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  1. #1
    Join Date
    Aug 2019
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    Revesby - Sydney Australia
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    55
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    819

    Default Strange ways to hold things before machining them?

    1) A restaurant needs some meat clamps. I bought some stainless u-bolts, and wing nuts, but to make it easier to push through the meat, the ends need to be pointier than this:
    IMG_3584.jpg

    Now, a sensible person would just grind a point on them and move on.
    I'm not sensible. I want to use a lathe.
    Have a chat with the toolmaker. We throw ideas around...
    V block on a rotary table? Rod chamfering cutter? Tiny chuck in larger chuck on the lathe?

    Then I spy a little collet chuck:
    IMG_3585.jpg
    which I can just mount in Adam's old Taylor chuck:
    IMG_3586.jpg
    (oops, that cutter will foul on the other side of the u-bolt)
    IMG_3587.jpg
    (and that one won't work on my Hercus because the spindle only goes forward)
    IMG_3588.jpg
    Yep, that worked:
    IMG_3589.jpg


    2. Reducing the size of a spade terminal. A 5x20 fuse holder melted. I bought a 3AG holder to replace it, but it has 6.3mm wide spades. Wiring has 4.8mm wide terminals. Spades are copper. I don't want to grind it.

    A sensible person would cut it narrower with some sharp cutters. I try to mill it. The spade rotates around, in the holder. Time for a tricky spacer behind the terminal:
    IMG_3597.jpg
    (hard to see, but that is a C shaped car engine bearing between the back of the space and the jaw)
    IMG_3598.jpg
    The second cut was a bit trickier to position a spacer.

    End result was acceptable. Not perfectly straight, but the smaller terminal locked on well enough:
    IMG_3599.jpgIMG_3600.jpgIMG_3601.jpg

  2. #2
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    5,579

    Default

    Quote Originally Posted by nigelpearson View Post
    1)
    2. Reducing the size of a spade terminal. A 5x20 fuse holder melted. I bought a 3AG holder to replace it, but it has 6.3mm wide spades. Wiring has 4.8mm wide terminals. Spades are copper. I don't want to grind it.

    A sensible person would cut it narrower with some sharp cutters. I try to mill it. The spade rotates around, in the holder. Time for a tricky spacer behind the terminal:

    IMG_3597.jpg
    (hard to see, but that is a C shaped car engine bearing between the back of the space and the jaw)
    IMG_3598.jpg
    The second cut was a bit trickier to position a spacer.

    End result was acceptable. Not perfectly straight, but the smaller terminal locked on well enough:
    IMG_3599.jpgIMG_3600.jpgIMG_3601.jpg
    Hi Nigel,

    What's wrong with using a file ?
    Best Regards:
    Baron J.

  3. #3
    Join Date
    Mar 2011
    Location
    Southern Flinders Ranges
    Posts
    1,235

    Default

    Glad the chuck is getting used, although Iím currently rueing my decision to sell it.
    The forward placed jaws and scalloped body on the Taylor certainly help make that setup possible

  4. #4
    Join Date
    Jun 2011
    Location
    Melbourne, Australia
    Posts
    37

    Default Strange ways to hold things before machining them?

    Glad all went well, but to my way of thinking, that U-bolt looked like it was just waiting to take off a finger

  5. #5
    Join Date
    Aug 2019
    Location
    Revesby - Sydney Australia
    Age
    55
    Posts
    819

    Default

    Quote Originally Posted by BaronJ View Post
    What's wrong with using a file ?
    Nothing

    That is usually the first tool I grab to use, but this copper was fairly thin, and then there is the difficulty of grabbing it:
    IMG_3608.jpg

    A smaller vice might have been able to grab it. Like maybe a pin vice:
    IMG_3609.jpg

    Anyway, a sharp milling cutter did each cut in 20 seconds. A file might have taken a minute or two

  6. #6
    Join Date
    Aug 2019
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    Revesby - Sydney Australia
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    55
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    819

    Default

    Quote Originally Posted by Salv View Post
    Glad all went well, but to my way of thinking, that U-bolt looked like it was just waiting to take off a finger
    Maybe. The u-bolt was 65mm wide (inside), so 77mm total, or 154mm swing.
    Hercus 9 can do 235mm around bed+saddle. Can nearly fit a fist in between there!


    The outer u-bolt end just fitted in a sweet spot under the left compound lock screw.
    I could have gone a few mm closer?

    Probably about as unsafe as any oddly shaped thing bolted to a lathe faceplate.

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