On Wed, 2010-09-08 at 13:07 -0500, Igor Chudov wrote: > - Igor > > > > On Wed, Sep 8, 2010 at 12:57 PM, Jon Elson <el...@pico-systems.com> wrote: > > Igor Chudov wrote: > >> Thanks to all for some clarifications that encouraged me to take some > >> ginger first steps towards this (read, bought a servo motor on ebay). > >> > >> Guys, do you think that this servo motor will "do" to motorize the > >> knee of my Bridgeport Interact: > >> > >> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=390233108125 > >> > >> This is an "Italiano servomotori", with a 15:1 gearbox and a tach. I > >> think that it can give me about 7 ft-lbs of torque on its chain drive > >> at 200 RPM. That should be enough to move the knee with air assist. > >> With 1:1 transmission, it would amount to 40 IPM, probably a bit less > >> in real life. > >> > > Is this just a power elevator or a real servo axis? If servo, what will > > you use to measure > > W position? Probably not good to put an encoder on the motor, between > > the worm gear on the motor, > > the bevel gear in the knee and the Acme screw, the backlash will be large. > > Jon, good question. > > I think that the heavy knee will always sit tight on the acme screw. > > Other backlash may be at least repeatable. I will see. I am not > totally averse to just putting an encoder on the knee handle shaft. > > i > > > Jon I have a glass scale on my W (acme screw). It is stable to about 1 or two tenths on the upstroke. I try to overshoot and come back when lowering it.
Dave > > ------------------------------------------------------------------------------ > > This SF.net Dev2Dev email is sponsored by: > > > > Show off your parallel programming skills. > > Enter the Intel(R) Threading Challenge 2010. > > http://p.sf.net/sfu/intel-thread-sfd > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > ------------------------------------------------------------------------------ > This SF.net Dev2Dev email is sponsored by: > > Show off your parallel programming skills. > Enter the Intel(R) Threading Challenge 2010. > http://p.sf.net/sfu/intel-thread-sfd > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ This SF.net Dev2Dev email is sponsored by: Show off your parallel programming skills. Enter the Intel(R) Threading Challenge 2010. http://p.sf.net/sfu/intel-thread-sfd _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
