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  1. #1
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    Aug 2006
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    156

    cnc controlled mandrel bender controlled by mach3

    hi well i have decided to try my best to design a cnc controlled mandrel bender for well bending tube (tube chaissis, motorcycle go-cart, buggy ect) by posting this it should keep me on track, from what i can find there has been alot of asking but no trying so ,(unless i am wrong) i am going to try, in the next couple weeks i am going to build the madrel bender, with electric over hydrolic and try designing the machine my thoughts so far are as follows.

    x will be to move the pipe forward towards being bent

    y will be rotation of said pipe

    x hopefully will be an encoder ect to stop the bend at certain amount ( 90 degrees ect).

    i will use mach 3 since i use it for my plasma cutter / router

    im not shure about producing the g code but even if i can jog a foot bend to 45 degrees rotate 40 degrees jog 2 feet bend 90 degrees with the keys than i will be happy at first.

    next would be building a screen set for mach 3

    and then hopefully software to make g-code so i dont have to type it out

    any input or anyone wanting on the band wagon chime in


    thanks again

    tim

  2. #2
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    Oct 2005
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    255
    Hi I am interested. What a mind bender this is. Center line radii to gcode mmm, but what the hell

    Paul

  3. #3
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    Aug 2004
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    411
    We had a computerized bender where I used to work, it was a 3 wheel job with the center wheel moving up and down. The center wheel moved with hydraulics, and had a gear rack that drove an encoder. We did have issues with accuracy. The machine tried to 'learn' when to shut off the hydraulic valve so that it ends up in the right spot. The cylinder had a flow control that had to be adjusted for different operations. The timing for the solenoid valve would be different every time you adjusted flow, so I think we would try to run it a cycle after making an adjustment to allow it to learn. Positioning error I think was around 10 to 20 thou, which made a big difference with what we were doing.
    May not be an issue with what you are doing, but I thought it might be helpful
    Good luck

    Joe
    If you try to make everything idiot proof, someone will just breed a better idiot!

  4. #4
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    Aug 2006
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    156

    hi

    just keeping this alive, hope towork on it soon

  5. #5
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    Jan 2006
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    481
    Hi guys

    have a look at this site for ideas www.offroadfabnet.com go into the forum section under Benders and Bending , some guys have already designed cnc_mandrel_tube_benders

    it is free to jion the website also

    There are a lot of cnczone.com memmbers there also

    cheers

  6. #6
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    Jan 2006
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    481
    Hi Timmy

    hows things going on in this thread?

    have a look at theses forums and websites http://www.offroadfabnet.com/forums/...read.php?t=218

    and some where in this blog there is a cnc mandrel tube bender built from scratch http://www.thewarfields.com/cnccookb...logSep2006.htm just have to find it

    if i find it again i will post it in here

    cheers

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