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I have stayed out of this conversation (maybe I still should!) but here are my observations:

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Spiral vs Tersa may not be as cut and dry as is being stated.

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I have had:

I would agree with everyone around the Byrd version of the spiral head.? I found it to be acceptable, but not impressive with its finish.? Some of this may be tied to the quality and design of the machine.? Vibration will not help in the production of a smooth surface IMHO.

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The Silent Power head was far better than the Byrd head.? Smoother and on the slower speed (AD-941 has 2 speeds) it was pretty glassy.? It was only a 4hp machine, so I assume a larger cut might have affected the quality.?

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The Tersa machine was a 9hp 3ph machine with 3 separate motors and should have made for the best possibility of a smooth surface.? This was a Griggio that was over 1600 pounds with a massive casting, two output feed rollers and variable speed feed rate.? The surface was very good but I would not say it was better than the Silent Power cutter block results.? The machine was a beast for sure and the knives were easy to change- unlock the head, rotate to index it to the whole in the casting, pop the wedges and slide it out.

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The Xylent head on my SCM L'invincible FS 7 is similar to the Silent Power on the AD-941.? The difference is that I now have four speeds.? On the slowest speed, I am not sure you need to sand the wood.? Under an inspection lamp with mahogany you can only see the grain with no machine marks at all!? ?I have had several people to the shop that would agree with me and all of them were blown away at the surface with zero snipe.? This is the heaviest machine by far at 2350 pounds and it is a 15hp machine with almost no sheet steel.? There is very little vibration an very little compromise in design.

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Comparing a machine that has a Byrd, or converted to Byrd (there are other like brands that look similar as a 'basic' insert cutter) to a machine that is of superior design and construction would not be an apples for apples comparison IMHO.? Moving from that style, or a straight cutter, to Tersa on a better machine would be light years better.

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Am I biased because of what I have, maybe, but I have owned all five types in different levels of quality so I feel like I have a good basis to judge them all.

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To really judge the two options would require two exact machines, one with Tersa and one with a Silent Power or Xylent or Xplane to truly compare them.? I have yet to see the results of THAT test.? I only hear word of mouth.? I am a data guy, so it is hard for me to believe without experiencing the actual results.

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As far as the chips that come off the planer, agreed that the index cutterheads have smaller chips.

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PK?

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