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  1. #1
    Join Date
    Oct 2004
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    Southern Highlands NSW
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    Default Spring type parting toolholder.

    Anyone tried a spring toolholder for parting?
    Hercus training lathes for schools were equipped with them.
    They don't feature anywhere much nowadays, maybe because they don't fit popular QCTPs easily.
    They offer a simple solution to parting problems, and other machining jobs.
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  2. #2
    Join Date
    Oct 2008
    Location
    Cairns, Q
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    666

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    Yes. I used to have problems parting on my old 9x18 Brackenbury and Austin lathe, a fairly lightly built machine, using a 1/8 HSS parting blade in a conventional holder. The problems were usually digging in unexpectedly due to flexing of the top slide and snapping the blade. When I changed to a 3/32 parting blade in a spring holder all the problems miraculously disappeared. Parting on the B & A is now no longer an adventure, but a predictable operation just like any other.

    The tool's box is branded Rimet. Some other Rimet tools I have were made in India and are of variable quality. No idea where this tool holder was made, but it seems OK. I bought it about 25 years ago, and the vendor is long gone, so I can't suggest where to look for these now.

    It really did make an enormous difference to parting off on the B & A lathe, and is usually first choice for parting on the Chinese 13x40 too.

    Frank

  3. #3
    Join Date
    Sep 2010
    Location
    Lebrina
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    1,910

    Default

    Back in the era when metal shapers were common, a variation of that spring holder was often used in them with good results from what I've read.

  4. #4
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
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    Default

    I can vouch that spring toolholders in shapers are useful, especially cutting narrow slots like keyways.
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  5. #5
    Join Date
    Aug 2008
    Location
    Charlestown NSW
    Age
    65
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    I've got one that I welded a block of steel to the side of the main body to lower the height. Works fine.

    part 001.jpgpart 002.jpg


    part 003.jpg

    peter
    Last edited by bollie7; 24th Nov 2020 at 03:07 PM. Reason: pics added

  6. #6
    Join Date
    Apr 2012
    Location
    Healesville
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    2,129

    Default

    I seen the name LOCK on your toolholders and it spurred a memory from the dim dark past so i pulled open a draw and dug these little chaps out.
    Thanks for reminder, these were used on my macson some years ago.
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  7. #7
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
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    Quote Originally Posted by bollie7 View Post
    I've got one that I welded a block of steel to the side of the main body to lower the height. Works fine.
    Rather than weld, I wonder if a separate adaptor would work.
    Then I could use the QC toolpost instead of changing to the old one just to part off.

  8. #8
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
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    Default

    Quote Originally Posted by shedhappens View Post
    I seen the name LOCK on your toolholders and it spurred a memory from the dim dark past so i pulled open a draw and dug these little chaps out.
    Big.

  9. #9
    Join Date
    Aug 2008
    Location
    Charlestown NSW
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    Quote Originally Posted by nadroj View Post
    Rather than weld, I wonder if a separate adaptor would work.
    Then I could use the QC toolpost instead of changing to the old one just to part off.
    Cant see why it wouldn't work.
    Just be aware of the increased overhang to the side of the toolpost. When used in my qctp there is a quite a lot of overhang, however so far is hasn't been a problem.
    peter

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