Wood shapers look very scary to the uninitiated. They are large, complicated looking machines that can make a newcomer think twice about working with wood. However, once familiar with how it works, you’ll be fine. Basically, a wood shaper is a kind of “super router.” It has a shaped cutter set on a vertical axis, that can create some very complex shaped sections in wood. It uses cutters with a 1/2 or 3/4 inch hole in the middle instead of a 1/4 or 1/2 inch shaft like a router bit, but it may also have an adapter available for it to allow it to use router bits.
A shaper has a spindle (a rod) which protrudes through a large hole in the table. There is height adjustment of the spindle and an adjustable fence to carry the material past it. A slotted metal block (the “head”) goes over this spindle and there are two or three shaped knives bolted into it. The knives are replaceable and come in many shapes and sizes. A big advantage of spindle shapers is that knives are simple and cheap to buy compared to router cutters.
A typical wood shaper has a few heads and many knives. One head will be a multi-purpose head to take different knives, others will be specific to a particular knife set. As head diameter varies, the table usually has a large hole in it and a set of filler rings to block it up to make it as small as possible. This acts a bit like a drill chuck, which allows the use of different knives of varying sizes.
Due to the dangerous nature of these tools, it’s now necessary for all heads to meet three strict requirements. One, they must have positive locking for the knives. This is most often in the form of a pin that goes through the knife. Two, the knives must also have cut limiters so there is a limit on how deep each tooth can cut. Three, the heads must be lightweight so that the machine won’t keep spinning for ages once disengaged. Some wood shapers will use aluminum heads and others use brakes to achieve this.
The fence and guards normally permit hand-feeding of material in home or hobbyist environments. Some production environments use a power feeder which are rollers on a movable arm. These are excellent, especially if they have variable speed control. The amount of fitments, knives and other devices will vary depending on the model purchased.
Wood shapers aren’t as popular as they once were due to the need for significant experience to be able to use them well, and the advent of large router tables. That said, there is definitely a place for them in the modern workshop as they utility is undeniable. Proper training and instruction is vital and careful use is more important on this machine than any other in the shop.