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01/28/2026 |
Let me establish from the start that many, many methods of sharpening can work. And while I may be courting controversy in my approach, I really am interested in this blog post in discussing how I sharpen, not offering a comprehensive review of all plausible methods. I will also say from the get-go that there is also a big difference between regrinding a tool to a new geometry to repair damage and routine maintenance because of use.
Here is how I am keeping my tools sharp.
Except for one 3/8" spindle gouge ,all my turning tools are made of high-speed steel (HSS). There are gradations of quality of HSS, but in general HSS tools stay sharper longer than traditional carbon steel tools. On the other hand, carbon steel is easier to sharpen. Pole turners have a tendency to want to use carbon steel tools, because such tools are easily sharpened with a stone in the field. Other that that, HSS tools have replaced carbon steel in the marketplace.
One complaint people have with sharpening high-speed steel is that HSS doesn't get as sharp an edge as carbon steel. I would suggest that with modern sharpening equipment such as diamond stones, CBN wheels, and quality waterstones, HSS can get pretty darn sharp. It not so much the steel, which is kind of gummy, but diamond and CBN cleanly cut through the carbide inclusions that are found in HSS.
For the one or two times I've wanted to really change the geometry of a tool, I've used a grinder with a CBN wheel. The CBN wheel isn't essential, but it does mean my chances of burning the tool are nearly non-existent. Many people finish up on a grinder and call it a day, although they are usually finishing up on a much finer wheel (220 and up) than I have (80).
Since I don't have a super fine grinding wheel, in all cases no matter how I get to the ground edge I'm following up the fine and extra fine diamond stone. And then I'm doing one of three things. Leaving the tool as is and getting back to work. Stropping with strop treated with micro fine green honing compound, or polishing on an 8,000 grit water stone. I'm going back and forth between the strop and the 8000 grit waterstone trying to figure out which is better. I don't have an answer yet. I do think however if you have a sharp tool to begin with. a polished edge will cut better and longer.
Since I free-hand sharp everything anyway, I free-hand sharpen my turning tools. Learning to sharpen the handle heavy turning tools took some adapting, but it's the same skill. One of the reasons I'm a big fan of free-hand sharpening regular chisels is once you can free-hand sharpen chisels and plane blades, you can also free-hand sharpen pretty much everything else as well.
When my turning for the day is done, I feel the tool for sharpness. If I'm unsure if it's sharp, it's probably not. I then touch it up on the fine and extra fine diamond stone. And then follow whatever polishing medium is handy.
In the photo above, we have a 1" skew chisel and a 1" continental gouge. You can see the hollow from the grinding. I have a 6" grinder. Most turners prefer a lesser hollow and use 8" grinders. But unfortunately I can't justify a new grinder. The polish marks on the heel and toe of the bevel are the result of hand honing.
I can't emphasize enough how much of a pleasure and a rush it is when I take a tool that was cutting weirdly, sharpen it, put it back on the lathe, treadle away, and get curly shavings.
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The Tradesman might be a fine grinder but I already have a KMG knive grinding setup - but I don't use it for shop projects because 1 - it's in the back 2 - it's cheating. 3 - We use it for lots of stuff an I can't interrupt someone doing a batch.
As for the grinding jig Barry Iles taught me how to freehand grind and I have never looked back.
N.B. I can't really expect people using a treadle lathe to also happen to have an electric grinder.