> I _think_ (it's not entirely clear) that the machine in question doesn't > have screws at all - either the carriage is clamped to a belt that runs > between pulleys at the extremes of travel, or the belt is clamped at > both ends and runs over a pulley on the carriage. Either way, the belt > is quite long, and it doesn't benefit from the mechanical advantage of a > screw. This is completely different than the traditional "belt and two > pulleys" used to couple a motor to a screw. Using a long belt to > replace a screw is significantly less rigid, but can be much faster and > less expensive. It is usually done on large, fast, but non-precise > machines like wood routers or plasma cutters.
I saw a link from fenn on IRC the other day, it shows an interesting concept, using 2 belts. http://www.designnews.com/article/160365-A_Better_Belt_Drive.php?nid=2337&rid=1696394 This probably works ok even for longer distances, as the actual belt distance is kept very short.. Regards, Alex ------------------------------------------------------------------------------ Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) software. With Adobe AIR, Ajax developers can use existing skills and code to build responsive, highly engaging applications that combine the power of local resources and data with the reach of the web. Download the Adobe AIR SDK and Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
