This is exactly how most people would make one-off helical gears. Just use a ball-end mill. No angled axis or other custom involute tools are needed. The video shows a Tormach mill doing just this, gear cutting with a ball-end.
I cheat. What I have found is that Boston Grear, McMaster Carr and others like them all have every stock gear they sell available as is STEP file. You can download the file and change the bore-hole, keyway or face width. It only takes a few minutes to modify a working gear design and you don't even have to know what "involute" or "module" means as that was done for you. But so far I've only printed these gears. I have actually generated the G code for milling to see if it could be done. Yes, but it would take a long time and a high-quality small mill. The bottom line is that on CNC machine the need for skill and advanced knowledge is gone. Just download a stock gear from McMaster Carr and then tell Fusion to make a g-code file for either printing or milling. Where some skills are still required is if you need to make 100,000 gears at minimum cost. The engineers who figure this out, they earn their pay many times over. On Mon, Nov 25, 2019 at 1:28 PM Ken Strauss <[email protected]> wrote: > > Is https://www.youtube.com/watch?v=6rsKuE90rjE what you mean? > That is a personal video but there are others on YouTube if you search for > "helical gear CNC" > > > -----Original Message----- > > From: Gene Heskett [mailto:[email protected]] > > Sent: Monday, November 25, 2019 3:33 PM > > To: [email protected] > > Subject: Re: [Emc-users] Helical Gears > > > > On Monday 25 November 2019 14:09:00 John Dammeyer wrote: > > > > > I'm not even close to being able to do this yet but I've been perusing > > > youtube videos and I have a question. > > > > > > https://www.grizzly.com/products/Grizzly-9-x-39-2-HP-Horizontal-Vertic > > >al-Mill-with-Power-Feed/G0757 > > > > > > This particular Grizzly mill like the older G3617 has a horizontal > > > mill feature and the ability to rotate the X axis table. There are a > > > number of videos out there that show that when the rotary indexer is > > > coupled with gearing to the X axis drive and the table is pivoted to > > > say 20 degrees that the horizontal mill with a gear cutter can turn > > > out helical gears. Doesn't look like any sort of spindle coupling is > > > needed. > > > > > > Now change to a LinuxCNC controlled "A" Axis Rotary Indexer and a > > > pivoted X axis table the indexer could be slaved to the X axis in > > > software to accomplish the same thing. Is that correct? > > > > > > 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? > > > > > > If simultaneous motion does duplicate the angled table, then if the > > > gear cutter is in the spindle will co-ordinated X,Z and A result in > > > the same thing as the gear driven helical gear cutting? > > > > > > And how would you even write G-Code to do this? > > > > > > Just curious at the moment. > > > > > > Thanks > > > John > > > > Offhand, I've not done it either, but it seems to me that Y could be > > moved at the angle needed by arriving at the y distance as being the > > angle derived from the X distance as a transcendental function, but z > > would also need to be moved up and down. That would then be a g2 or g3 > > function whose radii was half the diameter of the gear. I think I'd cut > > a lot of air verifying it though. > > > > Next question: short of having a handfull of the tool custom ground, > > where would you get a suitable tool? I've not seen such a critter for > > sale. > > > > Another possibility would be rotation of the co-ordinate map so as the > > make successive teeth by a step shift of x. Or better yet a nice rigid > > rotary table, with which I have made the spiral flutes of an emergency > > drill bit with. Mine weren't all that precise because the table is a > > POS from India, but it did get the job done, as in how precise do you > > have to be when drilling construction treated wood? Not very. > > > > Just throwing it out there, no clue if it will stick. ;-) > > > > > > > > > > > > > > > > > > "ELS! Nothing else works as well for your Lathe" > > > Automation Artisans Inc. > > > www dot autoartisans dot com > > > > > > > > > _______________________________________________ > > > Emc-users mailing list > > > [email protected] > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > Cheers, Gene Heskett > > -- > > "There are four boxes to be used in defense of liberty: > > soap, ballot, jury, and ammo. Please use in that order." > > -Ed Howdershelt (Author) > > If we desire respect for the law, we must first make the law respectable. > > - Louis D. Brandeis > > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > > > > _______________________________________________ > > 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 -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
