Igor Chudov wrote: > My encoders have 1024 counts, or 4096 pulses per revolution. One > revolution is 2.5mm table motion. This means that one pulse is .000024 > inch or 0.00061 mm per count. It is a little hard to figure out how > miscalculations of speed from discrete pulse counts affect > positioning, but it may be acceptable enough for what I do. At a speed > of 0.1 IPM, for example, the encoder will see 68 pulses per second. I > would be surprised to need to move at a slower rate. > Well, when performing an arc move, each axis slows to absolutely zero speed and then reverses twice to complete the circle. So, it goes all the way down to zero counts/second for a moment before starting back up in the opposite direction. This is the acid test for a servo axis, can it handle the reversal completely smoothly? Of course, the definition of "completely smoothly" is subjective, how smooth is smooth enough?
Jon ------------------------------------------------------------------------------ Start uncovering the many advantages of virtual appliances and start using them to simplify application deployment and accelerate your shift to cloud computing. http://p.sf.net/sfu/novell-sfdev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
