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  • "Tiny" Independent 4 Jaw

    From Bob La Londe@21:1/5 to All on Sun Mar 12 11:02:41 2023
    I think I am looking around for a "small" independent 4 jaw.

    Some time back I saw Steffen Gottswinter (spelling) make a video where
    he used offset drilled bushings to grind off center tool shanks. This
    is handy for making things like boring bars threading tools, and inside grooving tools. You can even make a single form single flute thread
    mill this way in a pinch. Basically an inside threading tool.

    I certainly could do this and its pretty easy. I just need to decide
    what sizes I want to make first, and how far they should be offset. For
    any particular tool I think they would strongest if the offset is only
    enough to make that particular tool. I have made tool and drill
    bushings before. Solid and split both. I have run my solid bushings at
    upto 34,000 rpm (some of them, and I've got a split bushing for a drill
    that I use at 5,000 all the time. I'm confident in my ability to make
    them. The thing is for this purpose I might have to make dozens of them eventually.

    This morning I was watching Steve Summers video on setting up a 4 jaw to
    use on his tool and cutter grinder to grind offset clearance diameters
    like Steffen's bushings, but you just dial it in on the 4 jaw. When
    your offset is ground switch it to a collet to grind in the tool's
    cutting surfaces/edges.

    Steve used a much larger chuck than I would have chosen. I don't think
    I could fit that on my little single lip tool and cutter grinder (d-bit grinder). I think a little 2 inch or maybe 3 inch that would open to
    hold upto a piece of half inch carbide or HSS would be perfect for me.
    They make scroll chucks that small. I have a couple (I use them like
    centers on rotating arbors), but they are scroll chucks. I have not
    seen an independent jaw that small.

    Quality doesn't even have to be all that great. It's just for grinding
    a clearance offset to allow for maximum remaining material for strength.
    The important griding all comes after its swapped back to a collet.
    --
    Bob La Londe
    Proffessional Hack, Hobbyist, Wannabe, Shade Tree, Button Pushing, Not a
    real machinist

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  • From Bob La Londe@21:1/5 to All on Sun Mar 12 11:05:16 2023
    Sorry guys. Wrong group.

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  • From Rick Begeman@21:1/5 to Bob La Londe on Sun Mar 12 20:06:29 2023
    On 3/12/23 11:02 AM, Bob La Londe wrote:
    I think I am looking around for a "small" independent 4 jaw.


    Plenty of them sold on amazon for Mini lathes.

    --
    Ironhead Rick

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  • From Snag@21:1/5 to Rick Begeman on Sun Mar 12 22:36:42 2023
    On 3/12/2023 10:06 PM, Rick Begeman wrote:
    On 3/12/23 11:02 AM, Bob La Londe wrote:
    I think I am looking around for a "small" independent 4 jaw.


    Plenty of them sold on amazon for Mini lathes.


    Lots of 'em on ebay too , most under a c-note .
    --
    Snag
    “Free speech is my right to say what you don’t
    want to hear.” -George Orwell

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