N.C., Some research I've done tells me that most people just set the varispeed head to ~3300 RPM and use the VFD for speed control, but I'm trying to go all out and have total control. They even run it to 5500 RPM, but I'm not sure I want to strain the spindle bearings that much.
Let me give you the generic warning about checking the lube metering valves to make sure they're not plugged. Mine has 4, and the ones for the table use the metered oil to spread through channels in the ways. I didn't verify that the channels are clear, but the metering valves are fairly easy to pull on the left side of the knee and column. Some people claim there are 31 of them, but this must be other versions of the machine. This is one resource for stepper wiring: http://www.cnczone.com/forums/bridgeport_hardinge_mills/146609-gecko_203v_bridgeport_stepper_wiring.html#post1061116 I'm told some factory steppers used 6 wire motors, but my schematics only show 8 wire motors. The discussion on that forum indicates it's desirable to run the motors in parallel. Apparently the factory drives supply 8 amps, so the geckos' 7A is sufficient. I chose to increase the voltage to (hopefully) give them a bit more torque, though obviously that won't help at low speeds. Of course, a google search will yield debates on parallel vs. series wiring for these motors. Moral of the story is that I'm not sure yet but the large number of testimonials for Geckos as being sufficient for the factory motors tells me it'll be fine. Apparently Larken drives can handle higher current, but they're also substantially more expensive per drive and I really don't need absolute maximum performance. Matt ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
