First of all, thank you developers for EMC and thank you John Kasunich for getting the m5i20 threading working. I loaded the pre 2.1.7 version and built it on my pc, the threading worked first try, I only had to change my old latch-index to index-enable and then tested it out, I now have a lathe pawn with threads!
In wondering about setting up to cut threads, I thought perhaps I could set my threading tool as if it came to a shap 0 radius point and thread the full depth from that imaginary point. I drew a 60 degree point in AutoCad, drew a line through the point, then applied different radius' to the point. For a .008" radius cutting tool, there was .008" between the tool tip and the line representing point, for a .0156" radius, there was .0156" between the tool tip and "point", and so on. The tool tip radius equaled the gap between the peak of the radius and the 0 radius point. So, I was wondering if I used a threading tool with a .008" radius, could I take a light test cut, measure the radius, add .008" set that as the X position of that tool, then thread to the full thread depth. This would put the imaginary 0" radius point at the full thread depth and actual point .008" out from the full thread depth. This procedure could be adapted for whatever tool tip radius you were using. If a test cut wasn't practical, you could use feeler gages to set the tool, as long as you knew the tool tip radius. Or perhaps there is an easier way I'm overlooking :-) I plan to try this out, perhaps I could learn how to measure with the 3 wire method and see how close the threads came out. My goal is to come up with a method that will give me the right thread depth with minimal trial and error. I have a project of machining a back plate for an L&W dividing head, the thread is 2-1/4 10tpi. I dread test fitting the dividing head to the back plate! Roger Neal ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
