RE: [CAD_CAM_EDM_DRO] Re: making an ali flexible coupler

I'm not sure that I'm visualising this correctly. Are you referring
to an Oldham coupling?

John Haddy
Sydney, Australia

> -----Original Message-----
> From: Don Rogers [mailto:Don@...]
> Sent: Tuesday, 11 November 2003 1:32 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: making an ali flexible coupler
>
>
>
> >The rubber spider that's inserted between the two
> >coupling halves allows for misalignment.
>
> The spider coupling does not take kindly to mis-alignment. It will
> tolerate a small amount of mis-alignment, but will wear out
> rather quickly
> if there is more than an thousandths or two of vertical or
> horizontal miss
> alignment, or more than a few minutes of angular
> mis-alignment. They can
> transfer heavy loads though and do provide an vibration
> isolation between
> shafts. The spider coupling is designed to be a single
> direction coupling,
> so there is a lot of backlash in them. All in all, they are
> not a good
> choice for a CNC coupling.
>
> An easier home made coupling might be patterned off a old
> (1960s) Ford
> steering column to steering box coupling. It was a hub that
> was attached
> to the shaft, and had a very flat U shaped yoke with a flat surface
> perpendicular to the shaft. These two halves were attached
> 90 degrees
> apart on a rubber/fiber disk. It allowed for quite a bit of
> angular miss
> alignment as well as some vertical or horizontal miss alignment, and
> lasted for many years (unless you were in the mid-west and
> the floor boards
> of your truck cab were rusting out). It also gave a very smooth and
> undetectable backlash feel to the steering. I don't have a
> drawing but
> could do a back of a napkin one if you wanted to see it.
>
> Don
>
>
>
>
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