Re: [CAD_CAM_EDM_DRO] Excel to Gcode

Hello afogassa,

I just reread your post and checked to find the appropriate Excel
function. You are probably finding the angle with ATAN2(X,Y) and getting
results between -pi and +pi. Then multiplying by 180/pi to convert from
radians to degrees.

If you find the angle with pi+ATAN2(-X,-Y) you will get the same answer
but between 0 and 360 degrees.

But is that 360 degree rotation actually necessary? Won't the 4th axis
take angles in any quadrant including less than zero and greater than
360 degrees?

Tom Hubin
thubin@...

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afogassa wrote:

>
> Hi All,
> I'm trying to work with excel to generate a toolpath for my 4th axis.
> got a point file from rhino into excel then did the trig to find the z
> axis position and A axis angle position from the original x and Y.
> The problem is: when going past 180 degres the toolpath gets mirroed
> on top of the other 180 deg.
> I think I should out put the the degress from 0 to 360 but can't
> find a formula to do that.I'm using a circle divided into 4 so the
> angles changes from let'say; -65, 65....on every quadrant.
> Have tryed to subtract 90 deg from the quadrante but it still gets
> mirroed.
> BTW: I need to cutout odd shape windows on a ovalshape tube.
> Every high end cam software I've tryed don't want to follow a odd
> shape line on top off surface when using the rotary axis, it only
> wants to machine the Whole surface .Tryed mastercam, powermill, and
> Vector,
> any Ideas?