I'm a [very old] newbie who has finally saved enough pennies to set up a small shop for tinkering the rest of my daze. [Equipment to date: 15" x 50" Harrison lathe, Acer mill with 10" x 50" table, Powermatic 20" vertical bandsaw, etc.] Now I'm starting to make tool holders for the lathe. In his book "The Amateur's Lathe", L.H. Sparey strongly recommends a 'spring' threading tool. On page 82 of the 1987 reprint, he says "... well-informed persons have gone so far as to say that it is the only tool by which perfct threads can be cut in the lathe." QUESTIONS: Is he correct across-the-board? Or does it apply just to smaller lathes? Or lathes made back when he originally wrote the book in 1948? Or easily-machined materials? BOTTOM LINE: should I make this type of tool for threading on my Harrison 15 x 50 ... in primarily CRS, O-1, aluminum, and 4130?
THANK YOU for your advice and guidance. Tom