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
