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Thread: Machining circle with four lines(PROJECTIONS) at 90 Degrees apart

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    Question Machining circle with four lines(PROJECTIONS) at 90 Degrees apart

    I HAVE A 3 AXIS DECKEL CNC MILLING MACHINE RETROFITTED WITH A FANUC Series-Oi.Mi CONTROLLER. WHEN CIRCLE IS MACHINED WE ARE GETTING FOUR LINES(PROJECTIONS) AT 90 DEGREES APART.PLS HELP TO SOLVE THIS PROBLEM.
    Last edited by Petro; 12-31-10 at 12:06 PM.

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    Default Re: Habibulla

    It would really help if you post your code so we can take a look at it and see what is wrong with it.

    Stevo
    (The opinions in this post are my own and not those of machinetoolhelp.com and its management)

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    Default Re: Habibulla

    Stevo:
    I totally agree, show us your program and we can help.
    I have a number of examples on my website that will show you how to do it.
    Heinz.
    www.doccnc.com

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    Default Re: Habibulla

    G00 g28 g91 z0;
    g00 g55 g90 g17 g94 x0 y0;
    d10;
    g43 h7 z2;
    g1900 d7 l1.5 k0;
    g00 x2.5 y0;
    g00 z0.1;
    m03 s2000;
    g01 z-0.5 f25;
    g01 g41 x2 y0 f25;
    g03 x2 y0 i-2 j0;
    g00 z2;
    m05;
    g00 g28 g91 z0;
    m30;
    Last edited by shabibullah; 12-29-10 at 12:48 AM.

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    Default Re: Habibulla

    G00 g28 g91 z0;
    g00 g55 g90 g17 g94 x0 y0;
    d10;
    g43 h7 z2;
    g1900 d7 l1.5 k0;
    g00 x2.5 y0;
    g00 z0.1;
    m03 s2000;
    g01 z-0.5 f25;
    g01 g41 x2 y0 f25;
    g03 x2 y0 i-2 j0;
    g00 z2;
    m05;
    g00 g28 g91 z0;
    m30;

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    Default Re: Habibulla

    I suspect it's not a programming problem but a mechanical/electrial problem. Check both axis for any backlash. The points you described are when the axis reverse direction. There's also an outside chance either the tool holder is loose (pull stud) or the tool in the holder is loose, again reversing direction can be effected both ways. I suspect backlash problems. Electrially would be your drives need tuned. If you machine a diamond shape on a 45 degree angle the dimensions should be the same all the way up on both sides of the diamond. That will generally point out a drive/motor problem. Be sure the approach to the 45 degree cut doesn't generate any axis reversal.
    I still suspect just backlash.
    Good luck!

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