We may receive a commission when you use our affiliate links. However, this does not impact our recommendations. The key to good woodworking is to keep all cutters and knives sharp. Also key? Don’t wreck them beyond repair. I held a whole-shop machine tuneup day recently. No work, just a full day of adjusting, cleaning, sharpening, and the like. As part of that I replaced the three knives in my planer, something I hadn’t done in longer than I care to admit. But the change-out was easy and straightforward, and planed surfaces were back to being smooth as silk. But since then, I did something that absolutely ruined them. And here’s the thing: I have no idea what it was. Everything was fine the last I remember. Admittedly, I hadn’t used the planer in a couple weeks, but when I fed some stock just a couple days ago, I got some horrible ridging on the otherwise smooth surface. Take a look below.…