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Thread: Ideas for tangential cutter tool holder?

  1. #1
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    Default Ideas for tangential cutter tool holder?

    I'm looking at putting together a tangential tool holder to suit Norman Patent style QCTP systems, primarily this one:
    http://bbs.homeshopmachinist.net/thr...ange-Tool-Post

    Here's the design I've come up with:


    A few disadvantages I can see right from the start: The front face of the holder has a 12 degree angle with respect to the back face. The slot for the holder has a similar 12 degree angle, but should be much easier to accomplish, as it's just a 0.25 inch slot.

    Here's what I'm curious about: I'm looking at securing the tool in the slot with a large conical washer for a flat face M4 socket head cap screw. The slot will be ever so slightly less than the width of the tool. I don't think it will be enough, but I'm not sure.

    I'm wondering if anyone has a better idea for accomplishing this.
    Last edited by burdickjp; 11-23-2014 at 10:47 PM.

  2. #2
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    It looks like the washer will be in the way of the stock being turned. You could bandsaw a slot along the inside edge of the lathe bit slot and use a flathead screw coming in from the side opposite the slot in the drawing to clamp it in.

  3. #3
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    Quote Originally Posted by Toolguy View Post
    It looks like the washer will be in the way of the stock being turned. You could bandsaw a slot along the inside edge of the lathe bit slot and use a flathead screw coming in from the side opposite the slot in the drawing to clamp it in.
    I think if I mirror the whole thing to put the washer on the face closest to the head stock instead of its current face that may cure that. I can also run a thinner washer or recess it or something like that.

  4. #4
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    I've made a couple of these tangential toolholders now. My favorite design looks like this:




    This design allows for turning and facing without changing the set-up of the holder. The tool-bit is held very firmly--never had one slip!

    Here's a couple pics of the toolholder:







    Here's another one that uses a round bit for radii between facing and turning or taper and face, etc.




    Maybe you could adapt this to your tool post?

    Jim

  5. #5
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    I had been looking at the ones that grip that way and scratching my head as to how they get in there to cut it that way, and as I was looking at your pictures it dawned on me.
    It'd probably still be useful if you could discuss how you went about it.

    Thank you!

  6. #6
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    It can be done in essentially 3 setups:

    1) Drill the hole for the back corner of the toolbit, and the "flex" hole for clamping



    2) Machine the slot for the tool-bit. Use a slitting saw to remove the metal for one corner, a small end-mill to remove the metal from the other.




    3) Remove metal to shape the front and side of tool-holder, cut slit for clamping, drill and tap for clamp screws.




    Jim
    Last edited by Jim2; 11-24-2014 at 02:59 PM. Reason: added coordinate axes to drawings

  7. #7
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    That is fantastically helpful. Thank you VERY much.

  8. #8
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    I love the tangentials! Always happy to spread the good news.

    Jim

  9. #9
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    Here's where I'm at thus far with a clamping-style tool holder. I'm thinking one or the other sides needs a slot so that clamping the tool doesn't work against clamping to the post.


    I think it'd be easy to add another tool to the other corners of the holder. Either 1/8 inch or round or whatever.

    I'm trying to decide if it'd be advantageous to make the thickness of the holder such that I don't need to adjust height by moving the holder vertically on the post, since the tool can move vertically in the holder.
    Last edited by burdickjp; 11-27-2014 at 11:24 PM.

  10. #10
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    Here I've made the clamping mechanism different and added a round holder.

    I think when I go to make something I'll start with round since it will be much easier to manufacture.
    The rest of it honestly looks much more complicated than I want to attempt making. Way too many set ups and processes.

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