One of my favorite woodturning mentors, the late Bill Jones, endeared himself to me many years ago with his answer to a turning question during a seminar. These are best used for something like scooping out the saddle of a chair seat. There are draw knife type tools that have the curve bent into the blade so it forms a cylindrical shape.
By the way, I’m assuming the curve is along the horizontal plane of the blade, like a sweep. Generally, a curved knife for me will do deeper cuts or bark removal easier than a straight blade. As you say, sometimes it just doesn’t actually make much difference. If you have a choice of tools, you’ll discover that you like one for this job and another for that job the subtle nuances might become important. Sometimes we don’t have a choice so we learn to “make do” with what we’ve got. Tim Inman: The short answer is “convenience.” We select tools that are best suited to the jobs at hand. I have used both but see no real difference in my limited use at this point. What is the difference between a straight draw knife and a curved draw knife, and why is one used over the other? Is there a particular application or process where a curved draw knife is preferable to a straight knife? I own both versions in excellent condition through a lucky antique store visit.
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