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
