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. 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
