This post is about drilling the centerboard. Both the perpendicular hole and the hole through the centerboard trunk.
I was very nervous about the perpendicular hole through the centerboard. It needed to be perfectly perpendicular or the centerboard would have a wobble and that would be bad. Let's cover that first.
I had already painted it with epoxy and then filled the oversize hole. The oversize hole didn't matter if it wasn't perfectly perpendicular as long as I didn't hit any wood when drilling my perpendicular hole.
I have a drill press, but the centerboard is very heavy and I would have to support it with something. And my forstner bits are not very long, so I had limited play in the table of the drill press.
After futzing about with it for awhile, I remembered my angle meter. I pulled it out discovered that again, it's batteries were dead. I think the little soft buttons are too easy to push. A cr2025 later and I was measuring and making sure that the angles were all correct. Then I drilled. At this point, I had only graphite powdered the other side, not this side.
Here's the result. Not too bad.
This was nerve racking because I had a plan (see the earlier post), but had never done anything quite that complicated. I took lots of shots.
|Here is the 1/2" hole centered.|
|I put tape on it to hold it still.|
|Then drilled the holes into the centerboard sides. (note the tape to make sure I don't drill too deep.|
|Take the plat off and now I can put any plate on there.|
|Now take the pin out and put it in on this side|
|And you get a pin out the inside.|
Now to do the same thing on the outside of the boat. Unfortunately, the planks are on the boat. That makes it harder because you can't fit a drill in very well. I have a right angle drill, but it's still a bit too big with the forstner bit in there.
|I was ably get 3 of the holes drilled, which is enough.|
Now that I had both sides drilled and ready to accept any of my plates, I wanted to drill out the hole to a larger size with the 7/8" hole guide.
Unfortunately, I didn't want any rip out inside the centerboard trunk because it would be very difficult to repair, so that means I had to stick a chunk of wood in the trunk. But how could I get it back out again? I happened to have a spare chunk of white oak that fit just perfectly and was nice and hard. I screwed a chunk of plywood to it to push it in and out.
I shoved that down through the centerboard and left it in place while I drilled with the 7/8" forester bit.
|Stuck down the centerboard trunk.|
|Now the 7/8" plate is on and you can see the 1/2" hole just a bit.|
|I drilled with the 7/8" forsner.|
|I put packing tape on the stick and put it back down.|
|Then I filled the hole with epoxy, microballons and silica.|
I still had a bit more to do, though. Since I had some glue mixed up, I wanted to glue in the bushings. I scratched them up for adhesion, then put them in with glue.
|Bushings before gluing|