This is a simple jig you can fasten to the bottom of a skilsaw to make quick and easy scarf joints for stitch and glue boat or skiff building. Its easy and fun.
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This is step 2 of a series of movies illustrating the stitch and glue boat building technique.
Scarf joint plywood. Marine and other plywood is sold in 4 x 8 243m or 5 x 10ft 3m sheets so if your kayak is any longer the plywood will have to be joined into longer pieces. Always cut the plywood panels to the. Plastic is laid over the scarf joint and the process is repeated until all the panels are glued up.
The most common methods of joining plywood are the butt joint with backer block the scarf joint and a hybrid between the two. The issue is how to connect it together so that the joint between the sheets will have the same or very close properties as the rest of the plywood. A strong table which is the same width as the plywood you are scarfing either a power hand plane a belt sander a jack plane or even a smooth plane for removing the bulk of the wood in the scarf joints roughing in.
Basic steps to cutting a scarf joint in plywood. I use them to build tolman alaskan skiffs. Many boat parts require plywood lengths greater than the standard 8 feet so joining together two panels of plywood is an important step.
This makes the scarf joint much harder to accomplish but it provides a joint that is virtually invisible. Brian dixons easy plywood scarf bevel cutting technique. Making a scarf joint.
The angle of the tapering is 112 or 110 for plywood under 12 inch thick and 18 for plywood over 12 inch thick. The scarf joint shown is at a ratio of 112 but some use a 110 ratio up to 12 and 18 for thicker plywood. Scarf joints require tapering the edges of both pieces of plywood equally and evenly.
Learn how to master the scarf joint technique for plywood boat building. Long duplex nails are driven through the stack to the saw horse below. As an example at a 112 ratio 14 thick plywood would have a scarf joint length of 3.
The scarf joint length is found by multiplying the thickness of the plywood being joined by the ratio. Plastic is laid over the top scarf joint and a 6 wide piece of 12 plywood is laid over that covering the scarf joint.
Scarf Joint Wikipedia
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Japanese Style Scarf Joint Scarf Joints Wood Joinery