I'm working on a project that requires lifting a 10 lb load vertically using a lead screw (threaded shaft ... I'm interested in your double-checking me! Thanks in advance.

Split nuts are just what they sound like — an internally threaded element that has been split lengthwise and can be opened and closed around a lead screw. This is used to advantage in thread ...

As [Clough42] points out, most lathes couple the lead screw to the spindle drive through a complex series of gears that need to be swapped in and out to accommodate different thread pitches ...