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
