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

Sorry,

Hit the send button before I'd finished...

This is what I'm imagining:

www.beldenuniversal.com/couplings/oldham/

John Haddy
Sydney, Australia

> -----Original Message-----
> From: John Haddy [mailto:jhaddy@...]
> Sent: Tuesday, 11 November 2003 1:47 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: 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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> http://groups.yahoo.com/group/jobshophomeshop I consider
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>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
> aol://5863:126/rec.crafts.metalworking or go thru Google.com
> to reach it if you have trouble.
> http://www.metalworking.com/news_servers.html
>

http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there,
for OT subjects, that are not allowed on the CCED list.

NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
bill
List Mom
List Owner



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