Kirk
On Tue, 19 Jun 2007 16:46:42 -0700, "Enhanced Machine Controller (EMC)" <[email protected]> said: >Thanks for the replies Jon and Ray. Like Ray said, I was wrong about the >servo drivers, they have PWM inputs instead of the analog inputs, which >is even better. So it looks like the Universal PWM controller would be a >better fit, plus it has the DAC option for the spindle VFD. It would be >nice to have another for the three phase coolant pump VFD too. We were setting up the machine for 240 volt and did that also using the littlist automation direct controller. >I will >need more digital outputs. Another printer port may do the trick here? Sure. The ability to make that all input using HAL makes parports more valuable in EMC2. >Each axis and the spindle have a tachometer and a resolver. I am >planning to replace the resolvers with encoders, but is there any reason >to keep the tachometers? Removing both, plus the gearbox they are >mounted to, would free up space for a proper encoder, it seems. Certainly a possibility if you keep just the inner part of the feedback package. A shaft encoder could be mounted directly to it. I decided against doing that because of the cost of a proper shaft coupling and used the existing coupling. The full gear setup is nice for the added resolution. The accuracy of the machine as setup from the factory was awesome. A good operator could easily hold a couple tenths. If you do use the existing, I'd leave the tach to balance the little gears on the large one. But then that's just me. Rayh ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
