I recently upgraded my PM 60 Jointer which is about 30 years old to the Byrd Shelix head, and I also purchased a used Delta DC380 and had a Byrd head installed in that as well.
Impressions.
Scalloping. The heads definitely leave a very minor scalloped cut, but sanding that out is not a problem.
Tear Out. The finish is free of tear out in most circumstances. Wood that is not very sound combined with tricky grain can still cause some tear out. I am looking at piece of curly maple right now that I ran through and there is zero tear out. I still run anything particularly crazy through the drum sander.
Overall Finish.
The heads produce a finish that is free of tear out most of the time regardless of grain direction and requires minimal sanding. I have put over 1000 board feet through both machines so far, and the finish is the same as when the heads were brand new.
If you plan to apply finish right out of the planer, which is sometimes appropriate in production work and finish carpentry the scalloping may be a problem. However for most work, a planer shouldn't be used to produce a finished surface anyway, and I find quite a bit less sanding is required, then when I ran conventional knives.
Noise Levels.
The noise levels while cutting, are not much louder than the running noise of the machine, dust collector, etc... I still wear hearing protection, but the reduced noise levels are very nice.
Would I do it again?
Yes and no. I enjoy having the head in the planer, and wouldn't go back. I could see having two jointers, one with and the other without.
With the jointer, it takes extra effort to feed the board, which when milling long rough stock this becomes apparent. If I could only pick one I would still go with the Byrd Head on the jointer. If I buy a second larger jointer, I may opt for conventional or tersa knives.
I feel the investment was worthwhile, and I am very pleased. Tersa, and other systems with indexable knives are worth considering as well.
Conventional knives are easy to change on a jointer at least, since you can work above the table, and a planer gets used to remove more material so I would give priority to a planer.
Last edited by Michael Schwartz; 07-16-2010 at 11:46 AM.
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