On 31.05.15 19:46, andy pugh wrote: > I am trying to decide whether to control spindle speed by setting up a > motor to twiddle the speed adjustment of the variator and leave the > VFD (which I need to synthesise 3-phase) at a fixed frequency, or > whether to leave the variator at a fixed setting and control speed > with the VFD.
Since both need to be in place anyway, I'd leave the variator controller for "later implementation", and vary with the VFD initially. Iff (If and only if) the low end torque doesn't suffice on a job, and you can't just manually set the variator once-off for the job, then the time for a variator controller has arrived. Perhaps a couple of steps would suffice, and could be treated as a gearbox? That's sacrilegious treatment of a variator, I suspect - and I notice that you have more round-tuits that I do, so a motorised handle-winder may not be so much of a hold-up there. (Stepper, driver, and a bit of HAL?) Erik (Who's just had his first go at stainless steel, and though it ate small abrasive cut-off wheels at a prodigious rate, TCT tooling thinks it's cheese.) ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
