On Fri, 10 Jul 2020 at 02:00, Chris Albertson <albertson.ch...@gmail.com> wrote:
> Belts can go to about 6:1 at best a double belt reduction only goes to 36:1 I don't see why there is any limit to the possible reduction of a belt drive, if idlers are added to increase the wrap. If I was doing this (and this particular application is something that I have considered) I think that I would use a rotary variant of the "servobelt" system: Glue a length of T-section beliting to a circular component with the teeth pointing out to make a sprocket, and then have a close-spaced pair of rollers to keep the belt wrapped round the sprocket except for a short loop that pops out and wraps round the stepper pulley. > He is doing only > about 10 Hz. In that case I think that a user-space loop in something like Python would be fine, just monitor the time using an accurate RTC (GPS module?) and have the loop say "have I made as many pulses as I should have for this time of day?" and either make a pulse on a GPIO pin, or not, accordingly. -- 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
