We know one of the drives is marginal (and smells bad).. We have a lot of experience and have a bunch of amc drives on hand..
We would love to use the resolvers but then we would still need encoder inputs for the spindle. We made an executive decision to switch to encoders. We have some 5000 line differential thru-hole would only require a small adapter.. sam On 12/4/2014 8:27 AM, Leonardo Marsaglia wrote: > 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. > > > > > > > > > > > ------------------------------------------------------------------------------ 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
