2014-12-04 10:39 GMT-03:00 sam sokolik <sa...@empirescreen.com>: > Hmm - that looks like the Quick Turn 20 universal we just got. Has the > T2 control (1985). We are in the process of starting the conversion. > I had just assumed they where 'normal' resolvers.but had decided to swap > them out for encoders. We plan on using some AMC drives for the axis > and try to keep the VFD until it fails. (looks like at least one of the > original axis drives had been tampered with as they had been chasing a > problem with the x axis - new ball screw, new resolver...) >
Indeed, is a Quick Turn 20 but the control is a T1 instead of the T2 you have. I don't really know if there are big differences between them. Why are you planning to replace the original drives? Because Robert from this list had a machining center with the same drives as my Mazak (Meldas DC TR41A or TR31A I don't remember well). They are feeded by an analog voltage, possibly +/- 10 volts, so the only thing to keep would be the tachos on the motors to feed the drives. Then the resolvers or new encoders can close the position loop within LinuxCNC. I ask you this because I'm planning a retrofit too and I would like to keep the original servo drives, but may be your QT20 has different drives and you want to replace them. We replaced the spindle VFD a few months ago for a Yaskawa one because the original Fanuc wouldn't work anymore for some reason, and we suspect that it was a problem on the control board of the spindle drive wich is almost the same price of the entire Yaskawa drive. Here's a pic of the new drive installed: http://i.imgur.com/qhzzxmt.jpg The old fanuc demaned all the space you see there. This one is occupying 1/5 of the original drive. I guess your lathe has a similar cabinet and drive. -- *Leonardo Marsaglia*. ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
