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=2114.12010 > >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 > > 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 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
