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Thread: Tangential (diamond) Tool Holder

  1. #1
    Supporting Member Crusty's Avatar
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    Tangential (diamond) Tool Holder

    After seeing Celsoari's effort I decided to learn about Tangential Tool Holders and to make one. Here's my finished holder.

    Tangential (diamond) Tool Holder-cam-test.jpg
    Side view in QC mount



    Tangential (diamond) Tool Holder-finished-end.jpg
    End view

    Tangential (diamond) Tool Holder-finished-top.jpg
    Top view (see the diamond)

    It uses a common ¼" lathe cutting tool, flat ground on the end at a 30º angle from the point. The holder itself rakes the point forward 12º and inward 12º and the holder was made so that the cutting tool is rotated 45º from parallel to the ways. After using it some, I'll probably make right and left hand holders too with the cutting tool parallel for more options when turning or facing. Since the tool is very rigid it cuts beautifully in aluminum and steel (I'd never seen 3' long thread like chips before), and resharpening to a pristine new edge takes less than 5 minutes with a bench grinder jig I also made. The Caswell black oxide finish turned out nice and the process is a lot easier than anodizing aluminum for procedural comparison.


    Tangential (diamond) Tool Holder-first-cuts.jpg Tangential (diamond) Tool Holder-steel-cut.jpg
    Aluminum ________________ Steel

    Holding it at all the correct angles for milling was a challenge but this configuration worked well without having to buy anything to get 'er done.

    Tangential (diamond) Tool Holder-complex-milling.jpg


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    Last edited by Crusty; Jan 6, 2021 at 05:00 PM.
    If you can't make it precise make it adjustable.

  2. The Following 5 Users Say Thank You to Crusty For This Useful Post:

    baja (Jan 7, 2021), Christophe Mineau (Oct 7, 2021), Jon (Jan 6, 2021), mwmkravchenko (Jan 6, 2021), Stevohdee (Jan 6, 2021)

  3. #2
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    Thanks Crusty! We've added your Tangential Tool Holder to our Tool Holders category,
    as well as to your builder page: Crusty's Homemade Tools. Your receipt:




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  4. #3
    Supporting Member Crusty's Avatar
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    Here's some more pictures that hopefully show more. This thing is surprisingly difficult to take pictures of which show any detail.

    Tangential (diamond) Tool Holder-new-cam-test-3.jpg____ Tangential (diamond) Tool Holder-new-cam-test-2.jpg____ Tangential (diamond) Tool Holder-new-cam-test.jpg
    If you can't make it precise make it adjustable.

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    olderdan (Jan 7, 2021)

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    Supporting Member metric_taper's Avatar
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    Quote Originally Posted by Crusty View Post

    Click image for larger version. 

Name:	Complex milling.jpg 
Views:	294 
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ID:	37748

    Interesting setup on the mill. Looks like a fun compound angle setup.
    What is that mill, horizontal and vertical.
    Also, seems you either have no walls on your machine shop or large doors that are opened to see the outdoors.

  7. #5
    Supporting Member Crusty's Avatar
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    It's commonly known as Shade Tree Machine Works hereabouts. I keep my tools wrapped with oil soaked cloth and covered with tarps, and wrap up time at the end of the day is significant but ya make do with what ya got. I generally smell like a truck stop (and feet) from the petroleum products in liberal use.

    It's a Grizzly G0727 Combo Mill. It does a beautiful job planing in horizontal mode and with adjustment not too bad in vertical. I upgraded it to a ¾HP 3 phase motor and a VFD and it does a fine job at all speeds now. My Dodge Ram power feed on it is still working adequately too.

    Tangential (diamond) Tool Holder-all-faces-planed.jpg

    The biggest challenge with the fixturing was making it all fit in the limited headroom.



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    If you can't make it precise make it adjustable.

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