Please, I did not in any way mean to be unfair to EMC. I did not mean it in that way at all.
EMC is a fantastic program. What I mean is that by doing the electronic gearing there is no way to avoid a condition where a stepper motor is operating at a step rate where resonance is present. It will happen and there is not anything EMC can do to prevent it. Its just a condition of steppers that cannot be avoided. It's hard to read E-mail and not have the writing be taken in the wrong way. Don't take my comments to be bashing EMC in any way. It has been everything I have been looking for in CNC control. I have no issues with EMC at all. It's a fantastic package and there has been a ton of work put into it. Jim C Gene Heskett <[EMAIL PROTECTED] izon.net> To Sent by: "Enhanced Machine Controller (EMC)" emc-users-bounces <emc-users@lists.sourceforge.net> @lists.sourceforg cc e.net Subject Re: [Emc-users] Stepper speed 03/10/2008 09:38 AM Please respond to "Enhanced Machine Controller (EMC)" <[EMAIL PROTECTED] sourceforge.net> On Monday 10 March 2008, [EMAIL PROTECTED] wrote: >Kirk, > >Yes, I have used the dampers and they work well. My motors at home don't >have the dual shafts. I made due with some old motors. Things are working >well for me right now without them. I could run faster if I had them on >the motors. > >Here are work, I have seen the results and it's not pretty. Steppers do >have a lot of oscillations during stepping. There is always a resonant >speed where torque falls way off. >With the electronic gearing of EMC, >there is no way to avoid this condition. This statement is grossly unfair to emc. This problem will exist for stepper motors regardless of the driver software chosen. >One just has to make sure there >is still enough torque to continue the motion without breaking the phase. > >Jim C > > > > > Kirk Wallace > <[EMAIL PROTECTED] > company.com> To > Sent by: "Enhanced Machine Controller (EMC)" > emc-users-bounces <emc-users@lists.sourceforge.net> > @lists.sourceforg cc > e.net > Subject > Re: [Emc-users] Stepper speed > 03/07/2008 03:13 > PM > > > Please respond to > "Enhanced Machine > Controller (EMC)" > <[EMAIL PROTECTED] > sourceforge.net> > >On Fri, 2008-03-07 at 14:19 -0500, [EMAIL PROTECTED] wrote: >> Ian, >> >> I am using the basic output from HAL via a 1284 parallel printer port, >> (mode 2). The stepper motor drivers are just doing the chopping to limit >> current. I didn't change HAL in any way. >> >> The one thing you might try is to limit the acceleration. >> >> I was surprised when I raised the motor voltage and started missing > >steps. > >> That was not at all what I expected. I am driving a 2.5mm pitch lead > >screw > >> with 1.8 degree steppers (NEMA 14) >> >> Jim Combs >> Lexington, Ky > >Others on this list have used mass and/or fluid dampers to deal with >stepper resonance problems. > >I wonder if a high resolution encoder and Halscope could be used to >study inter-step movement at speed? Maybe running on another EMC PC? > -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) I'd put my money where my mouth is, but my mouth keeps moving. -- Larry Wall in <[EMAIL PROTECTED]> ------------------------------------------------------------------------- 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 ------------------------------------------------------------------------- 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