Jon Good to see your upgrade on a Bridgeport, you must have learned a lot while doing it. I have used these Proto Trak gage wheel type encoders in the shop. They have wipers and they work surprisingly well. I do not want to include them on an upgrade though. I would be curious if I could replace them with linear scales and integrate them into an upgrade instead of rotary encoders. I would think that it would be more accurate due to direct feedback of actual table position. I have heard that other companies have used them such a Anilam. Probably would be too complex for me right now. I took the cover off the x servo motor. It has what looks like a small motor in there like you suggested. Must be a tach. Thanks, Terry
Terry Neilson wrote: > > This has "gage wheel" type encoders that use a friction wheel that run > along > > > Ugh, these may not be terribly reliable. Position can drift with many > back and forth moves, and chips > could get under the wheel and shift the position. > > I am not sure if the amps are velocity > > mode and take +-10v, how can I find out? The amps say Glentek on them. > The > > schematic shows the motors as tach motors. > If there is what looks like a tiny motor on the back end of the motor, > with a pair of small wires that go > to the servo amp, that is the tach connection. > > I needed tachs but didn't have them in my motor. I added a tach driven > by a tiny instrument belt off the ballscrew. > I put an encoder on the end of the ballscrew with a helical-slit coupling. > You can see some photos here : > http://jelinux.pico-systems.com/CNCconv.html > Please excuse the awful pictures, I ought to redo them. > > Jon > > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by Sprint > What will you do first with EVO, the first 4G phone? > Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ This SF.net email is sponsored by Sprint What will you do first with EVO, the first 4G phone? Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
