On Thu, 18 Apr 2019 at 10:22, Roland Jollivet <roland.jolli...@gmail.com> wrote:
> To recap; small steppers 'drive' the carousel around to tighten the motor. No, the motor drives round the carousel to tighten the collet. It is really rather clever. Assuming that it can't work based purely on guess-work seems silly. I suggested a very simple test using the same torque wrench as Gene presumably uses now to tighten his collets to the correct torque to test the hypothesis. But, assuming a 5mm pitch screw and 5:1 motor reduction: (0.5 Nm stepper * (2 * pi) / 5mm ) * 5:1 = 3kN. On the end of a 75mm arm that is 235Nm. Correct torque for an ER20 is 75Nm. (Though I am not convinced that an ER17 can really lift a 300kg mass, so suspect I messed something up. ) -- 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, 1916 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
