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Thread: 90 degree tube notching method without a drill press.

  1. #11
    bruce.desertrat's Avatar
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    I applied a little google-fu: Tube Coping Calculator

  2. The Following 2 Users Say Thank You to bruce.desertrat For This Useful Post:

    PJs (06-21-2018), Tuomas (06-21-2018)

  3. #12
    Saltfever's Avatar
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    The DOS program I remember in the 80's was called TUBEFIT. I couldn't think of it the other day when I posted. Thanks Bruce for the link above which triggered my memory. Here is more information on how Dan Hopper created the program. I wish I could find a DOS copy. Online calcs are fine but its a much more secure feeling having a floppy in the shop. Yes, I am that old!

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    bruce.desertrat's Avatar
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    Here you go! Dan Hopper's TUBEFIT Program (There was a link towards the bottom of the online calc page link above.) Now all yah gotta do is find a floppy disk! ( and a floppy disk drive to read it...)

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    PJs (06-21-2018)

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    mklotz mklotz's Avatar
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    If you have an operating system that no longer supports DOS, you can use DosBox, an emulator program which emulates an IBM PC compatible computer running a DOS operating system.

    It's well known enough to warrant its own Wikipedia entry...

    https://en.wikipedia.org/wiki/DOSBox

    It can be downloaded here...

    https://sourceforge.net/projects/dosbox/

    This is what I use to run my legacy DOS programs and it works very well. I also recommend it on my web page to run the DOS programs there.
    ---
    Regards, Marv


    Home Shop Freeware
    http://www.myvirtualnetwork.com/mklotz

  7. #15

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    Quote Originally Posted by bruce.desertrat View Post
    I applied a little google-fu: Tube Coping Calculator
    On the first page I immediately though of simply writing some kind of web application to do this that will auto generate images... but I guess there is one already & there is even stand alone one available.

  8. #16
    [email protected] tonyfoale's Avatar
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    I missed this post when it was made but I have had to notch thousands of joints. In the 70s and 80s when I had a business making motorcycle chassis. Unless the wall is thick compared to the diameter then 2 straight saw cuts will get you very close to a well fitting joint. The cuts can be made with hacksaw, cutoff wheel in an angle grinder as Tuomas did or a full size cutoff saw.
    This method works for 90 deg joints but also for those at different angles. For one off and for the first frame of a new design I would use a hacksaw, which was generally the fastest way. For production frames I had a list of cutoff saw angle settings so that unskilled helpers could take care of the work.
    Here is a page from my book Motorcycle Handling and Chassis Design

    90 degree tube notching method without a drill press.-tubeprofiling.jpg Click for full size.

    Also on my website in the freeware section there is some software "TubeMiter" which prints out templates for tube notching which handles tubes of different diameters and angles. I don't use it but only because the two cut method above works so well for me.

    PS. I must mention that not everybody has success with the two cut method, you have to have a good eye for the angles and distance from the end to cut. I have a friend who has built some motorcycle chassis and he has never had success with the method.

  9. #17

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    Have fun with this Tabbed TubeNotcher Pattern Creation Tool.
    It took some time to find it.

    TubeNotcher Pattern Creator Tool


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