ORNAMENTAL TURNING (5)

摘要

The old tried and tested method devised by J. H. Evans over 100 years ago is probably as good as any. This type has plain bearings at each end of a long spindle to provide maximum stability. When it was first invented in the mid-19th century, the instrument was a screw-on attachment for the already existing Drilling Spindle (see photo 1). This idea worked quite well for a while, particularly on those with short heads (with a maximum cutting radius of one inch) but it was said that the heads became inaccurate through wear on the screw thread from the head being screwed on and off. This problem was overcome by forging the head and spindle from one piece of steel. The forging may be done by a blacksmith or, if this service is not available, two parts silver soldered or glued together with heavy duty Loctite should be sufficiently rigid.