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  1. #16
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
    Posts
    1,435

    Default

    No worries - it can be a confusing topic.

  2. #17
    Join Date
    Jul 2019
    Location
    Caboolture
    Age
    43
    Posts
    18

    Default

    i am going through this same issue i think.
    Have a QCTP AXA 250-111

    My mars lathe has a bolt to hold old tool post down.

    This bolt is to large for the QCTP.

    I only had 5 minutes to look at it yesterday so not sure on sizes or anything.

    But would i be better off changing bolt or boring QCTP ?

    Thanks

    Daniel

  3. #18
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
    Posts
    1,435

    Default

    Change the bolt/stud.

  4. #19
    Join Date
    Sep 2016
    Location
    Adelaide
    Posts
    22

    Default question about the indexing plunger

    Quote Originally Posted by nadroj View Post
    My 260 uses this 250-100 toolpost.
    A new mounting stud and sleeve were made to fit it.
    The spring loaded indexing plunger was removed by tapping out from underneath, after removing the gib strip for access.
    There's a brass cap filling the space.
    hi, so I bought now an AXA 100 QCTP from M&G in Melbourne - so yes, I have to make a new stud with Imperial thread, which I cannot do myself on my Metric Hercus, so its either buying a gearset to do so, or find a lathe where I can machine one for me. Either choice is not gonna be easy, but anyhow, i gotta solve that.
    More importantly, the indexing plunger cannot be used on my QCTP, it hasnt got any holes for it, neother is there any space to drill them in, but would be just pushed down by the QCTP, why did you take it out and how do you get the QCTP now square to the chuck? You align the tool somehow?

    Thank you very much

  5. #20
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
    Posts
    1,435

    Default

    If I need to get the toolpost square to the chuck, like when I am parting off, I leave it loose and move the carriage to the left so that a face of the TP block is up against a flat surface of the chuck. Then tighten it.

  6. #21
    Join Date
    Sep 2016
    Location
    Adelaide
    Posts
    22

    Default QCTP for Hercus 260

    Quote Originally Posted by nadroj View Post
    If I need to get the toolpost square to the chuck, like when I am parting off, I leave it loose and move the carriage to the left so that a face of the TP block is up against a flat surface of the chuck. Then tighten it.
    Okay - thanks a lot for the tip. Sounds reasonable. I probably have to develop a process for this when I actually get to using all this.

    But could you also please enlighten me why you took that index plunger out? It might pop up when you turn the QCTP, but then you could press it lightly down and turn the QCTP all the way? I see I guess when I get there.

    And also - All I need is the correct imperial thread die and turn the stud to the correct diameter - and done. no threading required

    cheers
    Werner

  7. #22
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
    Posts
    1,435

    Default

    I didn't need to remove the index spring plunger. It will work OK with it still in place - just as a system I find it a bit annoying.

    To cut your threads, using a die might work, as long as you guide it with a tailstock mounted holder to ensure accuracy.
    Or maybe someone here could make a stud or stud+sleeve for you.
    For example, Pipeclay does bits for Hercus lathes.

  8. #23
    Join Date
    Sep 2016
    Location
    Adelaide
    Posts
    22

    Default QCTP for Hercus 260

    Quote Originally Posted by nadroj View Post
    I didn't need to remove the index spring plunger. It will work OK with it still in place - just as a system I find it a bit annoying.

    To cut your threads, using a die might work, as long as you guide it with a tailstock mounted holder to ensure accuracy.
    Or maybe someone here could make a stud or stud+sleeve for you.
    For example, Pipeclay does bits for Hercus lathes.
    I try to get it done - but thanks for the offer and idea - I'll keep that in mind

    I m bit confused tho - did you not state in reply #4, and I quote: " ... The Spring loaded indexing plunger was removed by tapping out from underneath...."
    That made me think you have no indexing plunger anymore, sorry. I misunderstood.

  9. #24
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
    Posts
    1,435

    Default

    Sorry, I should have said, "I didn't need to remove the plunger, but I did anyway because it was annoying."

  10. #25
    Join Date
    Sep 2016
    Location
    Adelaide
    Posts
    22

    Default QCTP for Hercus 260

    Quote Originally Posted by nadroj View Post
    Sorry, I should have said, "I didn't need to remove the plunger, but I did anyway because it was annoying."
    Okay, thank you - all good.

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