Re: [CAD_CAM_EDM_DRO] CNC turning

Hi Roland and all:
     I just saw where they now use "W" as an axis on one of the new combination machines that do Hard Turning and Grinding on the same machine.  The "W" axis was like a second "X" axis but for the second head (Grinding) after the "X" was used for the Hard Turning.  From what I can find from my research the following hold true most of the time.    "A" is a head rotation
              "B" is a rotation axis parallel to the table (ex: index head or trunnion)
              "C" is a rotation axis perpendicular to the table or trunnion (ex: turntable)
              "I" is the starting point or offset in "X" from the center of an arc
              "J" is the starting point or offset in "Y" from the center of an arc
              "K" is the starting point or offset in "z" from the center of an arc
     Does anyone else know of anymore or a clearer definition of these?
                                                          GOD'S BLESSINGS
                                                              Bill

On Wed, 3 Feb 2010 08:55:43 +0200, Roland Jollivet wrote

>  
>
> 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]
> >
> > ------------------------------------
> >
> >
>
> [Non-text portions of this message have been removed]
>
>

--
Open WebMail Project (http://openwebmail.org)




[Non-text portions of this message have been removed]