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Full Length Internal Tube Threading

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  • Full Length Internal Tube Threading

    I have a tube 11.5x1.25x.065 wall Ti 3Al-2.5V I need to put a 28 tpi end to end.
    My thoughts are mount it on my lathe and use a boring bar between centers to cut it.
    I never trust a fighting man who doesn't smoke or drink.
    William Halsey

    As a Machinist & Gunsmith I like to hear how to not can't do. P.A.R.

  • #2
    I've used something like that and it can work. Plan for a way to either measure the amount of advancement of the tool with each resetting, or some way to advance it with precision. This is one approach from an article in Model Engineers' Workshop. Two different bars so parts don't match but the basics are the same.



    .
    "People will occasionally stumble over the truth, but most of the time they will pick themselves up and carry on" : Winston Churchill

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    • #3
      Design of tool feed was next thanks.I was thinking of using a 15%cobalt HSS with flood coolant.Thanks
      I never trust a fighting man who doesn't smoke or drink.
      William Halsey

      As a Machinist & Gunsmith I like to hear how to not can't do. P.A.R.

      Comment


      • #4
        Originally posted by P.A.R.
        Design of tool feed was next thanks.I was thinking of using a 15%cobalt HSS with flood coolant.Thanks
        An interesting and easy-to-set-up way to feed a between centers boring bar using a boring head in the headstock spindle is mentioned in post #4 here:

        http://www.woodworkforums.com/f65/us...ng-bar-129635/

        I have not yet tried it myself, but cannot see why it would not work for boring if there is not a lot of material to remove. For cutting a thread the disadvantage would be that the angle at which the tool is presented to the work will change very slightly slightly with each cut, but this would probably not matter with a thread as fine as 28 TPI unless great precision is required. If the tool is in the center of the boring bar it should advance by about half the reading on the boring head for each cut.

        franco
        Last edited by franco; 09-23-2011, 11:41 AM.

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        • #5
          No super precision its a suppressor tube "Legal" I'm glad I have found this sight Being a Machinist and Gunsmith I like to hear how to not cant do.
          I never trust a fighting man who doesn't smoke or drink.
          William Halsey

          As a Machinist & Gunsmith I like to hear how to not can't do. P.A.R.

          Comment


          • #6
            Originally posted by franco
            An interesting and easy-to-set-up way to feed a between centers boring bar using a boring head in the headstock spindle is mentioned in post #4 here:

            http://www.woodworkforums.com/f65/us...ng-bar-129635/
            Here's a link to a thread on this forum where I did a similar process. It worked great! I've been itching to use it again but the opportunity hasn't presented itself yet.
            http://bbs.homeshopmachinist.net/sho...ight=LINE+BORE
            Milton

            "Accuracy is the sum total of your compensating mistakes."

            "The thing I hate about an argument is that it always interrupts a discussion." G. K. Chesterton

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