Thanks for the info guys. I'll try to install the latest version (I'm still at 2.2.0) and check to which speed/accell I can get the Z axis, but I'm afraid I won't get much higher (running 230 steppers on xylotex and sherline (1mm thread)).
Would you specialists recommend using the precompiled package or the CVS extract? Regards, Geert John Kasunich wrote: > Chris Radek wrote: >> On Mon, Oct 06, 2008 at 01:01:25PM +0200, Geert De Pecker wrote: >>> For the Z, velocity is 4 (guess 4mm/sec) and accelleration is 3. >> This means it takes 1.3 seconds to get to full speed and another 1.3 >> seconds to stop again. You probably cannot thread with such a low >> acceleration. >> >> After updating to 2.2.6 try making sure your acceleration is set as >> high as possible. >> > > To be precise, it means you cannot thread quickly, or cut coarse > threads. For the specific example you quoted, a 0.2mm thread pitch at > 120 RPM, the Z axis needs to move at 120 * 0.2 / 60 = 0.4 mm/sec. At > 3mm/sec^2 accel it will take 0.133 seconds to accelerate, and the > spindle will turn 0.267 revolutions in that time. That is fine. > > But 0.2mm is a very fine thread, and 120RPM is a very slow speed. > > A more realistic thread is M6 x 1.0. That is 6mm diameter by 1mm pitch. > For a modest cutting speed of 10m/min, you would like to be able to > set the spindle speed to 530 RPM. That would require a Z axis travel of > 530RPM * 1.0mm pitch = 530mm/min = 8.8mm/sec, which is more than twice > what your Z can do. At 3mm/sec^2, it would take almost three seconds > and 13mm to accelerate to that speed. > > Regards, > > John Kasunich > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's challenge > Build the coolest Linux based applications with Moblin SDK & win great prizes > Grand prize is a trip for two to an Open Source event anywhere in the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
