> 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
Low efficiency is certainly a broblem so unless there is other advantages it is never a point to use hydraulics for this purpose. Nicklas Karlsson ------------------------------------------------------------------------------ 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
