Turning

Subject:
Re: Threaded boxes anyone?

David Walser
Allow me to add to Reed's sage comments: Few domestic hardwoods are well suited for chasing threads. There are four ways of dealing with that limitation (that I'm aware of):

1) Use a threaded insert. You can use a short length of a tropical hardwood to create matching male/female threads, and then insert the sections into your box. You can also use PVC pipe (either threaded pipe fittings or short lengths of pipe, which can be easily threaded using chasing tools).

2) Stabilize the domestic hardwood before threading. This can be done using Cactus Juice or a similar resin. It can also be done by repeatedly flooding the surface of the wood to be threaded with thin CA. With the CA option, you'll need to reapply the CA as you go. It doesn't penetrate all that deeply.

3) Segment a ring out of domestic hardwood and use that for threading. You can either make the entire box as a segmented project, or you can, as with number one, use the segmented ring to make a threaded insert. This works because domestic hardwoods take threads well in their long grain. It's only the short grain that's a problem. By segmenting, you can have the entire circumference of the ring be nothing but long grain.

4) Use a jig. As Reed suggests, powered threading cuts the threads so cleanly that the short grain sections of domestic hardwoods don't break-out (as often as they would when chasing by hand).

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