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  1. #1
    Join Date
    Feb 2022
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    Barongarook
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    57
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    Default Thread cutting on L565D lathe

    Hey folks, new member 1st post. Trying to cut 28TPI thread on my lathe,got a 42 tooth gear to adjust gearing to cut correct thread but can't get a thread indicator table to suit this set up. Machinery warehouse have contacted the lathe manufacturers, but being chinese new year, no luck. I have to use this particular thread as it has to match the already purchased muzzle brake.

  2. #2
    Join Date
    Oct 2011
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    Norwood-ish, Adelaide
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    59
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    6,540

    Default

    Has your lathe got a metric leadscrew or imperial?

    Michael

  3. #3
    Join Date
    Feb 2022
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    Barongarook
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    Default Thread cutting on L565D lathe

    Thanks for the reply I have a metric leadscrew. I think it is a 4mm pitch but I cannot confirm this from the manual. I can only assume this from other charts I have found on the net for this model of lathe.

  4. #4
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
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    Default

    How did you work out you needed a 42 tooth gear.

  5. #5
    Join Date
    Feb 2022
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    Barongarook
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    Default

    The main man at machinery warehouse got me an old thread chart for my lathe. They stopped putting the old chart on the lathe in 2016. The only problem is I can't find an Indicator chart to tell me when to engage the half nut so I can get correct timing on the thread.

  6. #6
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    Jun 2007
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    Default

    You will need to keep the halfnuts engaged, your chasing dial only suits metric threads, it won't do imperial.

  7. #7
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    Feb 2022
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    Thanks guys, I just can't afford to stuff this up. The barrel is an expensive target 223. I really appreciate the help and feed back.

  8. #8
    Join Date
    Jun 2007
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    sydney ( st marys )
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    Default

    Seeing that this seems to be the first Imperial thread you have cut, are you familiar with the process of cutting this thread with the half nuts left engaged.

  9. #9
    Join Date
    Dec 2007
    Location
    Adelaide
    Posts
    574

    Default

    If you can't afford to stuff it up then it might be a good idea to do a dummy run on a bit of scrap mild steel to check fits etc.

  10. #10
    Join Date
    Dec 2005
    Location
    South Australia
    Posts
    1,656

    Default

    Most gunsmiths I have had any thing to do with do not use the chasing dial they all seem to use the reverse cut method. I think this is because it it easier to adjust the shoulder so the break aligns correctly.

  11. #11
    Join Date
    Feb 2022
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    Barongarook
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    57
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    Default

    Thanks Guys, I will be using the reverse cut method. I have used it before on some hydraulic valves I had to fix but they were common imperial threads.

  12. #12
    Join Date
    Oct 2007
    Location
    Alexandra Vic
    Age
    69
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    654

    Default

    Quote Originally Posted by [email protected] View Post
    Thanks Guys, I will be using the reverse cut method. I have used it before on some hydraulic valves I had to fix but they were common imperial threads.
    If you are familiar with the technique of threading with the half nuts closed all the time, provided you get the gear train correct for the particular pitch you are cutting, the method should work equally well whether you are using it for metric, common imperial, or oddball imperial.

    Would definitely cut a test thread on some scrap before starting on the part in question, to test the information you were given regarding the gear train, and to test your fits with the mating part as well.
    I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.

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