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I am using a piece of rock maple but an angle iron scarf joint router jig 500 such will work too. Instead of a butt joint they make a long taper on each board and overlap the ends. The only problem is that it will jigg quite fit under the blade guard so 3 options are scwrf to me. For long pieces of wood I will support the end on a roller support adjusted to the height of the saw. Kayak Shop.

Make one pass with the router using a straight-flute plunge bit to remove the bulk of material. Then reset the router for a second, lighter cut, stopping just short of a feather edge at the plank end. You may wish to clean up the scarf with a few passes of a low-angle block plane. Here are some supplies and tools we find essential in our everyday work around the shop. We may receive a commission from sales referred by our links; however, we have carefully selected these products for their usefulness and quality.

By American Woodworker Editors. Router Scarfing Jig Boatbuilders often need to join boards end to end to make longer planks. Product Recommendations. The examples below shows a few common types:. The crossection of the plywood is 'butt' joined but the joint line itself assumes a serpentine shape or 'interlocking fingers' as in dovetailing to increase the glued area and to distribute the bending properties of the plywood.

Such joints can only be made with precise CNC machinery. One Ocean Kayaks stitch and glue kits are made with this type of joinery. Given the choices, I recommend the you to scarf all of your plywood with a few exceptions for it has the most good points namely excellent 'fairness' and negligible disadvantages.

As I pointed out earlier, this scarf joint is easy to do since the tooling jig can be made from scrap material but nicely flat! Once this thing is built, you can be scarfing consistently and accurately ad infinatum.

And the acute angle between the plates is?? Try to be as accurate as you can and make sure the guide strip is parallel to the edge of the jig along the entire length. Close-up of what it should look like. Note the guide strip at the bottom of the picture. This supports the saw so that it cuts at the same height along the scarf. It is vital that the clamping piece is very stiff and perfectly straight.

I am using a piece of rock maple but an angle iron and such will work too. The whole setup. The scarfed plywood is 24" 61cm wide and 8 ft long.

Note the blocks clamped to the edge of the table. These hold both plywood sheets together and even. If the sheets are not scarfed 'perpendicular', any error in alignment will double as you unfold and join the sheets together. Important: The sheets are scarfed with the good faces together!! Notice the economically minded offset of the plywood sheets.

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