Mark With a dial travel indicators set against some part of the moving member, the motion over any distance can be confirmed
O--|--O is the same as O--........................|--O where the dots are "empty distance". and O-- is an indicator. In example, move the "work head" to the left stop, back off the stop enough to place a travel indicator in place with about .200 compression. Mirror the set up on the Right side. Then command moves to and from these original positions. The travel indicators can be placed at any location along the table if "mapping" is desired. Move 0 O--|...............................................--O Move +42 O--............................................|--O Move 0 O--|................................................--O (Check the dial indicator reading, did it repeat the original position?) Move +21 (half way down the table) O--..............|................--O Reset Indicator 2 O--...................|--O Move 0 O--|...................--O Move +21 O--.................|--O (did the move repeat as shown by the indicator?) Repeat ad nauseum I have done such on a drilling machine (position only) when the operator complained that "this machine just won't move as commanded". Hope it helps Cal ----- Original Message ----- From: "Mark Wendt (Contractor)" <mark.we...@nrl.navy.mil> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> Sent: Thursday, March 25, 2010 10:36 Subject: Re: [Emc-users] Jogging inaccuracies > Cal, > > 'Splain that one to me. I'm having trouble getting my mind > around that setup and how it will determine the accuracy of the run > down the x axis. I've never seen it done so I'm not sure how I'd set that > up. > > Mark > > At 10:25 AM 3/25/2010, you wrote: >>Put a lesser indicator at each end of the span. >> >>The distance between is moot. >> >> >>----- Original Message ----- >>From: "Mark Wendt (Contractor)" <mark.we...@nrl.navy.mil> >>To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> >>Sent: Thursday, March 25, 2010 10:20 >>Subject: Re: [Emc-users] Jogging inaccuracies >> >> >> > At 10:10 AM 3/25/2010, you wrote: >> >>You also need to take into account the form accuracy of the rack and >> >>its gear, this will give a cyclic error at tooth rate. >> >> >> >>The stepper will not give accurate amounts with microsteps, again its >> >>a cyclic error between steps specially if the torque as a percentage >> >>of what the stepper can do. >> >> >> >>Dave Caroline >> > >> > Sure wish I knew somebody with a 52" dial indicator... ;-) That's >> > the length of the run in the x axis. Be nice to see if this kinda >> > all averages out over the length of the run. >> > >> > Mark >> > >> > >> > >> ------------------------------------------------------------------------------ >> > 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 >> > Emc-users@lists.sourceforge.net >> > 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 >>Emc-users@lists.sourceforge.net >>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 > Emc-users@lists.sourceforge.net > 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
