Here's the arbor which has a runout of under 0.0002" and the pulley blank was a tight sliding fit as it is on the 19mm motor shaft. http://www.autoartisans.com/mill/SpindlePulleyArbor.jpg
The Aloris tool holder ended up being turned a number of times along with different tools to get at each of the angles. Most of the time I used a 1/4" HSS tool bit cut flat on top for ACME threads. However the soft cast aluminium didn't really like that so I switched to one with a similar angle but with top rake. However I didn't have one for RH turning so I ended flipping the arbor a number of times. The end result is workable although I think it needs balancing since at 3000 RPM there's a enough vibration that it wants to vibrate and move on the table. But it's very minor. http://www.autoartisans.com/mill/SpindleMotorPulley-4.jpg The reason behind building this pulley was to bring the pulleys down far enough to mate with the existing 4 step spindle pulley that has a cone on the inside mating with the spindle bearing. The AC Servo goes where the idler was. This photo show that the first pulley I made was too short by one pulley width. And small enough that spindle speed was restricted to about 1500 RPM. http://www.autoartisans.com/mill/SpindleShortPulley.jpg Now I'll get 1:1 and 2:1 with the two. Thanks for all the suggestions. John > -----Original Message----- > From: andy pugh [mailto:bodge...@gmail.com] > Sent: July-03-20 4:58 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Turning a pulley. > > On Sat, 4 Jul 2020 at 00:52, John Dammeyer <jo...@autoartisans.com> wrote: > > > > This isn't as much of a CNC question but more of a tool shape and > > positioning question. > > http://www.autoartisans.com/mill/SpindleMotorPulley-3.jpg > > It looks like a job for a (left handed) parting tool and the compound > slide (or CNC equivalent) > > But that might be what you are doing. What are you doing? > > -- > atp > "A motorcycle is a bicycle with a pandemonium attachment and is > designed for the especial use of mechanical geniuses, daredevils and > lunatics." > � George Fitch, Atlanta Constitution Newspaper, 1912 > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
