My question was the opposite. If you set the max acceleration lower than the actuator is capable of, I assume it will work fine and just take longer to ramp up to full speed than it could in theory.
jerry On Thu, Aug 27, 2015 at 1:50 PM, Karlsson & Wang < nicklas.karls...@karlssonwang.se> wrote: > If you try to accelerate the actuator above what the actuator is capable > of the best thing that could happen is it will not keep track of the > position and the other thing are more bad. > > > > > On Thu, 27 Aug 2015 11:35:04 -0700 > Jerry Scharf <jsch...@finsix.com> wrote: > > > Hi, > > > > One last question about this. Is there any harm in reducing the max > > acceleration below what the actuator is capable of? I wouldn't seem like > > it, but I want to be sure. > > > > I know it will slow things down a bit, but this is by far the fastest > part > > of my system and only moving a short distance. > > > > jerry > > > > > > On Tue, Aug 25, 2015 at 5:04 PM, TJoseph Powderly <tjt...@gmail.com> > wrote: > > > > > Jerry I didnt answer your question. > > > to measure acceleration there's an industry standard 'step' test. > > > The 'step' is to apply the voltage required to achieve max velocity. > > > This voltage **instantly** rises from 0 to the value needed for max > > > velocity. > > > Thats where the name 'step' comes from, > > > Its a square edge on a scope. > > > > > > A second measurement is now needed, > > > Some way to determine _when_ the > > > maximum velocity is actually achieved. > > > > > > Old school dc motors gave us Tachos so this was easy. > > > I dont know what you can put together. > > > You could attach a voice coil to the end, I suppose. > > > Measure when the output voltage goes constant ( at max vel ) > > > A scope should show a 'knee' starting at 0Volts. > > > > > > But if you measure time from the 'step' until the max vel, > > > you have the precise acceleration _time_. > > > > > > The acceleration time divide by time is the acceleration > > > > > > ( example .240 Sec accel time to achieve 800mm/minute velocity > > > is .24 sec to achieve 13.333mm/sec > > > is 55.555 mm/s/s > > > > > > 3.15"/sec / 0.02ec = 157.5in/s/s ) > > > > > > HTH > > > TomP > > > tjtr33 > > > On 08/25/2015 04:09 PM, Jerry Scharf wrote: > > > > Hi, > > > > > > > > My quick scan of the docs didn't find an explanation for how to > calculate > > > > this from manufacturer specs rather than experimentation. I want to > make > > > > sure I am doing this right. > > > > > > > > The actuator is rated a 3.15 inches per second and it can reach full > > > speed > > > > in under .02s for the load I will be putting on it. If I use a = v/t, > > > this > > > > comes out to about 150 inches per second square. Does this look > right? > > > > > > > > The actuator is a SMC LXPB2BD-50S that I picked up used. > > > > > > > > jerry > > > > > > > > > > > > > > > > > ------------------------------------------------------------------------------ > > > _______________________________________________ > > > Emc-users mailing list > > > Emc-users@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > > > > -- > > Jerry Scharf > > FINsix IT > > 650.285.6361 w > > 650.279.7017 m > > > ------------------------------------------------------------------------------ > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------------------------ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Jerry Scharf FINsix IT 650.285.6361 w 650.279.7017 m ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
