The following is excerpted from Peter Galbert’s “The Chairmaker’s Notebook.” Whether you are an aspiring professional chairmaker, an experienced green woodworker or a home woodworker curious about the craft, “Chairmaker’s Notebook” is an in-depth guide to building your first Windsor chair or an even-better 30th one. Using more than 500 hand-drawn illustrations, Galbert walks you through the entire process, from selecting wood at the log yard, to the chairs’ robust joinery, to applying a hand-burnished finish.
Turning is a form of carving, and as such, there are many similarities to the tools you might use in standard carving, although the sharpening geometry is different. Whenever my turning skills seem to let me down, I often look to the shape and condition of my tools. The correlation between well-tuned tools and turning success cannot be overstated. I usually see this when I hand a well-tuned tool to a student who has been struggling with a poorly tuned one. The improvement is usually immediate.
This chapter covers the tools that I find most helpful in turning and the way I maintain and use them.
Tool Condition
New turners often underestimate the dulling effect that cutting will have on the tools. Turning tools show a distinct change in their usefulness as they dull. The dull tool will resist taking a light cut. The extra pressure required will tend to increase vibration while limiting the range and fluidity of motion. This is a recipe for a bad experience.
Most modern turning tools are made from high-speed steel. High-speed steel retains an edge longer and is less prone to losing its hardness during grinding. The downside is that high-speed steel is more difficult to get as sharp as regular high-carbon steel. But for me, the extra edge life is worth it. High-speed steel encourages grinding because it isn’t damaged by overheating until it reaches red-hot. If it does get red-hot, take that as a sign that you are being too aggressive. Let the tool cool (don’t quench it in water because this stresses high-speed steel) and, as remedies, lighten your grinding pressure and perhaps dress the wheel.
Many production turners conclude their sharpening process at the grinder. They use a light touch and frequent grinding to keep a sharp edge. I like the idea of this because it encourages grinding and sharpening in general. It stresses getting back to work instead of fussing with honing. But I hone most of my tools after grinding to get the edge as smooth as I can to leave a scratch-free surface on the work.
The dulling effect can be difficult to imagine; after all, sometimes you use the tool for only a minute or two. That’s hardly a problem with a plane or a chisel. But would you ever consider carving hundreds of linear feet with a carving gouge between sharpenings? Many turners ignore the length of their cuts and do just that. Imagine a 2″-diameter round spinning at 800 rpm; after 30 seconds of cutting, more than 210 linear feet have passed against the edge! Of course, by using different parts of the cutting edge, the tool can go longer between sharpenings. But for the new turner, focusing on getting one part of the tool to cut is usually tough enough. So tool maintenance becomes even more imperative.
Oftentimes a slight burr or a damaged edge on a tool won’t just leave a dull spot, it will send the tool skittering down the work or chew it up. This is especially evident when using the skew. When entering a V-notch or any cut where the skew starts cutting immediately upon contact, the slightest deformity on the edge will prevent the tool from taking a bite.
Also, when the skew gets dull, taking a cut when the tool is presented straight on to the work becomes more difficult, so the turner usually shifts the handle far to the side to get more of a slicing cut. This makes it tougher to resist the force of the turning piece. Because the support for the tool is too far to the side, the skew is easily dragged down the work, resulting in a catch.
One essential tool that is most often neglected is the tool rest. A pitted or dinged-up tool rest will make smooth turning nearly impossible, and most new turners assume the problem is with their technique. A well-polished, smooth and waxed tool rest is essential to good turning. I take a smooth file to my tool rest and hold it perpendicularly as I draw it along, taking a fluid cut. After the surface is level and free of defects, I polish it with stones or fine sandpaper. Then I wax and buff it. The tool should glide easily. Any tools that have sharp corners, such as parting tools and skews with rectangular cross sections, should be eased with a buffer or sandpaper.
Turning Tools
As with most woodworking, it is easy to confuse having more tools with having more ability. More important than having lots of tools is knowing when and how to use them. Talking about tool choice and shape can be contentious in turning circles, much like discussing politics at a holiday dinner, but here is my take.
My basic turning kit contains a 3∕4″ roughing gouge, which does most of the heavy shaping; a 1∕8″ diamond parting tool for sizing diameters; a 3∕4″ oval skew for finishing all of the surfaces except the coves; and a 3∕8″ detail gouge for getting into coves and roughing out beads. The size of these tools can vary with personal preference and the scale of turnings that you are making. Getting the most out of each one and limiting the number of times that you switch tools helps to achieve consistent results.
With these four tools I can perform all of my turning tasks; more importantly, by limiting my collection, I keep all my tools in top condition with ease and know exactly which tool to turn to at each step.
I also use a couple of other tools that make my life easier (I’ll mention those as we go), but to make these chairs, the four core tools more than suffice.
The techniques you use at the lathe will dictate the shape of your tools’ edges. Every turner has favorite shapes; I am no exception. I’ll share my angles and shapes below, but keep in mind that the key to turning tools is the degree of sharpness and maintaining flat bevels. Any rounding over of the bevel will encourage you to over-rotate the tool to engage the cutter, which makes the tool difficult to control. To aid with the flat bevels, I use hollow grinds on all of my turning tools. The only exception is on the inside of the gouges, where a slight rounding can be tolerated.
