This machine was built by the OEM with a 2 to 1 gear box on each axis. I believe you would have a hard time moving this much mass around without gear reduction (and not blowing up motors) at 300 IPM without them. Planetary gear boxes have very little backlash if any.
----- Original Message ----- From: "Jon Elson" <[email protected]> To: "Enhanced Machine Controller (EMC)" <[email protected]> Sent: Saturday, March 20, 2010 5:28 PM Subject: Re: [Emc-users] G52 and Fanuc conversion to EMC > Paul Keeton wrote: >> Gene, >> >> Do you (or anyone else) see any any issue with using a >> separate >> encoder and leaving the tach on the motor alone? > If you DO have a tach on the motor, then you are golden! >> I have seen this done on >> other servo systems with great reliability. Normally backlash is not an >> issue unless it is an excessive amount on those systems. You simply don't >> use backlash comp if there is a scale on the machine. You may have to if >> your encoder is on the screw. Almost definitely if your encoder is on the >> motor and you have a gear box. > The tach converter is only desired if there is NO tach present, it is > clearly a second choice. > Also, a gearbox on the motor is a terrible idea. Toothed belt reduction > works quite well and avoids the backlash problem. > Backlash compensation is also a bad idea, FAAAAR better to remove the > backlash as much as possible. > > Jon > > ------------------------------------------------------------------------------ > Download Intel® Parallel Studio Eval > Try the new software tools for yourself. Speed compiling, find bugs > proactively, and fine-tune applications for parallel performance. > See why Intel Parallel Studio got high marks during beta. > http://p.sf.net/sfu/intel-sw-dev > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
