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Re: Where to get lightweight flexible coupling?
http://www.fenner.com/btlhome.nsf/00...2568b2004df9eb
http://www.pennaircatalogs.com/Supplier%20Catalogs/Vescor/CEC_Cplg.pdf#search='cec%20coupling
Not sure where you can still get them, but it looks like you need the C100 hub style. We used the Nitrile (Buna-N?) spyders in the past since they are the softest and offer the most misalignment error.
You would need to make a sleeve to make the bore smaller as Andy has described in the past. Simply broach a hex in the coupling and make a corresponding insert out of aluminum or steel with the 1/2" keyed bore you require.
__________________
-Travis Covington
2008-2017 - Engineering Mentor of Team 254
2001-2008 - Engineering Mentor of Team 968
1998-2001 - Mechanical Director/Driver/Member of Team 115
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