Opps Sorry mm 5mm per second on a 1.5m x 1.5m gantry style router. Is this not reasonable? Aaron
> ----- Original Message ----- > From: "John Kasunich" <[EMAIL PROTECTED]> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] Micro stepper driver MSD542 / KL-5042 > Date: Mon, 19 May 2008 15:04:43 -0400 > > > aaron Moore wrote: > > The stepconfig wizard only seems to work when setting up a > > completely new configuration, There after I cannot test the axis > > when modifying the configuratiuon. > > > > I just tried reducing the acceleration.... velocity is now 5 and > > acceleration 1 It seemed to make the text miss-alignment slightly > > worse. > > > > Is this really such a hit and miss procedure? I just spent a > > fair amount of money and I figured there would be a set formula > > for given equipment, > > > > But thanks for your efforts > > > > You've never specified your units, so I'm going to assume inches. > Please correct me if I'm wrong. > > You say "velocity is now 5 and acceleration is 1". > > What kind of a machine do you have? I got the impression that this was > a small stepper based machine - a Sherline or something of that class. > If so, I find it rather astonishing that you can get 300 inches per > minute from it. > > Velocity is in inches per second (this is in the documentation). Five > inches per second times 60 seconds in a minute is 300 inches per minute. > Do you really expect your machine to be that fast? > > Acceleration is in inches per second per second. You have "1" - that > means it will take your machine five seconds to reach its full speed of > 5 inches per second, and five more seconds to slow down and stop. > During the 5 second accel, it would travel 12.5 inches, and another 12.5 > during decel. I can't think of any machine that would have this > particular combination of values. It would have to have long axes, huge > inertia, very low friction, and very weak motors. > > Stepconf may be a "wizard", but it cannot do magic. The numbers you > give it must make sense for your machine. And if you really do have a > very strange machine, it may be out of the range of things stepconf was > intended to handle, and need special treatment. > > Don't get me wrong - EMC is quite capable of controlling a machine with > those "strange" characteristics. But you aren't going to get typical > machine tool performance out of it. Somehow I don't think that is what > you really have - instead, you gave stepconf incorrect values for > velocity and/or acceleration, and stepconf and EMC are doing the best > they can with the data you gave them. > > You need to make sure you understand what the numbers meanm, and apply > some sanity checks to them. You also need to make sure that when you > run stepconf's test, the machine actually does roughly what the numbers > say it should be doing. If you gave stepconf 5 and 1 for velocity and > accel, then the test should have taken 5 seconds to accel, 5 seconds to > decel, and traveled 25 inches. A ruler and a watch are adequate to > measure those results. > > If the test doesn't match the numbers, it is time to stop and figure out > why. > > Regards, > > John Kasunich > > > ------------------------------------------------------------------------- > 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 > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Powered by Outblaze ------------------------------------------------------------------------- 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
