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  1. #16
    Join Date
    Aug 2008
    Location
    Melbourne
    Age
    34
    Posts
    1,075

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    Quote Originally Posted by Michael G View Post
    Short of knowing someone with a profile projector that can check the angle for you
    I can do that if you're in Melbourne.

  2. #17
    Join Date
    May 2016
    Location
    AU
    Posts
    30

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    I got a bit of quality shed time in last night and managed to knock up a copy of the feed screw for threading. Had to sharpen the cold chisel a couple of times. I'll probably try a test run on another shaft before I tackle this one.

    Anyone know the thread size on the handle end? I don't think it's metric according to my thread gauges.

    I am in Melbourne too, and thanks for the offer. I think I'll wing and see how I go.

    For some reason I'm getting signed in on this forum with the details from another tapatalk forum, so I've lost my history and location details....

    Martin

    Sent from my H4133 using Tapatalk

  3. #18
    Join Date
    Nov 2015
    Location
    Brisbane Australia
    Posts
    85

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    Quote Originally Posted by m.j.bower.69 View Post
    I got a bit of quality shed time in last night and managed to knock up a copy of the feed screw for threading. Had to sharpen the cold chisel a couple of times. I'll probably try a test run on another shaft before I tackle this one.

    Anyone know the thread size on the handle end? I don't think it's metric according to my thread gauges.

    I am in Melbourne too, and thanks for the offer. I think I'll wing and see how I go.

    For some reason I'm getting signed in on this forum with the details from another tapatalk forum, so I've lost my history and location details....

    Martin

    Sent from my H4133 using Tapatalk
    So was it trapezoidal or Acme?

    What steel did you use and how did you cut the threads, i.e. one tool to the shape/ profile or did you use a tool to hog out the majority then cut the two edges?

  4. #19
    Join Date
    May 2016
    Location
    AU
    Posts
    30

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    I haven't cut the threads yet, just turned a blank. Hopefully I'll get some time this weekend.

    I'll single point it, light cuts to sneak up on final size, using the feed nut to test. I have an acme hss tool so I'll check that in the 'old' screw and hone it to a decent fit.

    Martin

    Sent from my H4133 using Tapatalk

  5. #20
    Join Date
    May 2016
    Location
    AU
    Posts
    30

    Default

    Oh, and I'm using 1214 free machining steel.

    Martin

    Sent from my H4133 using Tapatalk

  6. #21
    Join Date
    Sep 2011
    Location
    Ballarat
    Age
    65
    Posts
    3,103

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    Hi Martin
    in your pic, is the thread on the right side of your machined blank the one you are copying?
    It looks (from the pic) to be a square thread.

    Phil

  7. #22
    Join Date
    Jan 2009
    Location
    Holbrook, NSW
    Age
    73
    Posts
    490

    Default

    Quote Originally Posted by m.j.bower.69 View Post
    Finally getting around to doing something about the slightly bent screw on my metric Hercus. Can anyone confirm whether the screw is trapezoidal or acme?
    The dials say 2mm per revolution.

    And a source for threaded rod, or am I going to have to make it?

    Cheers, Martin

    Sent from my H4133 using Tapatalk
    Hi Martin,
    It is definitely 2mm pitch acme thread on an imperial shaft. Turn the threaded section dia to an undersized 3/8 at .371". Pretty much every metric drive screw in a Hercus is acme thread form. You can take this as Gospel as it comes from original Hercus drawings.
    Mal

  8. #23
    Join Date
    May 2016
    Location
    AU
    Posts
    30

    Default

    Thanks Mal.

    I had a suspicion that there was something NQR about the threads on these metric Hercus 9s. I probably read it in one of your threads somewhere.

    Can you confirm what the thread is on the other end? Grateful for your assistance.

    Martin

    Sent from my H4133 using Tapatalk

  9. #24
    Join Date
    Jan 2009
    Location
    Holbrook, NSW
    Age
    73
    Posts
    490

    Default

    Quote Originally Posted by m.j.bower.69 View Post
    Thanks Mal.

    I had a suspicion that there was something NQR about the threads on these metric Hercus 9s. I probably read it in one of your threads somewhere.

    Can you confirm what the thread is on the other end? Grateful for your assistance.

    Martin

    Sent from my H4133 using Tapatalk

    7/32 whitworth

  10. #25
    Join Date
    May 2016
    Location
    AU
    Posts
    30

    Default

    Okay, I might make a new nut in metric. I don't have any whitworth dies.

    Martin

    Sent from my H4133 using Tapatalk

  11. #26
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

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    Hi M.J,

    Single point it on the lathe !
    Best Regards:
    Baron J.

  12. #27
    Join Date
    Nov 2010
    Location
    Frankston south
    Posts
    102

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    I'll lend you one if you're in Melbourne.

  13. #28
    Join Date
    Oct 2011
    Location
    Norwood-ish, Adelaide
    Age
    59
    Posts
    6,540

    Default

    Quote Originally Posted by m.j.bower.69 View Post
    ... I might make a new nut in metric. I don't have any whitworth dies.
    When repairing old machines, do your best not to mix fastener types - it really creates headaches later on, either because it degrades the machine (I once had a 1/2" UNC thread fitted where it should have been 1/2" BSW - pity about the tpi being different...) or will cause confusion for the next person that has to repair/ replace something.

    Taps and dies can usually be borrowed if you don't want to buy them (although that too is part of the rabbit hole experience)

    Michael

  14. #29
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Hi Guys,

    I've got to agree with Michael, the Taiwanese bandsaw that I've recently acquired, has a mix of metric, BSF and Whit screws and bolts.
    Best Regards:
    Baron J.

  15. #30
    Join Date
    May 2016
    Location
    AU
    Posts
    30

    Default

    I get where you're coming from. My view is that firstly the lathe is a tool, and I want it to work. If that means making changes so that it works for me and I can fix it, then I will.

    That said, the original screw and nut will be kept with the lathe and if I sell it, the new owner will be able to return it to original condition if they want.

    Plus I'm talking about a nut that has a slot head. It won't require a different tool from stock to remove.

    I did actually inherit some English dies from my uncle. I'll look through them to see what I've got. How do I identify a whitworth die?

    Martin

    Sent from my H4133 using Tapatalk

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