Brian (a friend from work) is building a Cedar strip canoe, and is having open houses for building. More important he is keeping an online blog of the event checkout the following link:
http://members.shaw.ca/grahambj/CanoeNight/I've shamelessly stolen what he has so far... but then what are friends for.
Unlike myself Brian main hobby is wood working. He has helped fiberglass a couple of canoes, and should do well there. In short the expectations for the project are set quite high.
As he is going to post the blog we'll see how he progresses.
Saturday, 19 April 2008
With the ground covered in snow, there was nothing more interesting to do than to start building the canoe. 6 ash and 6 cedar strips were milled to make the stems. Inner stems are 3 1/4 inch plies of cedar (7/8" wide), and outer stems are the same measurements, but in ash for added strength, since they are exposed and vulnerable to impact when the canoe will be used. The ash was locally harvested wood from Drew Beattie, that has been air-drying in the shop for quite a while.
After milling, the strips were steamed for about 20 minutes, in a length of ABS pipe, sitting on a kettle (with automatic shut-off disabled). When ready, they were immediately clamped onto the stem moulds, starting at the bottom point, and working around to the top using about 6 clamps. The strips were left clamped on the moulds overnight, then taken off to dry better, but tied to maintain the shape.
Steam bent stem strips drying.
Tuesday, 22 April 2008
On Tuesday the first stem was laminated using epoxy, using #403 filler to thicken the epoxy for better gap-filling. The inner and outer stems were separated by a layer of packing tape, to ensure they do not get bonded together. The form edge was also protected with packing tape to ensure the stems don't get glued onto it. Second stem was laminated on Wednesday.
First set of inner and outer stems laminated and clamped to the form
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Sunday, 27 April 2008
After a concerted effort to clean up the shop, including installation of more fluorescent lights, there is now almost enough room to turn around. The space was immediate put to use, and the air filled with cedar dust.
All the cedar was cut into strips. I had 5 lengths of 1x6 - 18' clear cedar. It was purchased at the same time as the wood for the canoe course; special order from Windsor Plywood. To minimize wastage, I used a 7 1/4" very thin kerf Freud Diablo saw blade, and was able to get 18 strips from each 1x6. I have kept all the strips in order, for ease of matching grain patterns later.
Saturday and Sunday, 3-4 May 2008
Levelled the strongback, and set up the stem and station-6 moulds. Then cut 1/4" strips of walnut, mahogany, and some very dark cedar to use in feature strips.
Tuesday, 06 May 2008
The first Canoe-building open-shop night was well attended, and good progress was made. All stations were aligned and secured, including reinstallation of the stem and station-6 moulds. The process was aided by inserted Xacto blades in thin cuts on the centre line (top and botttom) of each station, as positive stops for a straightedge. This made aligning the keel end of each form with the taut line strung over very quick and precise. (Thanks for the suggestion, Murray!)
The end result can be seen in the photo below; every station is dead-on the line.
Tuesday, 13 May 2008
I cut up all the pieces for the chevron design Feature Strip. Three thin strands of walnut will divide and surround the chevron, made of alternating very dark cedar and lighter mahogany. The chevron design will be at bow and stern ends, about 24" in length, and in the middle, about 15" in length. Between these, the strip will be plain cedar, with the three narrow walnut strips running the full length. The photo shows the glue-up of half the centre chevron pattern.
I spent some very productive time sharpening my block plane, my one good chisel, and the blade of a borrowed spokeshave. These three in combination made shaping the lower 8-9" of the stems quite easy. I will install several strips before continuing the shaping, in order to better secure the stems.
Chevron pieces, and 1st glue-up. Shaped stem.
Friday - Monday, 16-19 May 2008
The badly needed long weekend respite was spent on strip preparation. The glue-up of the chevron-patterned feature strips was completed, the thin walnut strips for feature were scarfed together (1:12 slope joints), all strips were thicknessed, and bead and cove run on all edges. Thus the installation of strips is ready to start.
Tuesday, 20 May 2008
The first two strips were installed, one on either side of the canoe, after critical assessment of the line of curvature. This first strip is located at the sheer line along the middle of the canoe, but the sheer rises more quickly at the bow and stern. A graceful even curve was achieved by following the sheer line from the middle to stations 4, and with slight downwards pressure bringing the strip a bit lower on the stem. Where the strips follow the sheer line they are nailed, as the gunwales will cover that part. Simple clamping sticks, with sandpaper glued onto the surface, are screwed onto stations 6 and 7 to hold the strip with no marking. They are also glued directly to the side of the shaped inner stems.
Handling the strips is a looming issue. Mixing strips from the different planks will minimize variations between large areas by scattering the variations more evenly. To do this requires being able to pick strips from any of the different planks at any time. I need to set up some storage rack to do this, with the 18’ long strips. Also, I need jigs to hold strips while putting glue into the cove. Time spent now setting up an efficient system will pay dividends later.
First two strips on the form.
Sunday to Monday, 16-19 May 2008
I made a simple strip rack, using, of course, all scrap material. There are 3 supports screwed to the trusses, and each has 5 shelves cantilevered out to support the strips. I tilted the rack at enough angle that the strips won't tend to fall off the front, but not so much that the flip onto their flat side. It seems to work quite well. The other pieces were the L-shaped clamping brackets, and lots of wedges. Plain wedges are used to hold the strips to the form, and wedges with beads are used to wedge down the strips that have the cove up. Of course, the orientation of the strips will change at mid-feature strip to be cove down. (Think about that ... changing directions saved difficult calculations on the width of the middle chevron piece. If you cut the cove on the wide side on one, and bead on the wide side of the other, the second must start off longer because the exposed edge moves inward. Look at the photos below.) Finally, three scraps of OSB serve as holders for strips for applying glue. They have 3 slots, just wide and deep enough for the strip to sit comfortably in.
On Monday night, with Chris's help, the second and third strips were installed (glued and wedged tight). Cleanup was done by scraping the glue after it had started to skim over, and then trying to wipe with a damp cloth. The latter didn't accomplish much. reducing the amount of glue will be the best solution.
Tuesday, 27 May 2008
Two more strips were installed, making a total of 3 on each side. I am getting too much squeeze out, and need to better control the amount of glue.
The feature strips are next, but I have decided to assemble them into full length pieces; just need to glue solid cedar pieces the run between the segments of chevron design. If all 8 are cut to the same length, the patterns will align easily. Measuring is the critical part. I intend to simply mark a full length strip, and use the chevron pieces to mark off how much of the cedar strip is needed. Then if they are all cut to identical lengths, it will all work like a charm ... provided I confirm with a dry fit first.
The use of monofilament line to hold strips in place was considered and abandoned (see current issue of Wooden Boat Magazine). Instead, I will construct an outer frame, and wedge or clamp the strips tight to the form.
Clamped and wedged, two more strips on the form.