Re: [CAD_CAM_EDM_DRO] re: more R,P,Y wasRe[12]: emc really needs

Terry,

Part of the problem is that we are mixing two kinds of applications.

1) My understanding of A, B, and C axes is that they are usually used for rotary tables mounted on a conventional 3-axis system. In
this case you would only use one rotational axis at a time. More than one puts you into the second class below. I imagine supporting
a fourth rotary axis would be a pretty straightforward extension of a 3-axis CAM system. You might not want to bite off a fourth
axis in the first implementation, but you might leave room for it in the design and code architecture.

2) Yaw, pitch, and roll, and probably the others mentioned in the hexapod material, refer to general orientation of a part or
spindle on a 5-axis machine. These machines control the orientation of the tool as well as the tip position. Dealing with 5-axis
machining and 3D orientations is a much more complicated job. Unless someone creates a cheap hexpod, it's not useful to most CAM
users either.

Andy Anderson

"Terry L. Ridder" wrote:

> hello;
>
> actually this coordinate reference and axis names
> is about as clear as mud.
>
> i have been reading several of the hexapod web sites
> and at least two refer the additional 3 degrees of
> freedom as pitch, roll, yaw. one refers to them as
> theta-x, theta-y, & theta-z. yet another refers to
> them as q1, q2, & q3. yet another refers to them as
> x', y' & z' ( that ' indicates "prime").
>
> pitch, roll, & yaw i can understand given that the
> hexapod was originally designed for flight simulators.
> the rest i have not a clue.