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  1. #1
    Join Date
    May 2016
    Location
    AU
    Posts
    30

    Default Cutting a 2mm pitch 3/8 acme thread

    So I'm up to cutting the thread on the replacement compound feed screw.

    Putting the gearbox in 2mm pitch mode works for a normal triangular thread, but looks way too small for the acme thread.

    Should I be using a different pitch or feed rate for acme thread? The gearbox mentions 50 or 20 stud gear. Which one is that?

    I haven't done a lot of threading to date. I'm also going to put a forward and reverse switch on the lathe as I don't have a threading dial.

    Any pro tips?

    Martin

    Sent from my H4133 using Tapatalk

  2. #2
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
    Age
    64
    Posts
    4,887

    Default

    Take the 20 off the stud and take the 50 off the screw, put the 50 on the stud and the 20 on the screw, engage the 50 with the 80 and the 45, use the 20 as the spacer on the screw.

  3. #3
    Join Date
    May 2016
    Location
    AU
    Posts
    30

    Default

    Awesome, easy to understand instructions that directly answer my question.
    Thanks Pipeclay.

    Sent from my H4133 using Tapatalk

  4. #4
    Join Date
    Nov 2015
    Location
    Brisbane Australia
    Posts
    85

    Default

    This You Tube clip might be helpful

    https://www.youtube.com/watch?v=df-7...ature=youtu.be

  5. #5
    Join Date
    May 2016
    Location
    AU
    Posts
    30

    Default

    So thanks to the help of pipeclay I set up the change gears, ground a hss tool, and had a go at cutting the acme thread.

    I was happy with this for my first go. I'll cut another one for practice before I have at my blank.

    Before I do, though, I really need to get a fwd/reverse switch. Rolling the chuck backwards after each pass got old pretty quickly. Anyone in Melbourne got a source for this kind of switch gear? I'm running a 1hp single phase motor through a DOL switch. Any issues I should consider?

    Martin

    Sent from my H4133 using Tapatalk

  6. #6
    Join Date
    Oct 2010
    Location
    melbourne, laverton
    Posts
    1,910

    Default star wheel

    if your in melbourne you can borrow my star wheel if you like.
    aaron

  7. #7
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,443

    Default

    Hi Guys,

    If a star wheel is what I think it is, I made one using an old washing machine drum pulley.

    21022015-01.JPG 21022015-05.JPG
    You tighten the nut to expand the collet inside the lathe spindle.
    Another turning job.
    Best Regards:
    Baron J.

  8. #8
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
    Age
    64
    Posts
    4,887

    Default

    I maybe wrong but I think the Star wheel mentioned is referring to the Thread Chasing Dial.

  9. #9
    Join Date
    Oct 2010
    Location
    NSW
    Posts
    177

    Default

    No wheel at all on my version. I made the expanding collet and use my cordless drill to reverse back to the start of the thread.

  10. #10
    Join Date
    May 2016
    Location
    AU
    Posts
    30

    Default

    I thought it was a reference to the giant ferris wheel down at Docklands.

    I'll probably make something like that expanding arbor. I think I actually have something like that from an old washing machine myself! I like to use these bits and pieces so that I can prove that keeping it was worthwhile, despite what others in my household might say...

    Unless I find a fwd/reverse switch first. Or buy a thread dial from Mal.

    Martin

    Sent from my H4133 using Tapatalk

  11. #11
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,443

    Default

    Quote Originally Posted by pipeclay View Post
    I maybe wrong but I think the Star wheel mentioned is referring to the Thread Chasing Dial.
    Ah thanks

    Star wheel is a term I've not heard before. I've always referred to "Threading dial" or "Thread indicator".
    Best Regards:
    Baron J.

  12. #12
    Join Date
    Oct 2010
    Location
    melbourne, laverton
    Posts
    1,910

    Default threading dial

    as usual pipe clay was on the money.
    i was talking about a threading dial.
    aaron

  13. #13
    Join Date
    Aug 2012
    Location
    Greenmount, W.A.
    Age
    70
    Posts
    272

    Default

    It is Sunday, so brain not engaged yet, but.........

    Hercus Compound screw is a Left Handed thread. The photo showing the two threads are different hands or are they?

  14. #14
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
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    64
    Posts
    4,887

    Default

    Yes the Cross Slide screw and Compound screw are different, they are Left and Right handed.

  15. #15
    Join Date
    Aug 2004
    Location
    Perth Western Australia
    Age
    65
    Posts
    203

    Default Acme or Trapezoidal

    I am curious Acme threads are imperial only.
    The metric version is trapezoid.
    Not much different to look at but the metric screw has 15 degree flanks and a included angle of 30° not 29° like a Acme thread.
    Are they really Acme threads with a 2mm pitch?
    Mark
    I've become a tool of my tools.

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