Subject: Re: big stepper on ebay

Hi,

Use a microstep drive. Yes, it can work. I'd agree with Tim on all
other points.

Hope this helps.

Ballendo

--- In CAD_CAM_EDM_DRO@y..., "Tim Goldstein" <timg@k...> wrote:
> I don't think it would be a great modification. It would probably
work, but
> I would be concerned about 2 primary things:
> 1 - Large steppers tend to have relatively low maximum rpm. Small
lathes
> tend to like high rpm. If you use a belt drive to gear it up you
will have
> little torque. Also, just by the nature of steppers your torque
will drop
> rapidly with rpm so your top spindle speed regardless of how you
achieve it
> will not have a lot of power.
> 2 - At slower speed the motion of a stepper may tend to aggravate
chatter. A
> stepper does not have a smooth rotation at a fixed speed, but moves
in a
> series of steps. At lower rpm this would be most pronounced and is
> effectively full speed to the next step and then a pause followed
by a full
> speed move again.
>
> Only way to tell for sure is to get a motor and try it.
>
> Tim
> [Denver, CO]
>
> > -----Original Message-----
> > I am in the process of converting a taig lathe to cnc. My
> > question is can a
> > stepper motor of sufficient power be substituted for the AC
spindle drive
> > motor? That way with the proper DC power source the spindle
forward and
> > reverse and variable speed could be controlled by the computer.
> > Any and all
> > suggestions appriciated.
> > Thanks in advance. BILL.
> >
> > FAQ: http://www.ktmarketing.com/faq.html