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  1. #1
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    Default Ball Turning Tool

    Anyone make their own? It doesn't seem overly difficult but have you made one and have some knowledge or advice to share? I haven't decided on a design but it seems like I can make somethign to clamp onto my QCTP or straight to the compound.

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    Is there such a thing as modular dovetail components? Maybe I just don't know what to call it but say I wanted to have a dovetail assembly be part of the design to adjust the radiius, where might I find some pre-made dovetails that I can locate on a base by drilling or tapping them?

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    Over the top ball turner?








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    yep, I made one of those too
    img_7637.jpg
    img_69962.jpg

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    Where did those dove tail assy's come from?

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    They are offset boring heads.

    Sent from my moto g stylus using Tapatalk

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    I made one similar to Jim’s. They’re great. Turns a nice small ball ( like a marble) or large ( like a doorknob). Not hard.

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    So how are you mounting the boring head to the block ? I'm guessing that teh boring head has a taper of some sort ? MT , R8 , or something like that ?
    thanks
    animal

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    Quote Originally Posted by Dumpster_diving View Post
    I made one similar to Jim’s. They’re great. Turns a nice small ball ( like a marble) or large ( like a doorknob). Not hard.
    But you aren't on center. WTF?

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    they are on center.
    its just from a diff approach.
    "on center" is a bit of a misnomer.
    really its "at the peak" or "top dead center" from whatever approach the tool is coming from.

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    Problem with most designs is you have to keep away from the chuck a fair bit
    Thats why I like the Witte RKD1 design
    witte RKD1 - Google Search

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    I might be in luck here since I have an Aloris 41D with a 1.25 dia bore!

    image004.jpg

    image005.jpg

    image002.jpg

    So is there anything to look for in my quest for an offset boring head?

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    It's just an inexpensive boring head from MSC corp. Nothing fancy. Mine has a threaded
    spigot, and I just turned up a straight spindle to go in there. The spindle runs in a fairly snug
    oilite bearing in that block.

    More photos, repairing a busted handle:

    [IMG]http://www.mwdropbox.com/dropbox/pw_handle_fix_0.jpg[IMG]








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    Quote Originally Posted by Peter from Holland View Post
    Problem with most designs is you have to keep away from the chuck a fair bit
    Thats why I like the Witte RKD1 design
    witte RKD1 - Google Search

    Peter,

    I followed your link and made my own search. This is a mechanism I never saw before. My guess is that the crank drives a worm and that drives the rotation of the cutting tool, but it is not clear to me exactly what part is actually rotating. It can't be the base with the two semicircle shapes, or is it?

    If you would be so kind as to describe how it works , I would really appreciate it. If you have one and could take a sequence of pictures of it in action, it would be great. It doesn't need to cut anything, just seeing the movement is enough.

    By the way, for everyone, if you want to see examples of even more elaborate ball cutters, search for the Hardinge one or the one by Monarch!

    Thanks,

    Jacques

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    Quote Originally Posted by jariou View Post
    Peter,

    I followed your link and made my own search. This is a mechanism I never saw before. My guess is that the crank drives a worm and that drives the rotation of the cutting tool, but it is not clear to me exactly what part is actually rotating. It can't be the base with the two semicircle shapes, or is it?

    If you would be so kind as to describe how it works , I would really appreciate it. If you have one and could take a sequence of pictures of it in action, it would be great. It doesn't need to cut anything, just seeing the movement is enough.

    By the way, for everyone, if you want to see examples of even more elaborate ball cutters, search for the Hardinge one or the one by Monarch!

    Thanks,

    Jacques
    The mecanisme is 2 gears behind eachother with a idler gear in between Then a connection rod A bit like on a locomotief On the connection rod the cutting tool is mounted The radius is set by moving the connectionrod to or from the centre of the 2 gears One gear is actuated with a worm wormwheel The other gears follow as they are in mesh With a round insert you can cut a radius till the ball is cut off 300 dgr or more
    Peter

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    This is a lot more involved than I expected. This is the style I use at my job. No live tooling. Just a pivot, a slide to adjust the radius and a piece of HHS.


    20210203_141400.jpg
    Attached Thumbnails Attached Thumbnails 42780a.jpg  

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    Quote Originally Posted by Peter from Holland View Post
    The mecanisme is 2 gears behind eachother with a idler gear in between Then a connection rod A bit like on a locomotief On the connection rod the cutting tool is mounted The radius is set by moving the connectionrod to or from the centre of the 2 gears One gear is actuated with a worm wormwheel The other gears follow as they are in mesh With a round insert you can cut a radius till the ball is cut off 300 dgr or more
    Peter

    Thanks Peter, this is helpful. This seems to be a unique method of generating a circle, at least for the purpose of turning balls on a lathe.

    If I understand correctly, the effective pivot point of the circle movement of the tool is not actually over the tool, it is to the left of the tool entirely. Is that correct?

    To generate a ball, the cutting tool has to pivot over a point that is directly under the center of the ball being cut. It seems that this attachment accomplishes that with no part of it ever being directly under the center of the ball.

    I would really like to see one of those in action!

    Thanks again.

    Jacques

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    Quote Originally Posted by jariou View Post
    Thanks Peter, this is helpful. This seems to be a unique method of generating a circle, at least for the purpose of turning balls on a lathe.

    If I understand correctly, the effective pivot point of the circle movement of the tool is not actually over the tool, it is to the left of the tool entirely. Is that correct?

    To generate a ball, the cutting tool has to pivot over a point that is directly under the center of the ball being cut. It seems that this attachment accomplishes that with no part of it ever being directly under the center of the ball.

    I would really like to see one of those in action!

    Thanks again.

    Jacques

    Sorry But I gave wrong information

    In fact it is 2 wormwheels on a single worm behind eachother
    Rotating the worm makes the wormwheels rotate simultanisly in the same direction

    Peter

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    Did anyone make a tool to cut with RCMT inserts? Is there anything that needs to be shared that might help me in that pursuit?

  25. #20
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    first thot is R inserts would limiting and chatter prone in that application

    i think a V insert would be a better choice


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