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Thanks for all replies, I have figured out it is not a heat treat problem. It's a problem with the die. As I said above, the first try was a piece of cold worked medium C steel. It actuall bent when i screw cut it on the lathe. But after reviewing my pile of junk leadscrews. I noticed the bend...

I have done more tests. First I raised temp to 950C and held it there for 15min. Cool in air. Material still warps badly when cut with a die. Second test was heating to 950C, hold time 15m, and cool slowly over night in the furnace (annealing). Still warps badly when cut with a die.

Gentlemen, I have no idea what I'm doing wrong. I am converting an old Palmgren milling attachment to a metric configuration. I need to make a 3" lead screw for this. I have chosen 8x1mm thread. Doing this I first tried a piece of LaSalle cold rolled material. It's called Stresseproof or...

Come to think about it, there is at least one channel on YT about just this. A channel called NYCCNC chronicles a home shop machinist in NYC who starts out working at home in his apartment, and now has his own full size CNC business. https://www.youtube.com/user/saunixcomp/about

Depending on the size of lathe chosen a machine with milling/shaping capabilities can be a necessity. Smaller lathes like Taig and Sherline are useless millers without a milling column. Faceplate work is not at all as common or useful on a small machine like this, as it is on a standard 3.5" ME...

I used to live in apartment where I had my workshop spread out all over it in fact! For a lathe I had a Sherline 4410, and I can recommend it 110%. It is very quiet and easy to work with. Also Sherline has a huge selection of accessories. Get a long bed even though you don't think you'll need it...

Do you use that dial test indicator holder as a length stop as well? The whole set up is very classy, I've been thinking of doing something like this to my machine too.