Very long knives, like your machette example, may be too long to sharpen them all at once and may need to be repositioned and sharpened in sections. I think a good approximation of the overall length that you can reach efficiently with the W.E. is 1-1/2 × the guide rod length. So, with an 8″ guide rod, you should be able to sharpen a 12″ or 13″ bladed knife, clamped in the center of the knife’s blade. W.E. describes the 8″ rods capability at 15″ blade. (That may be for a perfect situation.)
Just to be have full disclosure, the W.E. systems depending on the models are limited in the maximum thickness of the blade they can clamp, also.
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