On Tuesday 12 February 2008, Brian Pitt wrote: >On Monday 11 February 2008 15:14, Gene Heskett wrote: >> On Monday 11 February 2008, Ian W. Wright wrote: >> >For those who were fascinated by the polygon turning have a look at this >> >- http://tinyurl.com/2wqbvl , it achieves the same ends but without any >> >extra power or synchronisation of spindle and cutter! The video even >> >gives a good indication of how you can make your own!!! >> >Usual disclaimer - no connection with company etc. etc. >> >> Now that's cute Ian. But the forces would seem to preclude my trying it >> on my little toy lathe. > >with the angular offset and shearing action of the cutter they take allot > less push than you'd think
But its a full splines depth of cut in one pass, just with the force concentrated on one tooth at a time. You could still be pushing thru an 1/8" or more of steel per spline depending on how deep they were. > but you have no controll of the orientation That could be a problem where one would need timing accuracy. That would be curable with cnc synch between spindles, but there isn't any in that setup. > and > you cant work behind a shoulder or swallow more than an inch or so of the > part >then again the polygon head wont do splines ,keyseats or internal work > >a few years ago someone made a CNC mill that would drill square holes like > this http://upper.us.edu/faculty/smith/reuleaux.htm >by syncing the table motion to the spindle position Neat, but would need way faster tables than I have. >I'm sure someone somewhere has a use for that feature but I think they did > it mainly to show off how fast the machine was ;) There is more than a little bit of the "watch this, see what I can do" available on the net these days, unforch a lot of it shot by folks with little knowledge of how to shoot such a project, so it isn't well done as far as seeing how it was done, most all of that is lost in the blur of the motion. >Brian > >------------------------------------------------------------------------- >This SF.net email is sponsored by: Microsoft >Defy all challenges. Microsoft(R) Visual Studio 2008. >http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ >_______________________________________________ >Emc-users mailing list >Emc-users@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/emc-users -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) I'm not proud. ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
