Est. 1998 — 27 years of woodworking knowledge
Planing problems
Tom Meikle
>I just recently had the knives in my JET Model JWP-15CS planer sharpened and replaced. After running a piece of walnut thru, I noticed that the surface finish on the board was "wavey". I took the knife setting guage and fine tuned the blades again along with checking to see if there was any play in the bearings.Has anyone else experienced a problem like this in the past? If so, what do I do to correct it.
Re: Planing problems
Felix B
>Wavy to the touch? Hm, I get that from my jointer - but that's because O move the board too fast. Slowing down the speed usually takes care of that waveness... But in the planer the speed is fixed...
Is it possible your knives are not set to the same hight?
Sorry, not much help here...
f.
Re: Planing problems
Doug in Denver
>When you say wavy, do you mean tiny little ridges - several per inch parallel to the knives, or something else? If that is what you mean, that is probably mimicking too fast a feed rate, which is what will happen if the knives are not the same height and only one is cutting. That effectively doubles the feed rate.
Re: Planing problems
Roger
>Tom
You said that you rechecked the blade height, but if the wave pattern wasn't there before you had them sharpened, it sounds like a high blade is doing all of the cutting.
Roger
Re: Planing problems
Rick Christopherson
>You don't want to use a knife setting jig that rests on the drum. I know this won't make sense to some, but it is not an accurate way to set the knife height. My older model Jet planer came with both a knife setting jig and a fulcrum indicator. When I use the knife setting jig I get similar results to yours.
The fulcrum indicator (or a dial indicator and base) registers the knife height from a fixed position (the bed), and should also be used to set your roller and chip breaker height at the same time.
The drum head appears to be well machined, so I don't understand why knife setting jigs don't work well, but I have seen the same results on both my jointer and planer.