Re: Re: Re: Hexapod question

> From: Jon Elson <elson@...>
>
> Paul wrote:
> >EMC hexapod kinimatics provides for the three standard cartesian X, Y,
> > and Z moves. In addition, Roll, Pitch, and Yaw can also be used -
> > This gives around 15 degrees of "rotation" depending on the mechanics
> > of the platform.
> >
> >For reference,
> > http://www.i-way.co.uk/~storrs/lme/LMEHexapodMachine.html has some
> > detailed drawings of key parts of a hexapod.
> >
> >Regards, Paul.
> >
> >
> >On Wednesday 10 December 2003 6:55 pm, Jon Elson wrote:
> >
> >
> >>Note that EMC still doesn't give a full Stewart platform
> >> implementation, as it doesn't handle rotations of the platform, just
> >> translation.
> >
> >
>
> So, these limits on rotations are primarily in the mechanical
> arrangement, not
> EMC? Has it always been that way, or was there some limitation in EMC
> that has been fixed?
>
> Still, +/- 15 degrees is not going to make it possible to completely
> machine 5 sides of a box.

RPW was implemented for the last time we showed the cable hexapod at
NAMES. Must have been 2000.

This +/- 15 comes from the NIST cable hexapod. It has more to do with the
mechanics of Stewart platforms rather than any inherent limitations in
the EMC.

One of the hexapods (model 2) that is demonstrated on Till's site can get
the platform nearly 90 degrees to the bed.

Ray