On 8/10/2011 9:39 PM, andy pugh wrote: > ot that I have ever used one. Step-Direction servo drives are a > kludge mainly aimed at the Mach3 market as an easy upgrade to > steppers. >
Many commercial servo drives now offer a step and direction interface as it is easy to use that to control a servo drive via a PLC. The Gecko drives close the loop internally inside the drive just as the industrial servo drives do (although most industrial drives are much more sophiticated.) If you want to go with new brushless servo motors and drives, the TECO drives and motors from Machmotion are a bargain IMO. They are very similar to the Automation Direct Brushless servo drives but much cheaper. http://machmotion.com/cnc-products/drives-motors/teco-servo-drives-and-motors.html?SID=c9618861b7239d4c9f615fff286ed361 I installed the TECO 1 KW, 2000 rpm motors and drives on two machines last year. One machine is packaging machine and it is running over 16 hours a days right now, cycling at least 20 times per minute. Two of the drives reverse direction through the machine cycle - servo hell! It has been running a minimum of one shift per day for about a year right now and they have not had any drive or motor failures, but they have replaced the gearboxes on the machine twice in the past year. The Teco drives have both a step and direction interface and an analog interface built in. They can also operate in torque or velocity mode when used as an analog controlled drive. Dave ------------------------------------------------------------------------------ Get a FREE DOWNLOAD! and learn more about uberSVN rich system, user administration capabilities and model configuration. Take the hassle out of deploying and managing Subversion and the tools developers use with it. http://p.sf.net/sfu/wandisco-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
