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Streak Marks After Rotating Spiral Cutterhead Bits
Question
Forum Responses
Once again, it is a real pain. We sold our 4 sided knife machine 2 years ago and went with the 2 sided industrial rectangular knives. Significant improvement and no line issues.
From contributor K: Contributor T is right, you need to clean every bit of anything foreign on the head and the knives. Just a speck of dust under the insert will cause streaks. It took me about 6 hours to do our machine (24" with a million knives). Of course that was the second time because the first time I was not careful enough and had the same problem you are having. From contributor J: Yup, very common. When you first get your head, it's factory set. As soon as you rotate them, you get the lines. Cleaning everything helps but you will still get those lines. You could send it out to get jointed, but that would defeat the purpose of having changeable (4 sided) inserts. Finding someone to do that might be hard, but until then, welcome to the lines. From contributor S: Yes, it is quite common. The bits are not in the same cutting circle. For spiral cutterhead, it is quite difficult to set all bits properly. Even the manufacturer will take hours to set one cutterhead in their factory. From contributor W: I'm getting the same thing on a Woodmaster 725. I thought it was the aluminum spiral head that came with the machine. I've gone to re-planing the boards on a Jet planer with straight knives to remove the streaks, but this isn't an option on boards over 15" wide with my setup. I now use the 725 to just size rough lumber down and live with the streaks in our situation. Lots of sanding on wider materials. Thanks for the info. Would you like to add information to this article? Interested in writing or submitting an article? Have a question about this article? Have you reviewed the related Knowledge Base areas below? 
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