On Wed, Jan 20, 2016, at 06:17 PM, andy pugh wrote: > On 15 January 2016 at 14:59, andy pugh <[email protected]> wrote: > > > It's an interesting device, and I think I have repaired it. Pictures here: > > > > http://bodgesoc.blogspot.co.uk/2016/01/holbrook6.html > > And the latest is that the Variator now seems to work: > https://www.youtube.com/watch?v=0uGYNYR-6SA > > But I have made a bracket to not use it: > https://picasaweb.google.com/108164504656404380542/Holbrook#6242003069535317714 >
If it works, and you expect it to continue to work, why not use it? You will have more HP delivered to the spindle over the full speed range than if you were to use only the VFD and 2-speed box. That control shaft turns easily - looks like a NEMA 23 stepper would have no trouble controlling it. Although I guess sequencing is a challenge, can only adjust while running. Are there clutches downstream of the variator? I'd be tempted to rig a crude low PPR encoder on the output shaft of the variator, start the motor with clutches off, adjust variator to desired gearbox input speed, then close either the high or low range clutch to start the spindle. Although I guess you would rather have the gentle acceleration (and dynamic braking) that comes from starting and stopping with the VFD instead of the clutches. OK, I'm starting to understand your decision :-) -- John Kasunich [email protected] ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
