On 11 May 2012 14:45, Jean <[email protected]> wrote: > Hello, > I'm new to linuxcnc. I want to port linuxcnc to ARM9(IMX257) . but > when i test linuxcnc with a nc program on my ubuntu pc in simulation > mode(configs/sim/axis_mm.ini, G64 P0.005, max_velocity is 200mm/s, > max_acc is 1000m/s2), it is very slow compare to Power Automation > CNC(PA8000, based on windows) with same max velocity and acceleration. > PA8000 has looking-ahead with 200 blocks. > I googled internet, someone said that linuxcnc G64 lookahead is only > one segment 'deep' . Is it possible to increase more lookahead blocks?
It is possible, and it might even happen, but it isn't trivial. There was a recent change to the motion system (only in Master) that allows different acceleration at each end of the block, and that apparently can make a big difference. There is a general feeling that G-code which needs 200 blocks of lookahead to run fast is bad G-code. But you can even agree with that, and still have the G-code and need to run it. There is discussion ongoing on a new motion planner structure that will allow more lookahead, but it is not clear if it will happen. -- atp The idea that there is no such thing as objective truth is, quite simply, wrong. ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
