How to Cut a Fine Thread on a Lathe (Training Film)

Open Source Machine Tools
Open Source Machine Tools
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Published 2013-09-10
A detailed guide to cutting a fine thread using a lathe, from a U.S. World War 2 training film. For more about the open source machine tools project, please go to www.opensourcemachinetools.com/
All Comments (21)
  • @dominicbianco3826
    What a nice looking machine. The old machines seem to have a charisma about them.
  • @rjmars1
    Ah a reminder of my youth. I've sat thru every one of these training films. I can still hear the metal shop teacher saying ya see that guy he's a dumb ass ya know why he's not wearing safety glasses. Then pointing to the paddle on the wall if I catch you with out your safety glasses I'm going to bust your ass got it. A few didn't believe it. They found out they were wrong. Yea that was a long time ago before they made pussies out male children. 
  • @gresvig2507
    I love the modern world. This shows up in my YouTube feed and I find out about how they did the cross slide stop. Thought that hole was for lubrication. I've got an almost identical lathe (LeBlonde 13") that was originally from Camp Lejeune. Random connections after 75 or so years are awesome.
  • @mikeadrover5173
    Thanks just got my first lathe I’m a woodworker. However I just got my first 13 inch Logan Lathe circa 1945 or before. These-old training films built this country and ended WWII. If it worked then to teach master machinists, it does so today!   As always, thanks’ for taking the time to show this video! ~M~
  • @constitutionalradiation3587
    They did make one mistake. One, generally, never takes the part out before the threads are done. In a perfect situation one may get away with it, to spin the nut on, but they didn't mention making sure the drive dog was placed against the same side(the driving side) of the face plate slot, it could make quite a timing difference. In real life, a steady rest is used in production with the end hanging free to test with the nut.
  • @georgiojansen7758
    when I moved from indonesie to holland these movies were magical to me
  • @scheppach69
    A nut made in New England will fit an axle thread in Michigan, wow thats a long nut!
  • @guyward5137
    Really enjoy the training firms from the early years. Always short and to the point. Would of liked living in those days did you notice that guy never stopped to post on Facebook. Lol. Just kidding you. I know that there was no Facebook then. You actually had face to face conversations with your friends
  • @andyvan5692
    nice video, very detailed, BUT there was a missed step, the faceplate, which drives the work has 4 slots, as the work is removed to clean/inspect the thread one MUST mark the slot in which the drive dog went in!!- this keeps the angular position of the start of the thread in the same spot, and allows use of the same index line on the chasing dial.
  • @billybonewhacker
    I worked in a shop where they still cut threads simular to this. they made parts for old gas compressors. but they would twist sand paper at the end of the job and polish the threads. lathes havd to be kept in good condition for thread work, out of condition lathes hav to much slop in the gears for good threading. they also had a thread roller but that is another story.
  • @millomweb
    10:35 The extra thou cut was not caused by the spring and give in the tool and work. It was caused by moving the compound 3 thou AT 30° - which is less than 3 thou on the cross slide. 3x cos(30°)= ~2.6. So that'd leave 0.4 left to take off.. so another 0.5 thou cut should do it (IMMIC)
  • @wiliiz2492
    Someone please tell me the make of this lathe