Last issue I described how to make a tap to produce large threads in wood. Traditionally, this tap would have been used to make the matching threadbox, with which to cut the external threads of wooden screws. Pairing the two would be a great ‘low-tech’ combination, but unfortunately, Australia is not blessed with an abundance of woods which thread well by that method.
There are some, most of which are not easy to obtain in the dimensions required to make large screws, and in any case, threadboxes are quite challenging to make and maintain. However, many of our hardwoods can make excellent screws, and the way to get them to cooperate is to use the cutting ability of a high-speed router bit. With the help of a simple jig, you…