Hi Kirk, On 6 Jul 2008 at 17:57, Kirk Wallace wrote:
> I was using a triangular insert with a front angle of 89 degrees > (almost parallel with the workpiece face) and a back angle of 29 > degrees (29 degrees from the OD surface). The insert has a chip > breaking groove approximately .030" wide. It worked fine in aluminum. The edge must be sharp, like it will shave the hairs from your arm sharp and a new edge... > > I take two roughing passes (~.080" each cut, violet lines), starting > from the left on the first pass and finishing the second pass on the > left. I then lead in (gray line) on the left and follow the finish > profile (blue). I'm with Les here .160" cut is nothing on delrin unless you have a thin wall. > > I got a torn melted finish. Is it reasonable to use one tool for all > directions; facing right and left, turning in and out? The more I > think about it, I think the insert isn't sharp enough. I may dress it > on my diamond wheel and see if it works any better. Melting is too high SFM or dull either one makes heat and heat melts. I would guess dull edge. > > I like the DCGT inserts, but I am having a little trouble finding a > holder (3/8" square shank) that will work on my Hardinge HNC. Youtube > seems to have the best picture of the turret: You can always get 1/2" shank tooling and machine the shank to fit your turrent. John ------------------------------------------------------------------------- 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
