Aluminum shaft with captive ring

Captive ring

Lathe experiment #2, machined out of a piece of solid aluminum rod. Basically, the ring is stuck because it was carved out of the rod. A collaboration with Matt Stultz.

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7 Responses to Aluminum shaft with captive ring

  1. Marty says:

    So friggin’ awesome! Can you show me how you did this, sometime?

  2. mahto says:

    Sure, it’s just a trick- you start by machining down two sections of rod, leaving a ring-sized separation between them, and then you turn the tool on an angle and undercut it until it is free :-). You can make one, if you want!

  3. Firo says:

    I’m goin to have to try this.

  4. mahto says:

    You should! Remember to send photos, too!

  5. Semilla says:

    Do you have a video??? impressive

  6. mahto says:

    Thanks! We didn’t make a video for this one, however I will certainly make one next time.

  7. Jeff Avery says:


    Very cool idea. As requested here’s a picture of mine. I did this on a HF 9×20 I recently picked up from Craig’s List. I picked up some aluminum rod from Ebay pretty cheap. Thanks for the idea.


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