Ah. Found this one for setting angles with a micrometer. https://www.youtube.com/watch?v=91m7q3-oWKI
which was linked from http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Hobbing more reading required. So much to learn. But after tramming the head (still off maybe 0.0005") the surface finish on random aluminium raw material casting is quite nice. http://www.autoartisans.com/mill/TestFlycut_3.jpg Especially since I touched up the cutter to have a nicer profile after researching the net. http://www.autoartisans.com/mill/TestFlycut_4.jpg John > -----Original Message----- > From: John Dammeyer [mailto:[email protected]] > Sent: May-22-20 5:36 PM > To: 'Enhanced Machine Controller (EMC)' > Subject: Re: [Emc-users] CNC Helical Gear Cutting -- was RE: Face Milling > > > > And with a single point gear using LinuxCNC. This looks to be the most > > > complicated. > > > https://youtu.be/SJQtx80euGM > > > > If course, there is also the option of hobbing. > > https://youtu.be/xdE46yvckbM > > > > To make a helical you just need to swing the table further and feed a > > bit of X travel into the A position with some HAL magic. > > > > A swinging table isn't strictly necessary, you could use compound > > motions, but you do need the gear axis in the right direction, so > > would need to set the head and tailstock at an angle to the T-slots. > > Impressive video. Interesting how you set the angle precisely. The thought > that went into building that attachment is also pretty > cool. > > So for LinuxCNC, if you have the A Axis and an encoder on the horizontal > spindle, how do you tell the system to hob the gear? Just > curious. Nowhere near being able to do this yet. Don't even have my > Harmonic Drive operational nor an encoder on the spindle. > And my mill has the rotatable X axis but no horizontal feature. > > You mentioned the program you wrote so you can derive the numbers. But > ultimately what does the G-Code look like for > hobbing that gear? Is there a feature in the G-code for LinuxCNC that lets > you slave the A axis to the Spindle with a specific ratio? > > Sorry for the ignorant questions. Don't even know what to google to get > these answers. As in I don't know what I don't know. > > John > > > > > > > _______________________________________________ > 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
