On Sat, 26 Dec 2020 at 16:49, Gene Heskett <ghesk...@shentel.net> wrote:
> Two additional questions. That 70 ohm 300 watt braking resistor just > walked up and rang my doorbell, so are you using one? I am not using one. It would be useful if I was, since I added on-the-fly gearshifting to the two speed box. The idea is that if it is in low gear and the spindle speed goes above 500 rpm then it disconnects the low-speed clutch and slows the motor down to the right speed to operate the high-speed clutch. Unfortunately the spindle slows faster than the motor, so they only really catch each other at zero-zero. If I had a braking resistor then I could slow the motor faster, and there would be more chance of catching the gear change. But the VFD is next to the motor, behind a panel that is only accessible once the lathe is pulled away from the wall. So I have not tried to add one. Downshifting goes a little better. I drive an old fire engine that has the same problem, if you are going up a steep hill, that the vehicle could climb in top or third gear, if you have to stop and go into first, there is no way to get out of first and you have to hold it to the top of the hill. -- 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
