Hi Jon Can you tell me what midband resonance is. Could it have anything to do with leadscrews that vibrate/ whip around a bit Thanks Aaron > ----- Original Message ----- > From: "Jon Elson" <el...@pico-systems.com> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] Need for speed > Date: Mon, 16 Mar 2009 11:37:14 -0500 > > > aaron moore wrote: > > Hi > > > > I have recently built a 1500mm x 1500mm gantry style router. I > > am using EMC to run three FL86STH156-4208 11.96 Nm stepper > > motors, with 16mm x 4mm pitch trapezoidal screws. The gantry > > weighs some thing like 70kg. It works pretty well except the > > fastest movement I can achieve for x and y is around 15 mm per > > second before the steppers start complaining. I know the spigots > > on the end of the screws were not turned very concentrically, (I > > used a crappy lath)...could this be the reason for the lack of > > speed? > > > Does it make grinding noises BEFORE the steppers lose sync? Let's see, > 4 mm pitch and 15 mm/second, assuming direct drive of the screws. That > would be 15/4 = 3.75 revs/sec or 225 RPM. Ahhh, that is right in the > range of "midband resonance". What motor drives are you using? > If any flavor of full step drive, that is almost certainly your > problem. You might want to try a good microstepping drive. > > Otherwise, you may need a hardware step generator, or possibly a faster > computer to make smoother trains of pulses. > > Jon > > ------------------------------------------------------------------------------ > Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are > powering Web 2.0 with engaging, cross-platform capabilities. Quickly and > easily build your RIAs with Flex Builder, the Eclipse(TM)based development > software that enables intelligent coding and step-through debugging. > Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users
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