Re: [CAD_CAM_EDM_DRO] CNC turning

There is often confusion on orientation of lathe axes. The easiest way to
remember it is to visualise a milling machine lying on it's side. Of course,
on a simple lathe, there's no need for the Y axis.

But, with todays cnc machines and live tooling, there's Y, A, B, C axes and
lots of other letters of the alphabet.;)

Roland

On 2 February 2010 21:34, Andy Wander <awander@...> wrote:

>
>
> Hi Michael:
>
> The conventional axes on a lathe are the pooposite of what you have
> described. That is, +X is away from the workpiece centerline, -X is towards
> the workpiece centerline, +Z is away from the chuck, and -Z is towards the
> chuck.
>
> This fits the mill model also, as the Z is in line with the spindle axis on
> either lathe or mill.
>
> ______________________________________
> Andy Wander
>
>
> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com <CAD_CAM_EDM_DRO%40yahoogroups.com>[mailto:
> CAD_CAM_EDM_DRO@yahoogroups.com <CAD_CAM_EDM_DRO%40yahoogroups.com>] On
> Behalf Of Michael Fagan
> Sent: Tuesday, February 02, 2010 1:48 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com <CAD_CAM_EDM_DRO%40yahoogroups.com>
> Subject: Re: [CAD_CAM_EDM_DRO] CNC turning
>
> There really isn't anything different about a lathe than a mill. Just
> visualize the part as though in section (cut down the axis of rotation).
> From there it's just like milling, where x is towards and away from the
> headstock and z is towards and away from the centerline of the part. The
> location of the tool tip is typically referenced against the centerline of
> the part and the face. Since you can't actually touch off the centerline,
> you touch off the tool to the edge of a known diameter (either a gauge pin
> or your workpiece that you have measured with a micrometer) and then add or
> subtract the radius to get the centerline. Once you have it all set up, a
> rapid move in z followed by a feed move in x will turn the part to the
> radius equal to the z position. A rapid move in x followed by a feed move
> in z will face the part at that x location. To drill a hole, mount a drill
> in the toolpost and rapid to the centerline, then make a series of x moves
> as necessary. Depending on what your control supports, you may be able to
> use the canned cycles if you switch it to z axis moves instead of z axis
> (which is what you'd use in a mill).
>
> In order to thread on the lathe, you need a spindle encoder with an index
> pulse to sync the spindle and x axis feeds.
>
> On Tue, Feb 2, 2010 at 13:34, Jack <freshwatermodels@...<freshwatermodels%40yahoo.com>>
> wrote:
>
> >
> >
> >
> > Having built a cnc router and retrofiting CNC to a minimill I now want
> > to retrofit a lathe to cnc.
> >
> > I can accomplish the mechanical end of the conversion but I have never
> > worked with a cnc lathe or programming it.
> >
> > Does anyone know of any good web sites for learning about cnc lathe
> > operation and programing?
> >
> > Although I will most likely try to use either Lazycam or Visualmill to
> > generate toolpaths/G code I want to learn a little about manual
> > programing . Lazycam seems a bit cryptic and I will have to view the
> > tutorial intro a few times to see if I can figure it out. If not I
> > will opt for Visualturn.
> >
> > I watched one of the Mach3 tutorials but was more confused by it than
> > when I started.
> >
> > Any links and/or suggestions on how/where to learn about cnc turning
> > would be appreciated!
> >
> > Jack
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>
> ------------------------------------
>
>


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