going towards the Bow and the other will be the reference going towards the Stern. This way, perhaps I might avoid any build-up of error as the frames are inserted and glued.
The square rod horizontal is a 6mm rod that is the amount of separation between the frames. The tip bottoms of the machinist squares are not what they seem. From the images, it looks like the squares are sitting midway of the reference points on the Lower Base Plate. But the location of the machinist squares is right on the mark and therefore sets the frame 90° verticle. I also measured the frame from side to side to make sure the outside edges are also the same on each side. From the Frame, outer EDGE to the JIG SIDE measures 30mm exact on each side. So, I know that the frame is sitting square in that dimension as well.
You will see from the last image of the Machinist Square that the TIP is at
REFERENCE LINE #18.
Now I have to go back and lay down -