RE: [CAD_CAM_EDM_DRO] EMC2 DC-servo controlled minimill

Thanks for the video's. I enjoyed them.
Are you able to use two mpg's with your setup. I would like to try the EMC, but I've been told the mpg doesnt work the way it should and there is only enough inputs for one generator... I would like the ability to use 2 mpgs to run my mill manually maybe even incorporate a total of three mpg's for x,y and z. And then have the ability to save my manual moves to create a teach mode/function. Now I'm asking to much ;-)
Hows the mpg work for you? One click =.001, or what ever the feed rate multiplier is set at? Can you crank it as fast as you want without loosing position or stalling? Does the axis follow without jerking?
Very nice mill!
Thanks!



To: CAD_CAM_EDM_DRO@yahoogroups.comFrom: anders.wallin@...: Sun, 11 May 2008 14:44:54 +0000Subject: [CAD_CAM_EDM_DRO] EMC2 DC-servo controlled minimill




Hi All,you may find some of my recent videos amusing/interesting.Servo tuning and test-runninghttp://video.google.com/videoplay?docid=3321458111477478272&hl=enTesting the X-axis:http://video.google.com/videoplay?docid=1864749796574452730&hl=enProgram dry-run:http://video.google.com/videoplay?docid=-4918805093165248240&hl=enOne of the first cuts:http://video.google.com/videoplay?docid=-6222166294337898920&hl=enFirst 'serious' job, rough and finish cutting a model-yacht keel bulbout of steel:http://video.google.com/videoplay?docid=916833244018390029&hl=enThe machine started out life as an Opti BF-20 manual mill, but onlythe base and column remain. We've installed linear rails, ballscrews,a new belt-driven spindle, a new bigger table, and an enclosure tokeep the coolant inside.It's controlled by EMC2 via an m5i20 pci-card from mesanet. Theservo-amps are from Jon Elson / Pico-systems and the DC-servos fromDan Mauch / camtronics.The servos have 1000 count encoders so I get 4000 edges per revolutionand they are direct-coupled to 2.5mm/rev ballscrews. I did thePID-tuning with rapids set to 4000mm/min and acceleration around500mm/s and it stays inside +/- 16 counts or around 0.01 mm at alltimes. Better than this for actual cutting which we do at around1500mm/min maximum.Next we are going to put an encoder on the spindle to enable rigidtapping.More about this in my blog: http://www.anderswallin.net/have fun,Anders







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