For all of my sharpening, I like to keep the process fast and simple to encourage me to do it. Ensuring that sharpening is fast and easy is vital to actually stepping away from the lathe to do it.
Further information on the techniques in using these tools is in the Turning Practice chapter and information on the lathe and its accessories can be found in The Chairmaker’s Workshop chapter.
The roughing gouge
I use a 2″ gouge for turning blanks to round and a 3∕4″ gouge for roughing out my shapes. The larger gouge isn’t necessary, but it does make roughing more comfortable.
Before I reshape a new gouge, I polish the inside to remove any milling marks. I use a diamond cone-shaped hone, sandpaper on a dowel and diamond paste on a dowel to polish the flute. I grind a 35° bevel (or so) on my gouge. Just as important as the angle and condition of the edge is that the profile is straight. This keeps the cuts fluid and predictable. If the edge is crowned, rotating the tool during cutting will advance or retract the cutting edge, which adds another variable.
While grinding the gouge is possible to do freehand and with a simple tool rest, I use a jig to get consistent results. The set-up time with the jig is quick and doesn’t deter me from grinding.
Once the bevel is ground, I use small diamond-impregnated paddles to hone the bevel, then I remove the burr with the diamond hone. Sometimes I turn the burr from the inside of the flute with a leather strop.
This isn’t a finishing tool, so I don’t go too far with the honing. I always like to keep the flat at the edge small to prevent rounding during honing. I hone only three or four times before going back to grinding.
The diamond parting tool
I like a diamond-profile 1∕8″-wide parting tool. The tool is widest at its cutting edge, which reduces binding, and the tool’s small kerf reduces vibration. I don’t hone this tool because I use it only for sizing diameters, and I grind it too often for honing to be practical. To grind it, I don’t even set up a tool rest. I shoot for about a 50° inclusive angle. First, I set the tool on the top edge of the tool rest and lower it until I make contact with the heel of the bevel, then I lower the tool on the wheel until it makes full contact. I repeat this for both sides, taking care to keep the edge at the widest part of the tool’s spine and straight across. When I have turned a burr, I stop grinding and tap the edge into a softwood block to knock the burr off and get back to turning.
The oval skew
I prefer an oval skew, which seems to move more fluidly and doesn’t ding up my lathe’s tool rest. It’s a personal choice. I sharpen it at 30° inclusive (15° on each side) using a standard tool rest on my grinder. I don’t have any trouble grinding it this way, even though the shaft of the tool is an oval. I simply focus on keeping the edge horizontal; once it is hollow-ground, it registers on the wheel. I also shape the edge to a subtle curve. I like the exceptionally light cut that this curve allows, plus the toe and heel of the edge are somewhat pulled back, making catches less likely. I achieve this curve by pivoting on the tool rest while grinding.
It’s important to keep the two bevels ground equally. Once I’m satisfied with the grind, I hone the tool by pulling it on my stones just as I would a chisel. If the edge is curved or you are using an oval skew, you will roll the tool slightly to make sure that the entire edge is honed. Don’t confuse this with lifting the tool so that the back edge of the hollow grind loses contact. This is the worst result and will round the cutting edge over, dubbing it like a drawknife. Having a flat facet behind the cutting edge is essential to good skew technique. I never strop this tool, and I hone it on my finest stone in between turning each chair leg to keep it at peak sharpness.
When the facet behind the cutting edge gets wider than 1∕16″, I hollow grind again.
The detail gouge
I first polish the inside flute of the detail gouge (as I mentioned above) before regrinding it to a fingernail profile with a commercial jig. The jig comes with instructions for grinding the correct shape. For a long time, I avoided investing in a jig to make this grind, but after using one, I realized that my results doing it by simply rolling the tool on the tool rest while swinging the handle side-to-side did not give as consistent a result. I usually resist sharpening jigs, but I’ve found the consistent results worth it in this case.
The shape of the curve at the end of the flute should be even. I grind the detail gouge at 35° and finish the honing the same as with the roughing gouge. I keep this tool in top shape to reduce chatter and the chance of catches. Like the skew, this tool performs best when most of the bevel is made up of the hollow grind, so I grind again after only a few honing sessions.
To those new to turning, there are many details to consider, such as the speed of rotation, the size of the workpiece, the heft of the lathe and the details to be turned. Tool condition is one variable that you can always control. To achieve this, you must become proficient at the grinder. In the last 15 years, I’ve had the same iron in one of my favorite spokeshaves, but I’ve replaced most of my turning tools at least once. While they aren’t cheap enough to think of as disposable, I never confuse their cost with the value of a pleasant turning experience.
In addition to the turning instruction in “Chairmaker’s Notebook,” Galbert offers instruction through the video “Spindle Turning for Furniture.”
What does “dubbing it like a drawknife” mean? As someone who regularly uses a drawknife to process green stock I feel like I should take offense to the phrase, I’m just not sure exactly how.