On 13 June 2013 14:47, Kirk Wallace <kwall...@wallacecompany.com> wrote:
> Depending on the thread pitch, there are one or two threads per > leadscrew revolution. ... > The ELS takes the place of the spindle to leadscrew and indicator gearing. My point is that the indicator measures the carriage position (modulo several threads) but an ELS does not know this position. (If the machine has linear scales, then the problem I am describing does not exist). And there are many thread pitches where you can't use a threading indicator anyway (cross-standard threads with the 127 tooth gear, for example) I worked out all the change-gear settings for my Chinese lathe (before I thought of doing CNC). There are actually several changewheel combinations per pitch, but on that lathe 1.2mm pitch couldn't be disenaged. The summary table is on sheet 3 here, the workings on the other sheets: https://docs.google.com/spreadsheet/ccc?key=0AhjJW1-T6n7CdFFSbTQwTjFmWlg3ZXVtUnNxSHo0dlE&usp=sharing -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ This SF.net email is sponsored by Windows: Build for Windows Store. http://p.sf.net/sfu/windows-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
