Thanks Dave On 15/10/2015 11:34 PM, David Rotigel wrote: > See: http://biggeekdad.com/2015/10/bridge-building-machine/ The RR building machine is also interesting! > Dave > _______________________________________________ > SEL mailing list > SEL at lists.stationary-engine.com > http://www.stationary-engine.com/mailman/listinfo/sel