Re: what is 4 axis and 5 axis?

--- In CAD_CAM_EDM_DRO@y..., Jon Elson <elson@p...> wrote:

> cadcamcenter wrote:
>
> > What terminology should we refer a cnc'ed Sherline 2000 which
> > has "8" degrees of freedom (they include the spindle rotation
> > as 1 axis)?
>
> I don't know what this 8 degrees of freedom means. 6 degrees of
> freedom generally means 3 translational axes and 3 rotational
> axes. The 3 translational are standard. I really don't think
> the Sherline rotary table can be stacked to get 5 axes. I think
> it would get very wobbly. Stacking 3 rotary axes turns out to
> almost never be necessary.
>
> Jon

Sherline's "8 degrees of freedom" is just marketing hogwash.
Most of their 8 degrees are for setup only. By their standards,
a standard Bridgeport has 9 degrees, without a rotary table:

1) Table moves left to right - X axis
2) Saddle moves in and out - Y axis
3) Knee moves up and down - Z axis
4) Turret rotates
5) Ram moves in and out
6) Head tilts forward and back at the knuckle
7) Head tilts left and right
8) Quill extends and retracts - alternate Z axis
9) Spindle spins around

I'm surprised they don't try to count opening and closing
the vise as a degree of freedom...

John Kasunich