I'm not sure if you noted that the same applies to MAX_ACCEL (under [AXIS_*]). Now to the warning you're seeing, the max frequency of 12693 is determined by the scale (50) and the base_period (40000). I notice the base_period (in [EMCMOT]), is quite large (which means very little speed possible). I would try to lower that value, until you notice the GUI gets a bit sluggish (or you get warnings from emc2 about missing realtime deadlines), then increase it a bit. With 20000 instead of 40000, you'll have double steps/second available, which will allow you to go up to 450. 15000 is not very uncommon for a ~1GHz machine, but it depends on the machine.
Regards, Alex ----- Original Message ----- From: "Ian W. Wright" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Sunday, February 17, 2008 1:15 PM Subject: Re: [Emc-users] Stepper strangeness - mixed up ini? > Thanks Alex, > > I changed the MAX_ANGULAR_VELOCITY etc to MAX_VELOCITY in the axes > sections but left them as is in the TRAJ section as Brian had suggested > that this form was necessary there. I also increased STEPGEN_MAXVEL to 450 > in axis 3 section. This has now sparked error messages on startup of: > > "STEPGEN: Channel 3. The requested maximum velocity of 22,000 steps/second > is too high." > > followed by: > > "STEPGEN: The maximum possible frequency is 12693 steps/second." > > Now I just don't understand this as have had the A axis running quite > happily at F400 under G1 last week so how could this be?? > One other question - is the Stepgen maximum frequency governed by the > processor speed of the PC - the current processor is 1.7Gig but I have > another machine I could use with a 2.8 Gig processor. > > I tried reading the manual on the ini file again but I guess my wetware > language processor is failing me as I came away still not understanding > just how stepgen, velocity and acceleration work and what I have done > wrong..... :-( > > -- > Best wishes, > > Ian > ____________ > Ian W. Wright > Sheffield UK > > "The difference between theory and practice is much smaller in theory than > in practice..." > > >>>>>>>>>>>I notice your angular axis has some weird values: > > MAX_ANGULAR_VELOCITY = 420.0 > MAX_ANGULAR_ACCELERATION = 7 > STEPGEN_MAXVEL = 200 > STEPGEN_MAXACCEL = 7.5 > > > you should have STEPGEN_MAXVEL higher then MAX_VEL.>>>>>>>>>>> > > -- > Best wishes, > > Ian > ____________ > Ian W. Wright > Sheffield UK > > "The difference between theory and practice is much smaller in theory than > in practice..." > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2008. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
