Re: The Kohnen Scarfing Jig
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Some years ago I made a "scarfing jig" by welding a few pieces of angle iron, making a frame, and bolting a router on to a heavy plywood carrier to move back & forth across the 4 ft width of a piece of plywood. It sort-of worked,but the 1/4 in plywood (yes the plain stuff not the high dollar stuff0 did not want to lie flat enough that there in lied the difficulty. - - since I have sandwich secured plywood sheets between layers of 2x stock and scarfed with a belt sander using a rather coarse sanding belt.
Then at glue-up doing the thin epoxy first for soak-in and epoxy thickened with corn starch or very fine wood flour for adhesive glue-up seems to work great. use a couple of very small finishing nails to keep the scarf from squeezing apart as I clamp the whole scarfed area with 2x on each side - wax paper between the 2x and the plywood and some added thickness in the middle (remember I am scarfing whole 8ft x 4ft plywood sheets) to keep the clamping tension sufficient in the middle.. Yes, this is odd business, but what can one do when one wants plywood more than 8 ft long and has decent bending qualities. It worked for me - may work for you. - AND the work surface was indeed large to accommodate the length of the 2 pieces being scarfed. - - Best of luck on your projects -
Gerard Mittelstaedt in McAllen, (deep south) Texas
On Fri, Apr 3, 2020 at 2:20 PM John Kohnen <jkohnen@...> wrote:
Thanks for looking that up, Jove. I'll have to print that out and post
Gerard Mittelstaedt -- mittel48@...