Mother's Wood Lathe Survey
(Page 2 of 4)
March/April 1986
By the Mother Earth News editors
Too, most cast-iron-bed lathes are available with a gap-bed feature—a recess built into the bed beneath the drive spindle which allows inboard faceplate turning of a larger-diameter piece than would fit over the bedways.
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Because the various stages involved in taking a piece of stock from its raw state to a finished product require specific turning rates, virtually all lathes are equipped to operate at three or more different spindle speeds. Generally, these range from 800 to 2,500 revolutions per minute, but the costlier, more versatile machines span a wider range . . . and some offer variable-speed options that allow RPM changes while the machine is in operation. Knowing how your potential purchase is set up is important, because if you're inclined toward working with larger pieces of stock, the machine's spindle speeds should be considerably slower. Another worthwhile feature included in some models is an indexing mechanism, usually built into the headstock. It's nothing more than a lock that allows the spindle to be fixed at any number of equally spaced positions within a complete revolution. Not only does it provide a convenient method of holding the spindle in place while adding or removing faceplates and other accessories, but it's indispensable when you're routing flutes or drilling holes that must be symmetrically arranged.
Look, too, for through-drilling capability if you plan on turning lamp bases or other hollow pieces. Most often, the tailstock spindle will have a center hole to allow right-on-the-button end-drilling; at least one manufacturer includes a larger head stock bore-through as well.
Finally, don't be put off if you find a lathe with all the desirable features, but with a limited center-length capacity. Some machines can be equipped with optional bed extensions that increase the distance between centers considerably. (The Conover lathe is unique in that you can determine the length according to your needs; the metal components are furnished, then it's assembled around buyer-supplied hardwood bed planks.)
TAKE A CLOSER LOOK
The lathe, like any other shop tool, is only as good as the parts that go into it. If one axiom applies to this machine, it's that balance is all-important. Unfortunately, because of knots, wood is seldom uniform in density, and workpieces that have been glued together from different species of wood will be decidedly imbalanced. In either case, the disparity puts a great deal of strain on the headstock and drive mechanism, so it's imperative that both these components are sturdy and well designed.