cabin sides, Kerfing

Wrap arounds ready to go on

Posted by Paul

I slept in today and missed the chance to work in the relative coolness of the morning. I got to the shed at 11am and it was already stinking hot so by 3.00pm I had gone home for a swim. I did manage to get the kerfs cut on the wrap around panels and potter around measuring things and generally wasting time because the heat up on the boat was such that I did not get the timber braces that will create a rest for the kerfed panel onto the boat.

kerf splinterswraps kerfed

Cutting the kerfs was also quite a time consuming job. I set them 50mm apart along the inside of the curve. I re read the construction manual and it says there is no set distance apart but recommends about 80-90mm apart. I assume that to also mean at the inside of the curve but it does not say. At 50mm apart along the inside of the curve means 115mm apart along the outside of the curve. So I went with this and marked all of the lines at that distance. But once I had cut the kerfs in the first half of the first wrap around and did a quick test to see if the kerfs would allow the panel to curve enough, I realised that I did not need that many kerfs and I started cutting every second line and as luck would have it, I started at the tighter end of the curve on the first one so it worked out that whilst I might need the extra cuts on the tight end of the curve I would not need them as the curve levelled out. So I cut the other side the same way, leaving every second line for the last 5 lines. That’s 10 less lines I had to cut and 10 less I will need to fill with glue later.

I was tempted to pick one of the panels up and try out the complete panel to see the shape but it is just too fragile. I will have to wait until it is on the boat. One thing finally occurred to me today after cutting many kerfs. I often get splinters but not always. And today I started at the top of one panel worked to the other end (we will call it the bottom) then from the bottom of the next back around to the top as per the pic above. And at the bottom few kerfs on both panels I got splinters but not on the cuts before or after, so it could not be the blade or the saw. I realised today that it is the grain of the glass. I had thought it might be the blades getting blunt or the battery failing thus lowering the rpm on the battery saw but today I used the electric knowing the battery one would not last for the entire job. I do recommend leaving the peel ply on when cutting kerfs in duflex, it does mean you have to remove a lot of thin strips of peel ply but it does reduce splintering.

I am very close to being able to fit the wrap around and it is only the first week of January so I am pretty sure I will get this thing done this month.

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