> We have a robotics application which puts fairly high reversing loads > on caster wheels. We are looking for a source for heavy-duty casters ... Can you add a 360 degree rotating trailing arm somewhere in the middle - or a "static strap" :-)? Given the needed resistance a strap could be reasonably rugged with a relatively light loading of eg carbon black. An UHMWPE wear end should last a long while. Or, is spraying with a conductive coat on the castor face acceptable. Nickel loaded sprays are available, or making something custom with carbon black (again). (Maybe galvanising paint :-) ). Could you bond a multidisc wheel together with summat tough in layers with summat conductive? R -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist