Jon Elson wrote: > Roger Swift wrote: >> Jon, >> The mill is larger than a Bridgeport. Its a 7,000# Tree Journeyman 300 with a >> 12X26X6 envelope and a 500# part capacity. The motors, reduction (about >> 2.5:1), >> ball screws and encoder counts were not changed in the conversion to Mach3. >> The >> original amps, servo dynamics, were rated for 20 amps continuous and 45 amps >> surge. The machine works OK with Gecko's but is dreadfully slow. Mach3 has an >> excellent CV algorithm that almost entirely eliminates corner rounding even >> for >> slow axis and acceleration. >> >> > OK, so your problem is not acceleration but speed. Let's do some simple > arithmetic to see what is going on. > Assuming a 5 TPI ballscrew and 2.5:1 reduction, then you would need 1250 > motor RPM for each 100 IPM of movement. > What speeds are you being limited to? You might be limited by the step > pulse rate your computer can produce, not the motor/drive/power supply > combination. What is the volt/RPM rating of the motors?
Here's some more arithmetic - 80V maximum rated voltage of the Geckos divided by nominal 160V rating of the motors means they'll be limited to at best 1/2 of the design speed. Probably worse than that - I bet Roger isn't running exactly 80V into the Geckos. 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
