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Type: Posts; User: Joe Gwinn

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    I assume that the modern blade is to too wide for...

    I assume that the modern blade is to too wide for the old holder to fit.




    I looked Bergstrom up, and found the following US patent: US2616326A, issued in 1952. Also US2148852A (1939) and...
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    Is this Chinese partoff tool a steel blade...

    Is this Chinese partoff tool a steel blade holding a somewhat wider carbide nugget that does the cutting? These work well because they are less critical about getting the steel blade exactly...
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    What does Extra Strength mean exactly? Increased...

    What does Extra Strength mean exactly? Increased spring stiffness by shortening the effective lengths of the spring arms?

    How does it work? Are there conical seats?
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    I suspect that the purpose of the black button...

    I suspect that the purpose of the black button (whose clamping force could be adjusted, it appears) was to damp vibration to reduce remaining chatter (versus digging in).

    Some also had a feature...
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    Because I don't have a long enough compound...

    Because I don't have a long enough compound and/or travel for that to work.

    I use a Dorian cutoff blade holder that can be installed upside down, and accepts an ISCAR blade with carbide tooth. ...
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    As others have said, a very old and common...

    As others have said, a very old and common approach, one that is especially useful on the floppy lathes of yore. They were often called "gooseneck" tool holders - also commonly used for threading.
    ...
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