Re: [CAD_CAM_EDM_DRO] Hexapod ball joints, Moglice

Graham Stabler wrote:

>After the recent threads on building hexpods and on the rotobot
>concept I started thinking about building one. I decided I wanted to
>have decent ball joints as in the commerical versions to avoid
>problems with gimple lock etc etc yada yada
>
>So I suggested in the rotobot thread the use of Moglice to produce a
>ball joint.
>
>It is not cheap stuff so I am thinking along the lines of a hybred
>construction. I will probably turn a cup to house the ball and bore
>it in steps to a rough approximation of a socket. Then I'll suspend
>the ball (suitably tapped etc, that's the next problem) within the
>cup and pour in the Moglice. Obviously the ball will have to have a
>release agent layer but at the end a decent joint should be produced.
>
>The question I have is on the machinability of Moglice, if I try to
>make a one piece ball socket, will I be able to work at the
>aperture. i.e. I will fill the socket such that a lot of the ball is
>covered but then I need to increase the size of the hole so that I
>get plenty of movement.
>
>

It is quite machinable. I did quite a bit of scraping of a Moglice
surface that
was to thick. It is about half the effort to scrape as soft cast iron,
maybe even
less than half.

How are you going to get the ball out after pouring the Moglice in?

Jon