2015-11-09 8:49 GMT+02:00 Eric Keller <eekel...@psu.edu>: > there were hydraulic milling machines sold based on Moog hydraulics > and Bridgeport iron. I assume those two companies could screw things > up, but the world has moved on. To move a long distance takes a lot > of power. Small movements with a lot of force behind them are really > easy, that's why you see fatigue machines and other shorter stroke > machines with hydraulic servo. > > AFAIK the problem of hydraulic actuators is low efficiency. There should be a high pressure high rate pump to provide high velocity and force. But when the actuator doesn't move it all goes via baypass just heating the fluid. Probably adjustable pump could help but it gets more complicated (just a guess).
-- Andrew ------------------------------------------------------------------------------ Presto, an open source distributed SQL query engine for big data, initially developed by Facebook, enables you to easily query your data on Hadoop in a more interactive manner. Teradata is also now providing full enterprise support for Presto. Download a free open source copy now. http://pubads.g.doubleclick.net/gampad/clk?id=250295911&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
