How do you use polar interpolation


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    Registered positiverake's Avatar
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    Default How do you use polar interpolation

    I was wondering if anybody can tell me how to mill on a live tool lathe with no Y axis, G112 polar interpolation, it looks like it ties the X and C togther ? is there a formula to figure this out,you know hex,square, raduis around the corners ect..

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    Registered CNCRim's Avatar
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    If you look at the program XC closer it is milling program, but instead XY coordinate now it is XC(where Y used to be now it is C), and X location is double.
    That's it is.

    The best way to learn is trial error.


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    Registered oldjohn's Avatar
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    What machine? What control? What cad cam software? Face? Cross milling?
    If you use Mastercam I may be able to help.



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    Registered positiverake's Avatar
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    Mori seiki Z1000 and dawoo puma, both have fanuc controls, no cad-cam, programing at the machine, just trying to understand how the G112 works, newtexas2006 post sounds good, have'nt tryed it yet, thanks for the reply



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    Quote Originally Posted by positiverake View Post
    Mori seiki Z1000 and dawoo puma, both have fanuc controls, no cad-cam, programing at the machine, just trying to understand how the G112 works, newtexas2006 post sounds good, have'nt tryed it yet, thanks for the reply


    Just look at the "C" axis as if it were "Y". Program it as a 3 axis machine using X,C and Z do not try to think to much about how it works the G112 does all the thinking for you.
    I have programmed Mori MC's fpr years and it is pretty far out how it works. Just remeber that oce the G112 is on you now have a 3 axis machining center and not a 2 axis lathe

    Bluesman



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    Like they said, Dont think to hard, its easy after you get thru the brain strain..

    Just remember to program C in Radius dimenision's and X in Diameter dimenision's....
    you also have to turn cutter comp on and off outside the G12 thru G13 programming..

    Its fun....



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    Default Re: How do you use polar interpolation

    Hi, I know your post is really old. but I was wondering if you could help me with the same issue. Thanks



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    scaring mice @ north pole deadlykitten's Avatar
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    Default Re: How do you use polar interpolation

    hi / 2 do list :
    ... cartesian coordinate system ( x , y )
    ... polar coordintate system ( r , alfa )
    ... transition between each other ( x = r cos alfa , y = r sin alfa )

    when milling with a live tool, on a nonY lathe, it may be possible to use both cartesian and polar systems ( swicthing between them with a G code )

    imagine a toolpath made of a line + arch :
    ... line between point A and B
    ... arch between point B and C

    coordinates :
    ... A ( xa ,ya ) and ( ra, angle_a )
    ... B ( xb ,yb ) and ( rb, angle_b )
    ... C ( xc ,yc ) and ( rc, angle_c )
    ...... first paranthesis is cartesian, 2nd is polar; if you know one of them, you may determine the other, by using the transformation ( x = r cos alfa , y = r sin alfa )

    kind of pseudocode for cartesian :
    Code:
    G00 XA YA ( rapid at 1st point )
    G01 XB YB ( line to 2nd point )
    G02 XC YC ( arc to 3rd point )
    kind of pseudocode for polar :
    Code:
    G00 rA uA ( rapid at 1st point )
    G01 rB uB ( line to 2nd point )
    G02 rC uC ( arc to 3rd point )
    core G-code sample for cartesian :
    Code:
    G... ( activate cartesian system )
    G00 X... Y... ( rapid at 1st point )
    G01 X... Y... ( line to 2nd point )
    G02 X... Y... parameters_for_arch ( arc to 3rd point )
    *coordinates should be inserted where the dots are : X=x , Y=y
    * those parameters_for_arch are required, so to identify a single arch between point B and C ( otherwise, there will be an infinity of arches between those 2 points )
    core G-code sample for polar :
    Code:
    G... ( activate polar system; it may be default, so no need to specify it )
    G00 X... C... ( rapid at 1st point )
    G01 X... C... ( line to 2nd point )
    G02 X... C...  parameters_for_arch  ( arc to 3rd point )
    * coordinates should be inserted where the dots are : X = 2 * r , C = alfa
    at this point i may share a complete G-code, but ... well, your move now


    it helps to undersand all these
    if you don't have time, than is good to have a nice postprocessor, that will do the work for you ...


    if you have neither, than you may be floating for a while in between any questions ?

    Last edited by deadlykitten; 04-17-2018 at 03:52 AM.
    Dub FX 'NO REST FOR THE WICKED' feat. CAde & Mahesh Vinayakram, https://www.youtube.com/watch?v=rBmMzabdEKQ




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How do you use polar interpolation

How do you use polar interpolation