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Thread: Ball And Radius Turning Attachment

  1. #1
    Supporting Member rossbotics's Avatar
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    Dec 2013
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    rossbotics's Tools

    Ball And Radius Turning Attachment

    I have seen different versions of radius turning tools all over the net, I have pretty much all tools to do just about anything possible, The one thing I didn't have was one of these, I probably want use it very much but never the less I made one to fit my Clausing 14" X 48 Lathe.
    I have made allot of knobs and things of that nature from time to time whenever there was a call for it, and I would always make a knurled straight knob, So I wanted to be able to make a lot of variations of handles and ball knobs.
    Ball And Radius Turning Attachment-100_0578.jpg
    The main body was made from O-1 Tool Steel, The tool bit holder was made from 5/8" 303 stainless steel and so was the turning handle and radius adjusting screw.
    Ball And Radius Turning Attachment-100_0579.jpg
    There is an aluminum knurled knob on top of the radius adjustment screw, and the pivoting handle has an aluminum ball on the end of it which I made with this tool.
    Ball And Radius Turning Attachment-100_0580.jpg
    The main body has 45 degree male and female dovetail slides with 6-32 screws on the side for take up which works effortless, the radius adjusting screw is 3/8"-24 for a fine adjustment,
    Ball And Radius Turning Attachment-100_0581.jpg
    The lever collar was made from 2" bar stock, 4140 Heat treated, I used my BXA boring bar holder from my quick change tool post for the pivoting shaft to turn in, which was made from 3/4" 4140 Heat treated bar stock.

    I didn't do any drawings or anything just rough sketches on paper here in the shop, but with a little imagination and maybe some trial and error you can make one just as good or better.

    Happy Machining


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  2. The Following 3 Users Say Thank You to rossbotics For This Useful Post:

    Catfish (Aug 12, 2014), kbalch (Aug 11, 2014), Paul Jones (Aug 13, 2014)

  3. #2
    kbalch's Avatar
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    Jun 2012
    Clermont, FL
    Thanked 531 Times in 383 Posts
    Thanks rossbotics! I've added your Ball Turning and Radius Attachment to our Machining category, as well as to your builder page: rossbotics' Homemade Tools. Your receipt:

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  4. #3
    Supporting Member Catfish's Avatar
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    Oct 2013
    Mariposa, California
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    Catfish's Tools
    I love your idea. Thanks for showing us.

  5. #4
    Supporting Member
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    May 2013
    Thanked 7 Times in 7 Posts
    Doug, very clever! Modifying/adapting a quick change tool holder will make radius turning job a lot easier. Thanks for sharing this with us!

  6. #5

    Join Date
    Aug 2014
    Thanked 5 Times in 3 Posts
    Hi rossbotics. Could you show some pic of the point of the tool bit you use in this ball turning attachment? or a drawing with its geometry?
    Thank you in advance.

  7. #6
    Supporting Member Captainleeward's Avatar
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    Jul 2014
    San DIEGO, California
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    Captainleeward's Tools
    Really nice lathe attachment! Doug.

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