John Goff
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The Oval Frames - Main Page | Producing a Frame | How the Lathes Work | Talk to the Artisans |
| How an eccentric lathe works - 3 | |||
| When eccentric mechanism is vertical, the collar plate centers' the outer plate and the faceplate. | When mechanism is horizontal, collar forces the faceplate 'off center,' while cutting tool remains at same distance from center of spindle. | ||
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D. The eccentric mechanism consists of three plates keyed to each other along perpendicular axes.
The collar fits over the ring on the headstock, and the outer plate is a flat surface
to which the faceplate is attached. The center plate is screwed to the lathe's headstock
spindle - turns in a circle and acts as an idler on which the collar and outer plate can move.
As the lathe turns, the collar is forced to move in relation to the center plate, as shown
above, so the path of the faceplate is an ellipse.
John Goff
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