Helical couplings are available in many sizes and torque ranges in 
stainless steel and aluminum....
Helical Products home..
http://www.heli-cal.com/cm/Home.html
one can find many couplings available on ebay like
http://cgi.ebay.com/ws/eBayISAPI.dll?VISuperSize&item=140415497363 
<http://cgi.ebay.com/ws/eBayISAPI.dll?VISuperSize&item=140415497363>
just do a search for Helical Coupling...
Hope that helps Erik

Wayne

On 03/07/2010 4:58 AM, Erik Christiansen wrote:
> On Fri, Jul 02, 2010 at 08:47:29PM -0500, Jon Elson wrote:
>    
>> I put an encoder on the end of the ballscrew with a helical-slit coupling.
>> You can see some photos here :
>> http://jelinux.pico-systems.com/CNCconv.html
>>      
> Hey, that sounds a bit easier than making Oldham couplings.
> About how many turns of helix did you use?
>
>    
>> Please excuse the awful pictures, I ought to redo them.
>>      
> Somewhat higher resolution would help anyone taking a keen interest in
> details. If the coupling is visible from some angle, there's an
> appreciative audience of at least one for an image of it. ;-)
>
> Erik
>
>    
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