On Tue, 2007-06-19 at 16:46 -0700, Kirk Wallace wrote: > It would be > nice to have another for the three phase coolant pump VFD too.
That's what Ray & I did, although I had planned to control the VFD over its Modbus interface. Last year at the CNC Workshop I adapted some software I found on the Internet to control one of these drives that Ray brought to the show. I've never integrated it into the EMC though. It should probably be a HAL module, although I don't think speed commands really need to be handled in real time. Like Jon said, variable speed coolant! M7P11.5 maybe? I don't know... > 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. That is actually what Ray & I ended up doing. I did have built, replicas of the resolvers. They had the identical "shaft end", but the body was shortened and the rear face was machined to accept US Digital kit encoders. Ultimately, these didn't get used because the body of the encoder stuck out too far (perpendicular to the axis of the fake encoder body) no matter which way they were rotated. So, the existing planetary gearbox was removed leaving only the aluminum ring that supported it which was drilled & tapped to fit the USD kit encoders. Small shaft extensions (I think 3/8" OD x ID to match the protruding ball screw end) were turned up upon which new 3/8" ID encoder disks rotate. We are tachless in Baltimore... Yes, I have blueprints of this stuff. Yes, I'll also try to post pictures too.... Matt ------------------------------------------------------------------------- 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
