I did my first CNC lathe thread today. I actually got a thread which, on a first try, I didn't expect. I entered parameters for a 20 tpi thread and got something like 23 tpi. When I setup the spindle parameters in the ini file, I assumed that the encoder input scale should equal the number of pulses per revolution (1250 cpr x 4 p/cpr = 5000 ppr).
--- hnc-3a.ini --- ... [SPINDLE] # Encoder INPUT_SCALE = 5000 OUTPUT_SCALE = 1 # DAC output to VFD DAC_SCALE = 320 ... --- My thinking is that INPUT_SCALE should not need to be adjusted by cut and try, so if the thread tpi is not correct, it must be an encoder problem? Maybe missing pulses or noise adding pulses? Thanks for any replies. (config files here: http://www.wallacecompany.com/cnc_lathe/HNC/emc2/ http://www.wallacecompany.com/machine_shop/ ) Kirk Wallace (Hardinge HNC lathe, California, USA) ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
