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Ruined threads on spindle

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  • #16

    Get an ER torque wrench. It's the only way to do it right.

    Chasing threads with a thread file is fine. A motor repair shop would do exactly that.

    Unless it's an ATC spindle or 5hp+ Colombo, the spindle is considered disposable. For example, I borked the threads on my spindle 15 years ago and they wanted $800 for a replacement main shaft - no bearings. Bearings were another $700 and none of this included an ounce of labor. I thread filed it and that spindle is still useable today... although it's getting time for new bearings.
    IBILD Solutions - High Definition 3D Laser Scanning Services - Advanced CNC Training and Consultation - Vectric Custom Video Training


    • #17

      I love this phrase: one quarter turn past "snug" is BROKEN!
      Busch Vacuum table, two zone
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      • #18

        Repair of damaged threads on the Spindle of the Stinger II.pdf We are a guild so have many trainees learning CNC programming and machining on our machines. In January and February 2023, we replaced our old machine with a Stinger I and Stinger II. Soon afterwards, a trainee cross threaded the spindle of the Stinger II, requiring a cheater bar to remove the collet nut. The attached pdf describes the process we used to repair the threads.

        David Dewease CNC Coordinator at Greenville Woodworkers Guild, Greenville SC
        Attached Files
        Last edited by GWG_CNC; 03-19-2023, 11:11 AM.
        SR-24 and SR-44 (2022 and 2023)


        • #19

          My suggestion is a Musclechuck which eliminates which after installation eliminates the removal of the collet nut. Just one allen screw to tighten and much easier to change bits. I have one on my Stinger and router table and I love it. I am old with arthritis in my hands and I can still use it. I have never had a bit come loose. Joey will give you a 10% discount if you have a Camaster CNC. FWIW

          Keith Hyde, Winchester, VA
          2016 Stinger 1, 1.7KW HF Spindle HSD
          Performance Package Pro, Vac, lathe, Aspire 10
          Former Marine and retired Seabee Master Chief.
          Furniture is my hobby not my vocation.