Thread Chasing by Alan Edwards
To a packed audience of members thirsty for knowledge on, what turns out to be, quite a complicated subject. Alan began by explaining the tools and techniques he would use and passed around a drawing to illustrate the theory.
The first method – the hardest – was to cut first the internal ‘screw’ being careful to include an undercut at the bottom and a bevel at the top. Using the same technique he then carefully cut the external ‘screw’ to match. But, and this is a big but, this method is only effective on harder (and more expensive) woods.
A more stable alternative is to use a segmented collar combined with your chosen wood.
The third method, and the one preferred by Alan, is to use a machine of which several are on the market. The one that Alan chose was a jig he had made himself. This produced excellent results. Well done Alan!
Worcestershire Woodturners 