PK’s observations make sense to me. My comparisons are much more limited, of course.
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I bought a 15” Powermatic thicknesser with spiral head, after years of the cheapest import I could find. I was amazed at the finish quality - I ran a chunk of fir through it and the surface was like glass. My reaction was “why did I wait so long to get this!”
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The PM motivated me to replace the head on my 8” Delta jointer with a Byrd head. That was disappointing. Lots of little scallops. Jointing slower was the solution, but it was not really what I expected.
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I’m satisfied with the spiral head on my A951, but am not looking forward to rotating all of those cutters.
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John Hinman
Boise ID
Kappa 450X and A941