12:1 scarf in 1/2" beam web plywood
fits real nice,
pencil lines are 1" from each planned scarf edge and are used to control the overlap amount,
they should be 8" apart after the joint is completed,
you can't reliably use the wood edges since
they may be slightly ground away by the planing process
special attachment for electric planer to make 12:1 scarfs
extensions of attachment keep planer at the correct tilted depth across the workpiece,
the work table has 12:1 ramps on each side,
the planer rests on them as you cut across between them
some reinforcing to prevent any flexing in the attachment
planer attachment has stops to prevent the planer blade from carving into the ramps
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