I guess that if you're worried about the torque at low speeds I would keep the two systems together (VFD + the gearbox). You know more than me that with hal there's no trouble to make it work well.
Our Mazak has a two speed air actuated gearbox that has two fixed spur gears and another two that move. I don't like the system at all given the quality of the lathe because is really wear prone. Anyway that give us a low range of 0 to 1200 and the high range from 0 to 3000. The lathe uses the geabox in conjuntion with the vfd and works great and it's really notorious when you have to thread a big square thread that the second speed is not enough. We only use the low speed mostly since all of our finishing work is done on grinders. 2015-06-01 7:45 GMT-03:00 Mark Wendt <[email protected]>: > On Mon, Jun 1, 2015 at 6:41 AM, andy pugh <[email protected]> wrote: > > > On 1 June 2015 at 11:09, Mark Wendt <[email protected]> wrote: > > > Crikey! That's a beast! One can never have too much power. ;-) > > > > It's probably the most rigid 10x20 lathe ever made, but I was rather > > hoping for a discussion of the best way to control speed under CNC > > rather than a discussion of the lathe itself :-) > > > > -- > > atp > > If you can't fix it, you don't own it. > > http://www.ifixit.com/Manifesto > > > > Yeah, well, when you show a lathe with a power plant like that, what else > would you expect. ;-) > > Mark > > ------------------------------------------------------------------------------ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > -- *Leonardo Marsaglia*. ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
