> -----Original Message----- > From: Ken Strauss [mailto:[email protected]] > Sent: November-25-19 4:24 PM > To: 'Enhanced Machine Controller (EMC)' > Subject: Re: [Emc-users] Helical Gears > > Perhaps I'm not looking at things the right way. Assuming that the A-axis is > horizontal and the spindle axis is perpendicular to the x/y-axis, I don't > think that "You could use compound motion _if_ you also rotate the indexer > relative to the table slots." will avoid distortion of the tooth form. >
I think that's why some of the videos have the indexer pitched upwards or else the mill spindle not perpendicular. But those are all systems that don't use CNC which can move 3 or 4 axis simultaneously. But physics is physics and if the cutting tool has to be angled relative to the cutting surface it may require something to be tilted. Which in effect the X axis is on a horizontal mill. Still having trouble getting my head around that. John > > -----Original Message----- > > From: Andy Pugh [mailto:[email protected]] > > Sent: Monday, November 25, 2019 6:18 PM > > To: Enhanced Machine Controller (EMC) > > Subject: Re: [Emc-users] Helical Gears > > > > > > > > > On 25 Nov 2019, at 20:09, John Dammeyer <[email protected]> > > wrote: > > > > > > Or does the X axis even need to be pivoted? Can X and Y motion be co- > > ordinated to do the same thing or does the table physically have to > present > > the gear blank to the cutter with an angle as in the pivoting table? > > > > I take it you are talking about gear hobbing not cutting teeth one at a > time? > > https://m.youtube.com/watch?v=ZhICrb0Tbn4&t=44s > > > > https://m.youtube.com/watch?v=PFTHY5U8v-U > > > > I think that the blank needs to be presented to the job at the correct > angle of > > the tooth form will be distorted due to the length of the engagement. > > You could use compound motion _if_ you also rotate the indexer relative > to > > the table slots. > > A swinging table will have the advantage of angle graduations. > > I do have a plan for a micrometer stop to set mine to the exact angle. > With a > > cunningly-shaped contact block a mm micrometer can be made to read > direct > > degrees. I have it all designed and the parts bought. But, well, you know > how > > it is. > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
