Roger Shoaf wrote:

"Seems to me that using a wooden screw for a vise is something you would do
if metal were not available. The only time I have seen wooden threads is on
broom handles painting poles and that is the usual point of failure."



I've seen such threads on "decorative" nut crackers. It's a wooden cup, roughly the size of a coffee cup, for the nut, and a wooden threaded ram for cracking the nut.

Can't help with the wood type however.