Re: Hexapod question

Graham, Kevin,

Yeah, I missed the boat on the u-joint length...

Good news is, I did a mock up, and the "experiment" I suggested
works; though it is due to the re-positioniing of the struts rather
than the u-joint length.

Ballendo (humble)

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Graham Stabler" <eexgs@n...>
wrote:

> At first Ballendo I thought the same as you that the extra length
> beyond the joint would cause a problem but this is not the case.

If

> those levers as you describe them were shorter the situation would

be

> exactly the same and if the machine cannot handle a leverage beyond
> the plane of the pivots then it will not be very good when it comes
> to milling anything.
>
> The main proble is clearly the geometry of the legs, it is a table
> with six legs not a self supporting/stiffening structure as it
> stands. The bad effects of U joints will really appear when you

try

> to move the table on purpose (there are certain times when they

will

> tend to lock up if the movement is not done correctly) and any play
> will feel rather more like play than just general floppyness.
>
> JMHO
>
> Graham