Re: CNC lathe retrofit and phase converter

Carlos,


Q1: Do you have a taper attachment now?

There are two general types. One you have to disengage the nut or the
screw of the crosslide to use.

The other one may fit nicely into your plans; it's called a
telescoping screw crosslide taper attachment. In this type the
handwheel for the crosslide turns the screw, by means of a broached
spline. This allows the screw to "telescope"(extend and retract). The
SCREW is held in a fixed position at the REAR of the crosslide. The
handwheel turns the screw, the screw moves the nut, which moves the
crosslide. Now here's the good part; the "fixed" end of the screw is
attached to the taper jig. So moving the taper jig will move the
whole crosslide, EVEN THO' the screw is in place and the handwheel is
not moved. I realise this description may be hard to follow, but look
into telescoping taper attachments. A slight variation should allow
you to have a motor moving the crosslide, whilst preserving the use
of the handwheel (even WHILE the motor is moving the axis, if ya
want!) would makeit very easy to set/adjust crosslide zero reference.

On disengaging the l/s during cnc ops, try to have some sort of
physical lock. Habits are strong, and sure as the sun comes up, there
willcome a time when the l/s gets "activated" while the cnc is moving
the carriage... So make it "impossible" with a "safety" lock (like a
gun), or lever, or such. Even better if the cnc won't/can't start
til it's activated. Trust me on this one...

Hope this helps.

Ballendo

P.S. I'm sure others have answered the phase converter question
already. I'm late gettin' here...

--- In CAD_CAM_EDM_DRO@y..., "Carlos Guillermo" <carlos@v...> wrote:
> Hi all -
>
> Question #1:
> I am wondering what the best approach would be to retrofit my
> newly acquired Sharp 13x30 lathe to CNC. For the carriage feed,
> I'd like to run a ballscrew and disengage the leadscrew during CNC
> use. But, can I handle the cross-slide similarly? Could I learn
> something from taper attachments? How do they work as far as
> cross slide motion?
>