On 6 August 2018 at 03:36, Gene Heskett <[email protected]> wrote:
> Tool paths (corrected) are I assume to be the nearest of the 8 positions, > or are those actually calculated from data in the tool table (and fussed > about if obviously wrong I hope. Tool radius correction is based entirely on the stated tool orientation in the tool table. It take no account of the stated front and back angles. If you want an orientation 2 tool with the cutter flanks pointing back in to the work then Axis will cheerfully render that for you while at the same time the motion planner will do radius compensation for an orientation 2 tool. The tool controlled point can only be at 9 positions relative to the centre point of the tool tip radius. This has very little to do with the flank angles. It is more related to which quadrants of a notional full-circle tool are in use. For example orienation 2 (right hand facing and turning) expects to be touching at 12-o-clock when moving purely in Z and at 9-o-clock when facing in X. If moving in some combination then the tool will be moved a little bit closer to the work to compensate for the gap between the controlled point and the tool tip that exists between those two tangents. For the vast majority of lathe work cutter comp is not important. The positions of shoulders and absolute diameters are unaffected. Tapers will end up a little fatter than drawn and both external and internal fillets will have extra material. The latter vary rarely matters, and the former normally seem to need some tweaking-to-fit anyway, so I run with cutter-comp turned off nearly all the time. If I was machining accurate spheres then things would be different. -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1916 ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
