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  1. #1
    Join Date
    Aug 2019
    Location
    Revesby - Sydney Australia
    Age
    56
    Posts
    1,183

    Default How NOT to adapt a lathe carriage-stop

    I bought a cheap stop from China:

    https://www.aliexpress.com/item/32982044383.html

    IMG_1054.jpg


    Probably for a Sieg lathe. Was hoping it would clamp on my Hercus V, but it's too small:
    IMG_1055.jpg


    So I thought I would try to mill it out. First, mount and clock: IMG_1056.jpg


    Then, try to mill out the clearance slot.
    Will a single clamp hold it? No, no it didn't: IMG_1057.jpg


    OK. I'll try a dodgy old machine vice. I don't have any parallels, so I'l try to fudge it:
    IMG_1058.jpg



    (then it got too hot, so I stopped for the day. Will continue the story on Monday)

  2. #2
    Join Date
    Aug 2012
    Location
    Greenmount, W.A.
    Age
    70
    Posts
    272

    Default

    I made a Hercus stop from a short piece of 25x25 square bar, and a M6x1 threaded rod for adjusting the stop. Didn't take long to make.

    Parallels. Old bearings, and bearing rollers, and HSS make cheap parallels. They can be made too. There was an article in Model Engineering Workshop about that. I would need to search for the issue.

  3. #3
    Join Date
    Aug 2019
    Location
    Revesby - Sydney Australia
    Age
    56
    Posts
    1,183

    Default

    Milled out the slot a bit more:
    IMG_1064.jpg


    Then upgraded to a borrowed, tilting, vice:
    IMG_1065.jpg

    for opening up the V:
    IMG_1066.jpg IMG_1067.jpg


    which seemed to do OK. Not a perfect surface finish, but for a blunt old 10mm cutter, good enough:
    IMG_1068.jpg


    Now, onto the other block...
    IMG_1072.jpg IMG_1073.jpg



    OK. Assemble and test:
    IMG_1074.jpg IMG_1075.jpg


    A quick crank of the carriage showed that it didn't grip very well.

    1) Tried tightening the M6 lever clamp as much as I dared. A gentle push from the saddle will feel you are at the stop, but I can't imagine when actually cutting something – pushing a cutter into hot metal – that it would restrict very much.

    2) Tightened it a lot more. It almost does the job, but looking closely shows that the back of the top half is lifting away from the V.

    3) Hacky solution, using what I had on hand:

    IMG_1076.jpg



    Summary: A clamp designed for a 15mm? V isn't strong enough for the Hercus's 20-ish-mm wide V

  4. #4
    Join Date
    Aug 2004
    Location
    Perth Western Australia
    Age
    65
    Posts
    203

    Default

    There a some good examples of lathe stops made by forums members on this site including mine.

    https://metalworkforums.com/f303/t20...ndicator-mount

    I have since slotted the stop bar and added matching pin to the body to stop the dial indicator rotating during adjustment.

    Mark
    I've become a tool of my tools.

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