On Wed, Oct 15, 2008 at 03:13:53AM +0000, acondit wrote: > I am trying to wrap my head around lathe tool offsets. > > Say I have a reference tool with both X and Y offsets of zero. > > Now I have a threading tool and it sticks out 0.252" farther in the X > direction > than the reference tool. Is that a 0.252 positive X offset?
No, it's -0.252 if you mean it sticks out toward +x > It sticks out 0.176" farther towards the spindle nose than the reference tool. > Is that also a positive Z offset? Yes it is positive since it points toward -z > What if I have a smaller tool can I use a negative offset for Z and/or X > offsets? > Yes you can use positive and negative numbers. > If I back off my toolpost to change tools (part of the gcode) and follow the > tool change code with a G43, will my tool move into the proper position when I > make the next move if all my moves are setup based on the reference tool? In > particular, if I put on a cutoff tool, an move a cut off position based on the > front corner of my reference tool (and have my tool offsets for the cutoff > tool > set correctly) will my cutoff tool be in the correct position for parting off? Yes. You'd want to issue two moves to get there G0 X[radius plus a little bit] G0 Z[-desired part length] then part, something like this: G96 D2000 S50 M3 (constant surface speed 50 SFM, up to max RPM 2000) G1 X0 G95 F.001 (part with 0.001 inch feed per revolution) **note** for CSS to work, your reference tool's tip must be at the spindle centerline when machine coordinate X is zero (G0 G53 X0) Chris ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
