On 02/03/2017 01:59 AM, Valerio Bellizzomi wrote: > http://www.infodelta.it/foto/film/filettatura%20interpolata.mp4 > > This is thread milling. You use a cutter that looks sort of like a tap, but the rows of teeth are actually rings, not a helix. You place the tool into a hole that is large enough for it to pass straight through, and then move toward the side and preform a helical move. Generally, you plunge straight to the bottom of the hole and then make the helix back out in Z, this climb mills the thread. You make slightly more than one turn of the helical move, and the entire hole is threaded.
Pretty much all modern CNC controls can do helical interpolation. thread mills are expensive tools, and can only do one thread pitch, although they can be used for a range of thread diameters. There is an alternative, a single row thread mill. This can do a wide range of thread pitches, but as it only has one row of teeth, you need to make the helix follow the entire number of turns of the thread. But, for special threads where you don't have either a conventional tap or a thread mill, and can't fit the part in a lathe, it can make it possible to put the thread in. Jon ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
