Using a roller turner on an engine lathe "video" - Page 2
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  1. #21
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    Quote Originally Posted by camscan View Post
    On screw machines this was standard practice.There was(is?)one type where the tool is spring loaded so that as the tool made contact with the material it would push back against the spring. At the end of the cut the tool would withdraw and the spring would push the tool bit forward. This eliminated any return mark. In the example Ray shows it looks as if the rollers are too far behind the tool bit which can lead to a dodgy start.For a different way to get a similar result you may want to look at a pointing tool holder. This has a guide bush in front of the tool bit.
    I think the reason for the dodgy start is because I was putting way too much chamfer on the end. Much better now.

  2. #22
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    Quote Originally Posted by camscan View Post
    .. I believe tangi flow were too big for screw machines,were they not used only on capstans? Not sure on that one.
    Nah, TangiFlow makes them down to 00 and 0 size. I have one of the small ones and it's not significantly bigger than a B&S roller box tool.

  3. #23
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    Quote Originally Posted by sfriedberg View Post
    Nah, TangiFlow makes them down to 00 and 0 size. I have one of the small ones and it's not significantly bigger than a B&S roller box tool.
    FYI More specs and sizes on Tangiflow boxes here http://www.tangi-flow.com/wp-content...ller-Boxes.pdf

  4. #24
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    if the rollers are behind the cutter (like someone said), how do you start the cut?
    Last edited by dian; 05-09-2017 at 11:58 AM.

  5. #25
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    Quote Originally Posted by dian View Post
    if the rollers are behind the cutter (like someone said, how do you start the cut?
    Yes, the rollers are behind the cutter. I chamfer the end of the stock......less than before as in the video.

  6. #26
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    you can also get or could get extended roller holders for box tools ken

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    Quote Originally Posted by Ray Behner View Post
    Yes, the rollers are behind the cutter. I chamfer the end of the stock......less than before as in the video.
    i just cant imagine how that works. the chamfer would have to hit the edge of the roller and the cutter at the same time. or does the stock get deflected and comes out true because the second roller straightens it out somehow?

  8. #28
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    I love box tools. And I like to set them up with the rollers in front of the cutter. You can do more then turn with them. I have set the rollers ahead of chamfer tool and cut large chamfers on the end of shafts that were sticking out of the spindle and because stock is supported by the rollers there is no chatter.
    Jimsehr

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  10. #29
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    Quote Originally Posted by jims View Post
    I love box tools. And I like to set them up with the rollers in front of the cutter. You can do more then turn with them. I have set the rollers ahead of chamfer tool and cut large chamfers on the end of shafts that were sticking out of the spindle and because stock is supported by the rollers there is no chatter.
    Jimsehr
    Here in the UK we call those ''ending tools''

    They are also used if you want a 2nd smaller dia to run concentric with the 1st cut.

  11. #30
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    Quote Originally Posted by camscan View Post
    The rollers are in line with each other but slightly behind the cutting tool.This means that the very first part of the cut is not controlled by the rollers,but it is only a very small part.
    For example: My 00RT is .025 behind the insert.

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  13. #31
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    Quote Originally Posted by Ray Behner View Post
    For example: My 00RT is .025 behind the insert.
    Just about right

    But don't forget, the larger the tool radius the further back the rollers have to be.

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  15. #32
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    jims - Your inbox is full. Thanks for the video link. VERY cool!

    Quote Originally Posted by jims View Post
    I love box tools. And I like to set them up with the rollers in front of the cutter. You can do more then turn with them. I have set the rollers ahead of chamfer tool and cut large chamfers on the end of shafts that were sticking out of the spindle and because stock is supported by the rollers there is no chatter.
    Jimsehr


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