On Saturday 12 September 2020 00:55:52 Leonardo Marsaglia wrote: > > That link is to the true servo line they make, and which I have no > > experience with. What I do have experience with is their line of 3 > > phase steppers that think they are servo's. They are servo's > > internally but take the usual step/dir signals. 1000 ppr encoders on > > the motors. > > Hello Gene, > > I've seen those hybrid stepper motors are a pretty popular option now. > I frankly don't trust regular steppers at least for the machines I'm > used to retrofit. Are they a lot cheaper than a servo motor? Because > looking at how servo motor prices falled down I think today is more > than convenient to install servo motors without thinking it. At least > for the 2NM and above range IMO.
They are currently running something under $100 (with free ship) an axis from some of the far eastern venders for a 3NM. Drivers are getting smarter too as they now look at the error to see how much current to feed the motor. No dip switch to program the motor currents. So the 3NM nema 23 I put on the Sheldons Z is now running about 10F over ambient where the nema 34 ran 35F or more over ambient at half the speed. The 3 phase drivers are smaller than the DM860 I took out. Smaller even than a 2M542. I'm more than happy. > El vie., 11 sept. 2020 a las 18:46, Gene Heskett > (<[email protected]>) > > escribió: > > On Friday 11 September 2020 16:26:07 hubert wrote: > > > On 9/11/20 2:21 PM, Leonardo Marsaglia wrote: > > > > Helo to all, > > > > > > > > I found these on Aliexpress: > > > > > > > > https://www.aliexpress.com/item/1005001376368510.html?spm=2114.1 > > > >2010 612.8148356.2.5d5325f21j0XN8 > > > > That link is to the true servo line they make, and which I have no > > experience with. What I do have experience with is their line of 3 > > phase steppers that think they are servo's. They are servo's > > internally but take the usual step/dir signals. 1000 ppr encoders on > > the motors. > > > > I just a month ago, got tired of vibrating tools off onto the > > concrete floor, and replaced the src of that vibration, a 1600oz/in > > nema 34 motor driving the Z on my Sheldon lathe conversion, used > > because I had it at the time, with the 3NM version of their > > stepper/servo. I doubled the movement speed, and silenced the > > vibration. Plenty of torque to drive it under cutting loads, but > > when I was done, I positioned a chuck jaw where it would hit it, and > > drove it toward the chuck and let it hit it at about 2" a minute. > > About 5 milliseconds after the chip hit the chuck jaw, it tripped, > > powering down the motors and unhomed the machine. > > > > Powering down the motors made it spring back from contact by around > > 5 thou, and it did it without visible damage to the stationary > > chuck, or to the carbide chip in the tool. So that looked like a > > better thing and I ordered, and rx'd yesterday, 2 of the 2NM > > versions of that motor, which is short enough to fit the X motor > > position. Now I have to figure out how to get those plugs past the > > carriage to-from the front apron. And probably splice both cables, > > its a long ways from the front apron to where the driver will live > > on the post in back of the spindle. > > > > > These look like the ones I use on my Skyfire Mill. The only > > > problem I've had is over driving my x axis into the side of steel > > > case and breaking it off the table. Not the motors fault the > > > other two are still working 3 years later. I replaced with the > > > original. > > > > > > > What do you think? The price is more than good. The seller has > > > > good feedback on all the listings but sadly, no enough sales to > > > > be sure. > > > > > > > > I'm tempted to buy these to drive the router but I don't really > > > > know if they will be reliable enough. > > > > > > > > Thanks as always. > > > > > > > > Leonardo > > > > > > > > _______________________________________________ > > > > Emc-users mailing list > > > > [email protected] > > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > _______________________________________________ > > > Emc-users mailing list > > > [email protected] > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > Cheers, Gene Heskett > > -- > > "There are four boxes to be used in defense of liberty: > > soap, ballot, jury, and ammo. Please use in that order." > > -Ed Howdershelt (Author) > > If we desire respect for the law, we must first make the law > > respectable. - Louis D. Brandeis > > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > > > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
