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Ask Dale
Ask Dale is a regular column featured in Woodturning Design. Listed below are the questions and Dale's answers from Issue 16.
Question: In perusing different tool catalogs and websites, it seems that three different kinds of spindle gouges are being sold, not counting “name” lines of tools. There are the “regular” gouges machined from a steel rod, the “Continental” or “European” gouges forged from a flat bar, and the “German” gouges, which I cannot distinguish from the “European” gouges based on the illustrations provided. What would be the different strengths and weaknesses of each profile, and how would I decide what to use without buying one of each and trying them out?

Answer: The “regular” spindle gouges manufactured by Henry Taylor, Crown, Sorby, Hamlet, and others are the popular gouges promoted in the tool catalogs. Most are manufactured from high-speed steel rod, into which the flute is machined. In general, these tools are quite similar in specifications, steel, and price. They always have shallow, rounded flutes and long fingernail ends, which allow most cuts commonly used in spindle work to be accomplished.

A variation of the regular spindle gouge is the detail gouge which is quite similar to the regular spindle gouge, being made from the same steel but the flute is a little more shallow and the detail gouge may be a little more “user-friendly” when cutting beads and coves. The shallow flute permits a smoother cut and the heavier cross section gives less vibration due to there being more metal under the flute. The gouge can be used to reach further over the tool rest without causing excessive vibrations during the cut. It is especially useful for cutting deep and narrow coves.

Another spindle gouge, which can be called Continental, European, or German, is a gouge which has been hammer-forged by hand. Forging aligns the “grain” of the steel, resulting in an exceptionally strong tool. The shallow design and rounded bottom make these gouges ideal for light roughing and spindle turning. These hammer-forged M2 steel tools are ideal for turning hard or dense materials such as antler or stabilized wood, because they have the weight and mass necessary to create smooth, consistent cuts on different materials.

Question:
I picked up a Powermatic 90 from a school sale a while back and have a problem with it. Specifically, I can’t get the faceplate off. I have tried penetrating oil and heat. Any suggestions? I assume it should turn counterclockwise, is that correct?

Answer:Lathes which have been out of service for a period of time, particularly if they have been stored in an area where moisture or high humidity are present, may have the faceplate “frozen” to the spindle due to the cast iron faceplate rusting to the spindle. It’s okay to leave a faceplate on the spindle, but it should be left loose and not tight to the shoulder of the spindle. To remove a “frozen” faceplate, liberally apply penetrating oil, such as WD-40, and let it penetrate for several hours—overnight would be even better. Then lock the spindle securely, place the faceplate wrench on the faceplate, and use a piece of pipe as a “cheater bar.” Slide the pipe down the wrench handle and apply firm, steady pressure. With pressure on the faceplate, tap the faceplate firmly with a hammer. Be sure the pressure is counterclockwise or you will be making it tighter. With steady pressure and a few firm taps with a hammer, the faceplate should come loose. If it doesn’t, exert more pressure and tap a little harder or...“just joking”...get a bigger hammer. Be careful, and don’t break the wrench! The factory wrench is cast iron and will break fairly easily.

A pipe wrench will also do the job, but the jaws will leave marks on the faceplate. But by the time you read this, you will probably have the faceplate off anyway! To prevent future problems with removing faceplates or chucks, I would recommend installing a plastic No-Lock spindle washer available from most turning supply houses. This will make faceplates and chucks much easier to remove.

Question: I’ve had the worst time trying to learn how to sharpen my tools on my bench grinder, so I took the lazy way out and now sharpen my tools on a belt sander at work. I guess I’ve had what I consider extremely good results, because I have not experienced any problems with bluing of the steel or overheating. But I figure there must be a reason everyone uses grinding wheels instead. What is the downside of this practice?

Answer:There are many positive sides to using a belt sander to sharpen turning tools. Good sharpening principles can be adapted to any technique and a belt sander is a very efficient way to sharpen.

A cutting tool should be ground at the lowest possible bevel angle consistent with edge retention. Too wide an angle and the edge will not penetrate the wood efficiently. Too narrow an angle and the edge will break down during use. A belt sander makes it easy to set the angles between two flat surfaces, such as the flat edge of a skew chisel against the flat platen of the belt sander. As a result, it is easier to control the grinding process, and the belt sander will give a flat bevel. It is easy to change grit sizes on a belt sander, but dollar for dollar, a grinding wheel is more cost effective. Another advantage of a belt sander is that scrapers are easy to grind on it. A few years ago, Woodcraft marketed a belt sharpener which was called the Mark IV. It had an adjustable arm with a pocket in which to rest the tool handle for control during sharpening. This unit seemed quite effective. It’s possible a used unit may show up for purchase.

However, there are several downsides to sharpening on a belt sander. The ground bevels on the tools are flat when they come off the sander which makes honing more difficult, and a honed edge will cut better, longer, and cooler than an edge straight from the grinder or belt sander. You don’t get a hollow grind from a belt sander. Some turners prefer a hollow grind, which makes honing much easier since the hone rests on two points of the cutting edge with small amounts of metal needing to be removed from the honed surfaces. Another downside of belt sharpening is the lack of good sharpening guides for the belt sander. I don’t know of any systems for belt sanders. There are several good sharpening systems designed for use with grinders. Most are designed for 8" abrasive wheels. In conclusion, you seem to be doing fine with a belt sander. If it works for you, use it. If your method isn’t broken, there is no need to fix it.

Question:
I just purchased a 1" x 6" white Norton wheel online and it arrived with bushings that are only 5/8" wide. Is this normal, or should they be closer to 1" wide? Secondly, when you dress a wheel, do you keep the corners square or round them over a bit?

Answer:

Any wheel purchased should have bushings equal to the thickness of the wheel. The wheel needs to be supported on the shaft the full thickness, or the wheel will likely run unbalanced and out-of-line. You could contact the manufacturer and ask for a correct bushing, or you could make a replacement bushing yourself.

A new bushing could be made from a nylon rod or a block of hardwood which could be chucked in the lathe, and a 5/8" hole drilled through the stock. This hole must be accurate and fit snug on the grinder shaft to ensure the wheel will run true. To turn the outside of the bushing, turn a cylinder large enough to fit securely in the chuck jaws and about 2-1/2" to 3" long. Now, turn a tenon about 1" long and 5/8" in diameter. The final fit should allow the bushing to slide onto the tenon. The fit should be snug so the bushing will not rotate on the tenon while the outside is being turned to fit inside the wheel opening. Easy does it! Remove small amounts of material until you get the fit you want. Try the wheel on the bushing until you are satisfied with the final fit. Now check the bushing length. It should be about 1/16" less than the wheel thickness. There should not be any looseness in the bushing when it is installed in the wheel or on the grinder.

When a wheel is dressed, every effort should be made to keep the cutting face flat and square. Do not round the corners over or that part of the wheel cannot be used for sharpening the tools. Rounding the corners effectively reduces the width of the wheel for sharpening purposes.
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