Re: CNCing a Logan Lathe

thanks for the responses....

This lathe does not have the lead screw or quick change box (who
knows where they went?) but I plan on using a ball screw for moving
the carriage. Logan has a "T - slot turret carriage" that can be
found that will allow multiple toolholders which I will likely use a
ball screw for it also. If I find a 4 position turret post, I would
like to incorporate it.

The lathe does have its power system in place with a three phase
motor to drive it...again something easily incorporated into the CNC
scheme. It also uses a belt drive which I consider to be an useful
safety link in case of a crash.

You make some very good points about the speed sensing capability.

Has anyone done a lathe like this...I would rather not "reinvent the
wheel".

TMT

-- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
<dave_mucha@...> wrote:

>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "too_many_tools"
> <too_many_tools@> wrote:
> >
> > I have access to a Logan 11" lathe that while missing some parts

would

> > be a candidate for CNC conversion.
> >
> > If it was yours, how would you convert it to CNC?
> >
> > What manufacturers would you use for the conversion?
> >
> > Are there any other modified 10"-12" lathes that you would use as

a

> > model for the conversion?
> >
> > Thanks
> >
> > TMT
>
>
> Change the ACME screw to ball bearing mount, maybe keep the ACME and
> use Moglice on the half nuts if the ACME was in great shape. if

not,

> swap it out for a real leadscrew or a ball screw.
>
> Ditto the cross slide.
>
> put a VSD on the motor with feedback to have a near constant RPM,

but

> numerical control
>
> a spindle speed sensor
>
> Coolant and a near full coolant lathe enclosure.
>
> pipe oil lines to all the places needed, and to an oil pump.
>
> Depending on the work to be performed, I'd considder steppers or
> servos. and also on the work to be performed, a spindle torque

sensor.

>
> this last item would indicate a dull tool.
>
> If the unit does not have a Tee slot cross slide, I'd also considder
> that. a cutoff tool can be mounted on the far side, as well as

other

> tooling on the Tee slots.
>
> alternativly, a 4 postion turret tool post. Not sure if they make
> these, or if you'd have to design it. but that or a tool changing
> system of some sort.
>
> Dave
>