On Thu, 2010-11-18 at 14:49 +0200, Viesturs Lācis wrote: ... snip > 1) What is the point to have Z axis and also W axis in one machine?
My guess is for speed without loosing range. The Z is short but fast, the W long. > 2) Ok, there are ballscrews for Z and W axis. Where can I find some > more information about the hydraulic counter-balancing? What is it's > purpose and how it works? As Andy said, the hydraulics offset the weight of the W/Z so that the axis motors only drive the mass and cutting forces. Many bed CNC machines have a chain that goes over the top of the machine then attaches to a weight that equals the head weight, kind of like an elevator. The problem here is that you now have to move twice the mass. When I get around to finishing my Bridgeport mill, I plan on having a pair of pneumatic cylinders pushing up on the knee to take some of the load off the knee ball screw. > 3) Any ideas about the precision of this monster? A while back, I think there was a similar machine installed at Scaled Composites which had an accuracy of +/- .05mm (.002"). I'm a bit foggy on the specifics and there doesn't seem to be a link at their website any more. I believe this machine had linear motors on the X and Y. The DSG machine seems to be pretty traditional with rack and pinion for X, and ball screws for the rest. The W screws seem a little wimpy to me, I wonder if there are another set or two, on the back and sides? > 4) I am curious about the approximate number in the contract :)) > Article says multi-million... > > It seems to me that those guys can mill a car's bodywork from a single > piece of material. Those guys that have to make the clay models for > each new model would be happy to have this little friend and get a > chance for A LOT of poker games. Or whatever they prefer. > > /vie In the shop I worked for, we would debur and sand the machine marks off the parts between loading the CNC, or sweep the floor, or skim the oil off the bulk coolant tank, or load another machine, or cut blanks, or ... Every work minute and every piece of tooling and material was scheduled and tracked. I like my current boss better. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Beautiful is writing same markup. Internet Explorer 9 supports standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3. Spend less time writing and rewriting code and more time creating great experiences on the web. Be a part of the beta today http://p.sf.net/sfu/msIE9-sfdev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
