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Carriage lock

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  • Carriage lock

    I was using my small lathe last night and locked the carriage several times during the job that I was working on .
    Then after completing most of the work I went to lock it again , but the screw kept on turning , no big deal I thought , just finish the face off by holding the carriage in place with right hand and turn the compound with left hand.
    Job now finished.

    Took the carriage apart , and after some frustration of having to work on a machine designed by some A^%$le who never had to dismantle a machine in their life.

    The "carriage lock "was simply an extension of a piece of cast iron bolted to the underside of the carriage , what a joke , Now I have to make a STEEL part which wont snap when used ,

    I am not someone who will blindly follow the manufacturers or anyone elses use of fragile material in an area which gets used daily .

    Cast iron is ok in large castings with bulk but for thin items which are or could be subject to stress I will always use a more suitable material.

  • #2
    You are lucky you have one.
    Many of the new machines don't even have them and if they do they don't work from new

    I came across one that was just a tapped hole into the apron, nothing to pull up against the bed at all.
    Someone in the factory had just removed a cap screw and replaced it with a square locking bolt.

    Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.


    • #3
      I have finally made some progress and have the compound off .
      The broken plate appears to not have been cut off from the rest of the guide as there is a section milled out to about 1mm depth for this lock plate to clamp onto .
      I have taken some photos which I will post later as I cant locate my cameras usb cord, at the moment, it was taken home during Christmas.
      I should be able to cut a piece of steel and machine it to the same dimensions of the original and get everything back together today.
      I will keep you posted.


      • #4
        I had a similar cast lock break on my Nardini. I was able to get both pieces out without removing anything else. The pieces fit back together perfectly for measurements to make a new one.
        Byron Boucher
        Burnet, TX


        • #5
          A quill lock is also something you don't see on drill presses any more.
          I have one on my Atlas drill press, and I use it all the time.
          Especially when aligning a part on the table or vise.