On Wed, 2008-07-02 at 16:37 -0500, Chris Radek wrote: > On Wed, Jul 02, 2008 at 02:12:17PM -0700, Kirk Wallace wrote: > > I did my first rigid tap on my lathe. It worked well the first time. > > (Thank you, developers) There is one minor problem. There seems to be a > > burr left behind about 1.3mm (.050") into the 4-40UNC hole. I shifted Z > > in my g-code to see if it would move , and it didn't, so I think it is > > independent of EMC2. I have to run a tap through by hand to clear it, so > > I suppose if I run g33.1 twice, that should fix it. I would rather not > > do that, so has anyone had this problem and fixed it? Thanks. > > What kind of tap are you using? Can you take a picture of the > problem? > > By shifting Z do you mean you tried starting the G33.1 higher 'above' > the hole?
Sorry for not being clear. I started the g33.1 farther away from the hole, thinking that if the fault where because of a motion or the tap the fault would move the distance of the new starting point, but the burr stays near the opening of the hole. I tried running g33.1 twice (..., g0 x0.0 z-1.0, g33.1 z-1.4 k0.025, g33.1 z-1.4 k0.025, g28) and this cleared the problem. I think slivers are following the tap as it retracts the first time, and are left in the threads as the tapered part of the tap leave the hole. When, I thread a screw in, the slivers bind and anchor, instead of getting swept out. With the double g33.1, the beginning threads seem to be slightly looser (my imagination maybe), so I ended up clearing the threads by hand while the next part runs. If I can figure it out, I should have a youtube of the part being made soon. -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC/EMC CNC lathe, Bridgeport mill conversion, doing XY now, Zubal lathe conversion pending Craftsman AA 109 restoration Shizuoka ST-N/EMC CNC) ------------------------------------------------------------------------- Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
