I make jigs not so much that I enjoy doing so, but I do it becuase it helps me figure things out better. It is not for everyone, so ... and also, you can be welcome to copy any ideas that I come up with. I am sure that this goes way beyond anyone that cares to get this involved in trying to find the "center" on anything. Actually, I am not being perfectionist about this. I am engineering minded so my heart follows with the gadgets and jigs to help me do things better. At any rate, I do not want to become long winded as there are people that have other ideas that would suffice them.
I made for lack of better description, a trellis as you see here to help facilitate many things. It has helped me so far in alot of measuring. The trellis are glued with regular Titebond - no nails. I used a machinst square to make sure they are square. The other stick across the top is a feabled attempt to make a "center" ruler before I actually found one in a store. I used this jig to help me find center across the whole keel.
As far as the deck or top of the ship, I used plain dividers as the photo describes in itself.
Ok, now, I found that my hull out of the box was not centered. I found that the
Keel Center Line was (ok at the stern keel but off about 3/32 or a little more at the bow of the keel). sorry about my lack of natical terms. (forward Keel "off" aft Keel "ok")
How did I find this out - I am trying to remember !
It seems that I had the ship in vise with
deck up as I was looking down on the deck. I took the pair of dividers and I measured the "center" at 3 places.
The 3 places were the 3 deck steps.
Aft Step, Midship Step and fore Step. Again, I plead forgiveness of my lack of nautique. I marked the Center Line with a mechanical pencil.
I then turned the ship over with the Keel facing upwards. It seems to me that I took some sanding paper wrapped around a 3/8" square stick and I started to lightly sand along the whole keel until I started to notice a good visible "flatness" of the keel. I think I measured a 4mm width and maintained that while allowing for the sanding to find the "natural" center by sanding. This worked for me, but I did have that 3/32 offset at the bow. However, let me say that after I drew my line down the center of the Keel , I noticed that the Center Line of the Top of the Deck
LINED up with the Center Line of the Keel.
So with that, I figured that by sanding the keel edge first, it sorta found its natural center. I am not sure if I am explaining myself here or not. Maybe I got lucky, who knows.
Let me say it this way. Straight out of the box, I measured the Center Line on the deck. I turned the Ship over, and
did not measure anything, but started sanding the keel's edge. By sanding the Keel's edge, the center of the Keel became more prominate and exposed enough.
Then I could mark and measure the center line of the Keel from aft to fore.
Ok, now that I have over explained alot of Goop here !
Donnie