Jim Coleman wrote: > > I recently purchased (actually still have to get the damn thing moved!) > an older Hitachi Seiki VM-40 VMC, which has some damage and the computer > is going senile as i like to put it. As you've probably already figured > out, this is where EMC is coming into the picture. I am planning on > replacing the control with a P4 2.6 rig, 1 gig ECC ram PC with a mesa > 5i20 card. I have seen discussion of using a filtered PWM signal to > drive a servo amp, and was wondering how accurate this would be, and if > it was a viable option to buying a servo amp interface. If not that, > could a DAC be used? I'm still cloudy on how the servo amp works with > the signaling and stuff, but trying to learn none the less. The servos > are Sanyo Denki BL Super, 1.3 kw for x and y and 2.8 for Z, First, you need to find out what the old controller sent to the servo amps to control them. If it is +/- 10 V velocity commands, then it would be best to drve that with a real DAC. spindle is a > mitsubishi freqrol VFD on a 7.5 hp 6000 rpm motor. Again, you need to check out what the control sent to the VFD to control speed, but likely 0 to +10 V for 0 to max speed. after I get those > working, I'd like to get the tool changer fixed, one of the problems > with the machine, the Y axis either encoder or amp malfunctioned, and > ran the spindle into the tool changer arm and bent it up. and I need to > figure out if its the encoder or amp, but I should be able to hook the > encoder's a and b to a parallel port and find out right? and use the > parport to hook up the handle, its a 100 count encoder in a little box > with XYZ 1 10 100 buttons. > it might be time to buy a second-hand oscilloscope on eBay. > I plan on starting individual threads when I get things together (money > for a mesa card, getting the machine moved...) and run into problems. > really looking forward to using emc, and glad I found it before I went > with mach. You probably could not run this machine in the intended servo mode with Mach.
Jon ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
