On Tuesday 20 October 2020 04:05:59 John Dammeyer wrote: > Hi Marcus, > > > -----Original Message----- > > From: marcus.bow...@visible.eclipse.co.uk > > [mailto:marcus.bow...@visible.eclipse.co.uk] Sent: October-20-20 > > 12:02 AM > > To: Enhanced Machine Controller (EMC) > > Subject: Re: [Emc-users] driver for a DC motor for a BS-1. > > > > On 2020-10-19 23:30, John Dammeyer wrote: > > > I haven't looked into what's available from China other than the > > > Bergerda AC Servos I'm using as a mill spindle and will be using > > > as the South Bend Lathe Lead screw upgrade. > > > > Can you tell me the model of servo, please. And explain the control > > device? > > That would help me move forward two ongoing projects (one for a > > converted 1500W/2HP mill which has been running LinuxCNC for the > > last 16 years with manual control of spindle speed, and another for > > a 750W/1HP lathe I am upgrading from a proprietary CNC control > > system to LinuxCNC, renewing the obsolete electronics and the motors > > at the same time). Thanks. (It's another excuse to postpone work for > > a few minutes...) > > > > Marcus > > I'm totally enamoured with LinuxCNC controlled spindle speed. Can't > wait to finish building the spindle encoder part so I can try power > tapping. > > I'm still amazed at the difference in size. This is the original > motor, 2HP (1.5kW), 220VAC single phase, 1725 RPM. Required an > intermediate 4 step pulley and 4 step pulleys on spindle and motor. > And pretty loud. http://www.autoartisans.com/mill/MillDriveSection.jpg > > This is the replacement AC Servo. 110SM-M0630MAL with companion > drive. 1.8KW, 3000 RPM, 6Nm rated torque, 18Nm peak torque, Peak > Current 18A and 2500 line encoder. Runs very quietly. > http://www.autoartisans.com/mill/NewPulleys-1.jpg > > I could barely lift the 2HP motor off the top. This one is quite > light. Now to be honest I haven't used it at anywhere near full power > but I did do some engraving at 3000 RPM. I'm using PWM from the MESA > 7i92H and a far east PWM to 0-10V module. With PWM, 100RPM to 3000 > RPM. Can't do much less because the PWM module can't do it. > It probably can if using the "pdm" mode where it goes into skip a pulse mode for the slower stuff.
> I do plan on changing to step/dir control with a separate enable so I > can turn the spindle by hand. > > I had some issues with it decelerating really fast and then vibrating > when stopped. If I tugged on the spindle I could get it to stop or > restart vibrating. A quick email request to Donald at Bergerda in > China and he talked to his engineers. Came back with some parameter > changes and the issues went away. We also worked out better values > for decelerating a bit more slowly. > > Here's the motor sheet > http://en.bergerda.com/product/608.html > > And the drives with a table to match to the motor. > http://en.bergerda.com/product/609.html > > Overall I found both the big one and a smaller 400W motor easy to work > with. Still not entirely happy with the RS485 link. When the motor > is disabled I had no trouble using their PC program for configuring > it. With the motor enabled the electrical noise was enough to damage > messages. > > But the truth is after the initial playing around I use the front > panel and buttons and the user manual to set/save parameters. It's > pretty easy and fast once you understand some of their terms for > things. > > And Donald Chen has been very helpful. I do plan on buying some more > to replace the stepper on the Lathe Z axis and the knee stepper motor > on the mill. Not sure how big a motor I'll need for the knee. > Currently a 1200oz-in stepper run with a Gecko and 65VDC power supply. > Max I get on knee going up is 25 ipm and that's pushing it. > > John > > > _______________________________________________ > > 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
