Re: Universal head was

Hugh,

Looks like you understand how these rotary axes relate... BUT,

This setup is usually called A and B. Why? The 90 degree position of
A you describe is the "starting" position. Remember that zero degrees
in a cartesian coordinate system is at 3 o'clock... (not noon)

Hope this helps.

Ballendo

P.S. These are regularly added to 3 axis machining centers to get 5-
axis parts made.

--- In CAD_CAM_EDM_DRO@y..., Hugh Currin <currinh@O...> wrote:
> Ballendo:
>
> Maybe he means a "Tilting Rotary Table". If not I've been
wondering how this
> is termed in G-world.
>
> It is a two axis thing. A rotary table mounted on a gimble. The
same could be
> achieved using two rotary tables. Mount one rotary table for say an
A, then
> mount a second rotary table on the first as say a C axis. So when A
is at
> zero orientation C's axis is pointing up, Z, and correseponds to a
C in this
> orientation. But if A is rotated the "second axis formerly known as
C" is not
> aligned with the Z axis. At an A of 90 degrees, the "axis formerly
known as
> C" is now aligned with the Y axis, B. Would the "second axis
formerly known
> as C" be refered to as C in all these positions?
>
> Thanks. :-)
>
> Hugh Currin
> Klamath Falls, OR
>