Acme Screw Thread Profile by Wizard191 CC-BY ... This is used to advantage in thread cutting operations, which the split nut closes around the lead screw at the start of thread cutting and opens ...
The table is not all wood, of course; metal bushings and pins are used in the scissor mechanism, and the lift drive is a stout Acme-thread screw and nut. We’re impressed by [Marius]’ joinery ...