I had done some posts on the possibility of single point threading in the other thread on using a mill and lathe and decided to test the idea.
First and second pictures show a single point lathe threading tool simply held in the vise being used to turn a piece of 3/4" brass slightly undersize with an undercut at the end.
Third picture shows the finished thread.
Fourth picture shows a nut screwed on; thread is 3/4"-10.
I got the size a bit small but it is not a bad effort for 20 or 30 minutes of playing around.
Obviously my concerns about chipping the insert were unfounded.
Here is the code:
%
O00000 (THREADING)
N1 G00 G20 G40 G49 G80 G90 G98
N2 G53 G00 Z0.
N3 (-----)
N4 T1 M06
N5 G43 H01
N6 S1000 M03
N7 G54 G00 X0. Y0. Z1.
N8 Z0.1 M08
N9 G84 Z-1.2 F100. R0.1 L1
N10 X0.005
N11 X0.01
N12 X0.015
N13 X0.02
N14 X0.025
N15 X0.03
N16 X0.035
N17 X0.04
N18 X0.045
N19 X0.05
N20 X0.055
N21 X0.06
N22 X0.065
N23 X0.07
N24 G00 Z1. M09
N25 (-----)
N26 G53 G00 X-8. Y-4. Z0.
N27 M30
%