+0 -0 is an ok number for climb milling, which most CAM thinks it is ok to do for best finish, else you should program your paths for conventional milling where the play is taken up by the cutting force.
Dave Caroline On 07/04/2015, Karl Jacobs <karl.jac...@gmx.de> wrote: > just for correctness: 0.1mm is about 4 thou, not 2.5 ... > Cheers, > Karl > (a traveller between the metric and imperial parts of this planet) > > > Am 07.04.2015 um 07:01 schrieb dave: >> >> >> On 04/06/2015 12:29 PM, Gene Heskett wrote: >>> On Monday 06 April 2015 14:12:31 John Alexander Stewart wrote: >>>> Hi all; >>>> >>>> Finally fixed the Oldham couplers for my X/Y axes on my latest build, >>>> and was measuring backlash for inserting in the LinuxCNC ini file. >>>> >>>> This is for a "G0704" style of mill conversion, using one of those >>>> kits from the old KeilingCNC place. >>>> >>>> X/Y/Z is 0.1mm, 0.24mm 0.1mm or, 2.5 thou, 9 thou, 2.5 thou. >>> The 2.5 thou is a bit loose, bigger balls in the nut perhaps? >>> >>> The 9 thou Y indicates either the thrust bearing at the solidly anchored >>> end of the screw is duff, or perhaps not properly assembled. I was able >>> to fix one of those in a cheap 16mmx5 Chinese screw on my toy lathes z >>> by padding the outer ring separation with some half thou alu foil shims. >>> Several of them stacked. Tricky to cut too. Seems to be holding up so >>> far. >>> >>>> Is this considered "ok" or "out of range"? >>>> >>>> I've put these figures in my mill ini file, and it's currently running >>>> the X and Y axes back and forth; will measure it again after a bit of >>>> wearing in. >>>> >>>> Any thoughts/comments? >>>> >>>> (as an aside, Andy Pugh's feedback for spindle soft-gearing works a >>>> treat - thank you again Andy) >>>> >>>> John. >>> Let us know what you found John, it helps the next person with a similar >>> problem. >>> >>> Cheers, Gene Heskett >> I've been dealing with a loose Y axis on my cinci contourmaster; this >> machine >> is set up so one can turn either the ballscrew or the servo motor to >> adjust >> position. The so-called lock on the servo end was loose and so the >> backlash >> was self-adjusting;out to unusable amounts. Ugh. I'm in the process of >> a dual fix ... complete rebuild the mount for the ballscrew so I can >> lock it down tight.... and add a 10" 5 um glass scale for reference. >> For now I will connect just the glass scale with it's attendant tuning >> problems (just not quite enough counts) but the future holds a config >> where P and D are fed from a 40K count/in encoderon the ballscrew and I >> is driven by the glass scale in like manner to Stu's big machine. >> >> Some years ago I was asked to fab a bunch of blocks for a US First >> robotics team. Set them up and ran as a batch. >> When finished I miked them to see how I'd done. SD was 0.001 but the >> dimensions were all large by about 2 thou. This on a machine (mazak) >> with 0.0025 backlash on both X and Y. Appropriate cutter comp might have >> landed these in the right range if it made a difference. ;-) Just >> personal experience. >> >> Dave >> >> ------------------------------------------------------------------------------ >> BPM Camp - Free Virtual Workshop May 6th at 10am PDT/1PM EDT >> Develop your own process in accordance with the BPMN 2 standard >> Learn Process modeling best practices with Bonita BPM through live >> exercises >> http://www.bonitasoft.com/be-part-of-it/events/bpm-camp-virtual- >> event?utm_ >> source=Sourceforge_BPM_Camp_5_6_15&utm_medium=email&utm_campaign=VA_SF >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > > ------------------------------------------------------------------------------ > BPM Camp - Free Virtual Workshop May 6th at 10am PDT/1PM EDT > Develop your own process in accordance with the BPMN 2 standard > Learn Process modeling best practices with Bonita BPM through live > exercises > http://www.bonitasoft.com/be-part-of-it/events/bpm-camp-virtual- event?utm_ > source=Sourceforge_BPM_Camp_5_6_15&utm_medium=email&utm_campaign=VA_SF > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ BPM Camp - Free Virtual Workshop May 6th at 10am PDT/1PM EDT Develop your own process in accordance with the BPMN 2 standard Learn Process modeling best practices with Bonita BPM through live exercises http://www.bonitasoft.com/be-part-of-it/events/bpm-camp-virtual- event?utm_ source=Sourceforge_BPM_Camp_5_6_15&utm_medium=email&utm_campaign=VA_SF _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
