On Sat, 26 Dec 2020 at 19:34, John Dammeyer <jo...@autoartisans.com> wrote:
> Making a new lower pulley with 9 teeth is out of the question. It's too > small for only 9T and definitely won't fit on the 19mm motor shaft. And > that's the kicker. At almost 3/4" the pulley that goes onto it has to be > large enough to have a decent grip with set screws onto a 6mm key. I seem to recall that it is recommended to not go below 12T anyway. I don't know much about L and XL belts, all my machines have used T5. T5 is available in widths from 8mm to 25mm. https://www.bearingboys.co.uk/T5-Section-5mm-Pitch-1224-c I also have the correct hob for making custom T5 pulleys, so that is one reason for _me_ to use them. You could consider ignoring the keyway, especially if the motor shafts have a threaded hole in the end. I have several times taken inspiration from the Trantorque bushings: https://uk.rs-online.com/web/p/keyless-bushes/7542545/ However they require a huge central bore, so what I have done is machine the pulley bore with a taper and then pull or push in a sleeve. At various times I have used a bolt in the end of the shaft, a nut pulling the wedge through, or a ring of bolts to push the wedge in. Here is variation on the theme, with two tapers: https://bodgesoc.blogspot.com/2017/01/gears.html -- 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
