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Warco GH1236 screw cutting 1mm pitch threads

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Warco GH1236 screw cutting 1mm pitch threads

Home › Forums › Manual machine tools › Warco GH1236 screw cutting 1mm pitch threads

Viewing 4 posts - 1 through 4 (of 4 total)
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  • 24 January 2024 at 17:02 #709786
    william short
    Participant
      @williamshort73832

      Hello Members

      I have a Warco GH1236 Lathe but i cant find the correct information to screw cut 1mm pitch threads.

      The Indicator table doesn’t show what indicator gear to use ie not 14T 15T or 16T  it shows 0T. Also the for the indicator dial engagement number it shows “/” not ie 1-8  1*3*5*7 etc.

      1mm pitch is a popular size so it must be me who is not understanding.

      Can anyone help me with this.

      I will try and attach a picture of the table.20240123_132038

      Thanks William

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      24 January 2024 at 17:13 #709809
      JasonB
      Moderator
        @jasonb

        Assuming it is a metric pitched leadscrew machine then you don’t need the dial if the leadscrew’s pitch is divisible by what pitch you want to cut.

        So if you have a 3mm pitch lead screw you won’t need the dial to cut 1mm or any of the other pitches along the bottom row as 3 can be divided by all of them. Hence the 0T and / indication nothing.

        24 January 2024 at 18:15 #709838
        DC31k
        Participant
          @dc31k

          Just to amplify on the above, not needing the dial means you can engage the half nuts at any point that they drop in freely and the thread will synchronise.

          Maybe the table would be clearer if it said ‘any’ for the gear and ‘any’ for the scale (just like the ‘any’ key on your keyboard).

          Martin Cleeve’s ‘Screwcutting in the lathe’ explains this very well (section 5 entitled ‘problems and analysis of repeat pick up’).

          25 January 2024 at 15:26 #709967
          william short
          Participant
            @williamshort73832

            Thank you Gentlemen.

            1. My misunderstanding was I somehow thought the lead screw was 8TPI.( I think I have been reading too many American manuals for this lathe). I have measured it and it is indeed a 3mm pitch lead screw. I have ran several test cuts with different dial gears and at random engagement points and it repeat cuts correctly. So your suggestion of it should say “Any”  “Any” is the best simplification.
            2. Also to my shame. I have checked and I do have a copy the Martin Cleeve book Screw Cutting In The Lathe. So I will be reading it from cover to cover.
            3. Once again thank you both for your generous help
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