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Would you like to add information to this article? Interested in writing or submitting an article? Have a question about this article? Why Planer and Jointer Knives can Lose Their Straightness 
Question
A bad knife sharpener is what we could all agree on. Our old sharpener took several sets back and re-sharpened the knives with no charge and even bought us a new set of each. Recently I decided to check out a new set (Freud 20" planer knives) and they were pretty crooked. Do my question is this - is this standard? Our knife-setting jigs can't really accommodate for this feature. How do you go down the knives trying to bend the s-curves out? Forum Responses
From contributor R: WKW or Schmidt knives can bow over time with the grinding releasing tension in the metal. I have several sets of each and other high grade blades. It's a natural occurring thing in steels. When I was doing metal-smith work this is something that was very common when cutting and working with any metal. From contributor P: It is more convenient for them to be straight, certainly. I have 4 Leitz blades for my Griggio, and one has a bow. It just means more of an effort to replace it in the block after sharpening. I think s-curves are pushing it a bit – I wouldn't accept that from the supplier.
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