Eric Holmquist
02-03-2014, 10:54 AM
Playing around with thread chasing has me struggling with a basic internal design issue.
If I allow for 1/8" of wood behind the threads, and 1/16" for the thread interface, whichever half of the box that contains the male threads will have to allow for at least 5/16" of wood at the joint, and you probably end up closer to 3/8".
If the male threads are in the base, this makes for a very thick walled box especially if it is a small box, yet most thread chased boxes I have seen have male threads on the base piece. I can understand why, this way, nothing inside the box can damage the threads.
If the female threads are in the base, the wall thickness ends up being around 3/16", which seems both more asthetically pleasing, and less intrusive, but seems to put the threads in jeopardy of damage from stuff in the box.
Since part of the turning process uses the threads as a drive center, I am hesitant to go much thinnner.
A threaded insert would seem to make matters worse as you need some wall thicknesss outside of the insert.
I am curious how anyone who has played around with thread chased boxes has delt with this issue.
If I allow for 1/8" of wood behind the threads, and 1/16" for the thread interface, whichever half of the box that contains the male threads will have to allow for at least 5/16" of wood at the joint, and you probably end up closer to 3/8".
If the male threads are in the base, this makes for a very thick walled box especially if it is a small box, yet most thread chased boxes I have seen have male threads on the base piece. I can understand why, this way, nothing inside the box can damage the threads.
If the female threads are in the base, the wall thickness ends up being around 3/16", which seems both more asthetically pleasing, and less intrusive, but seems to put the threads in jeopardy of damage from stuff in the box.
Since part of the turning process uses the threads as a drive center, I am hesitant to go much thinnner.
A threaded insert would seem to make matters worse as you need some wall thicknesss outside of the insert.
I am curious how anyone who has played around with thread chased boxes has delt with this issue.