aaron Moore wrote: > Opps > Sorry mm > 5mm per second on a 1.5m x 1.5m gantry style router. Is this not reasonable? > Aaron >
You tell me - it is your machine... A top speed of 5mm/second means it will take 300 seconds (5 minutes) to travel the width or length of your 1500mm table. That seems pretty bad. If this is a homemade machine with cheap or free steppers from old printers, that may be the best it can do, and that is fine. If it is an expensive commercial machine, it better be able to go faster. An accel number of 1mm/sec per second still means it will take 5 seconds to reach top speed. That seems like a long time for any machine that has properly sized motors. The reason stepconf asks you questions about your machine is because only YOU know your machine. Do you have a very light, low friction machine with powerful motors and drives? Or do you have a huge and heavy machine with tiny, underpowered motors that can barely move it? Or do you have something in-between - where the motors are "just right" for the size and weight of the machine? The machine might have great motors, but if you tell stepconf "this machine can only move at a crawl, and it takes all day to get up to speed", then that is exactly what you are going to get - a machine that moves at a crawl and either rounds off corners or has to come to a near stop every time it goes around a corner. (G64 lets you choose which.) On the other hand, if your machine has tiny motors but you tell EMC that it can go from zero to zoom in a fraction of a second, EMC will ask the motors to do exactly that, and you will have stalling and lost steps. I apologize if it sounds like I am ranting. But you can't get around the fact that CNC machine design is _engineering_, and engineering requires both math and the ability to understand what the numbers mean. A properly engineered machine will have motors that are well matched to the load, and if software stepping was planned, it will have a scale factor that matches the range of frequencies that PCs can generate. IF the machine is properly engineered, and if you give good answers to stepconf's questions, it will do the configuration math for you and give you a reasonable configuration. Right now we don't know enough about your machine to know if the problem is a poorly designed machine (motors to small, too many micro-steps, etc) or if you simply aren't giving stepconf the right data. We need more information if we are going to help you. Regards, John Kasunich ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
