Re: degrees of freedom Was: Angle Iron Ways

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Stephen Wille Padnos
<spadnos@...> wrote:

>
> Hi there.
>
> I think that four struts aren't enough, unless you can control the
>joint angles in addition to the strut length.

Yes and no. It depends what you call a strut. It you mean an
idividual rod then you are perfectly correct but you can build your
struts out of two rods arranged as parallelograms, this gives angle
contraint. So you always must contrain in 6-axis while moving in the
number of axes you want to move in. This way it is possible to built
2-6 axis parallel machines.

check out the diagrams on my page:

http://www.indoor.flyer.co.uk/kinematics.htm

Graham