[EMAIL PROTECTED] wrote: > but... sticking an encoder on an axis is not measuring the position of > anything except the leadscrew, it takes no account whatsoever of backlash, > uneven wear or pitch errors. > > To a certain extent you can map out backlash and areas of wear on a > leadscrew, but leadscrew pitch errors are going to be tough. > You can "map" backlash, but you can't FIX it in software. Backlash means the table position is NOT fully constrained. EMC2 already has the capability to fix pitch irregularity, you just need to do the tedious measurement with gage blocks once and enter the data.
> 5 times a second is *plenty* for an accurate positional measurement system > to update an accurate movement system, and produce a system with true > accuracy. > Not when the machine is moving at 60 IPM, doing a climb-mill cut. Jon ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
