On Sun, May 31, 2015 at 2:46 PM, andy pugh <[email protected]> wrote:
> I just bought a new old lathe, as an upgrade to the Cheap Chinese > Lathe. The new lathe actually has a smaller between-centres distance > than the CCL, only 1" more swing, but weighs about 12x as much. > > The drive-train is a 900 rpm motor, then a Kopp Variator, and then a > 2-speed electrically-actuated gearbox. > > 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. > > The advantage of the variator is that as you reduce the speed there is > more torque available, but that is not the case with a VFD. > > I suppose an alternative would be to swap the motor for a 240V > single-phase item and not have a VFD at all. > > The drive-train can be seen in this photo: > > https://picasaweb.google.com/lh/photo/bXi9y-7WGDJSi8r0Rhr6XH69jlxvlrTD6CexboMrrBE?feat=directlink > > It is fairly substantial. > > -- > atp > If you can't fix it, you don't own it. > http://www.ifixit.com/Manifesto > Crikey! That's a beast! One can never have too much power. ;-) Mark ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
