Hi Kirk
On Tue, 19 Jun 2007 11:46:35 -0500, "Enhanced Machine Controller (EMC)" <[email protected]> said: >Kirk Wallace wrote: >> Hello all, >> >> I have a Hardinge HNC which I am thinking about converting to EMC. It >> was working very well for the previous owner, so I am concerned about >> making sure that if I make the conversion, that it works just as well or >> better, in order to justify the conversion. Does anyone have any >> experience with EMC with the HNC that they would like to share? Should I >> consider using the existing resolvers as opposed to replacing with >> encoders? >You want to talk with Ray Henry, as he and Matt Shaver did one >of these machines, but he changed the resolvers to encoders, and >found it to be pretty easy. The resolvers are servo flange >mount, so just get an encoder with the same mounting flange, and >your are set. If the encoder doesn't have the same shaft size, >then you will need to change the shaft coupling or adapt with a >ring. Matt has a design for a little spindle the shape and size of the old resolvers. We put inexpensive us digital encoders on the back of these. That meant that we didn't have to do much adapting. The feedback package on these machines and the CHNC are pretty tricky to handle. You can't adapt any other feedback to the motor on X because there is no room. > The PLC feature of EMC should be able to handle the turret, >> the two speed spindle, collet closer, bar feed, parting attachment, >> coolant, and lube system. I am planning to remove the variable pulley >> drive and use a VFD with the existing two speed clutch system instead. I >> believe the servo drives have +-10V analog input so Jon's PPMC would be >> appropriate? >You could use the PPMC if your servo amps are in good shape. >Ray and Matt used my PWM controller and my PWM servo amps, and >thought it performed well. I think that the PPMC is an awesome setup for this kind of retrofit. The drives and the interface/pwm generator cards are very professionally made. The motors are/were state of the art Electrocraft designed and are conservatevly rated about 600 watt and achieve full speed at 90 volts. I found that during accel they can be pushed quite a but harder than you'd expect for a sub hp motor. > Apparently, the turret position feedback is a three bit >> binary value, so I will need a binary data input somewhere. Anything >> else I need to consider? > >If you can get the hal files from Ray or Matt, it will speed you >on your way. I think Ray spent a lot of time getting the tool >change to work right. Because of the number of I/Os needed to >control the turret and the rest of the machine, he used an >additional I/O card to the PWM controller. I think they are >made in England, I can't remember the maker. I seem to remember donating a winford engineering card to the project but that was a while back. If so it was a 24 dio card. The idea was to include some stuff like collet close using hardware switches. This retrofit was pre emc2. I wrote the tool changer using tkio. It could easily be handled in HAL. One trick is the tuning on the air motor that spins the turret. You have to get the speed matched to a delay in EMC in order to get it to sit down properly at the end of a tool change. Hope this helps. Let us know your progress. Glad to help where I know anything useful. 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
