Re: [CAD_CAM_EDM_DRO] EMC Lathe mode.

Thanks Doug:

Maybe I'm gonna have to add lathe mode to my ever growing list. Does
anyone sell a simple optical sensor that sticks on a lathe and pulses every
time a painted dot or something passes it, that should be all thats required
shouldn't it? Or am I missing something?

Art
http://users.andara.com/~fenerty/master.htm

----- Original Message -----
From: "Doug Fortune" <pentam@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, October 01, 2001 8:47 PM
Subject: Re: [CAD_CAM_EDM_DRO] EMC Lathe mode.


> Art Fenerty wrote:
> >
> > I seem to be hearing from a few people lately who would
> > like to see lathe capability added to my software. Since
> > it is based very much on the EMC code kernel, I thought
> > I'd ask the EMC guru's what would be required to add lathe
> > capability.
>
> No big deal for the basic lathe operation. The machine tool
> itself doesn't even know it is a lathe!
>
> The Z axis is parallel to the spindle/chuck (as always).
> -Z goes toward the chuck ( usually left)
> +Z goes away from the chuck (usually right)
>
> The X axis goes perpendicular to the chuck center line
> +X goes away (usually up and back on a CNC lathe, opposite
> to a manual lathe where the tool is in front)
> -X goes toward the centerline
>
>
> > I have never used a lathe CNC before, what is necessary?
>
> In its most basic, just X & Z
> Next, spindle on/off and limit sensing (coolant control, etc)
> Further, spindle rpm sensing is nice.
> Most CNC lathes have one or more turrets, so to change tools,
> the turret motor needs to be controlled.
>
> >what would be nice?
>
> Not only spindle rpm sensing, but also exact spindle position,
> requiring an index pulse once per rev. You'd need this for threading.
>
> Lastly, it is ultimately desirable to control the spindle speed
> directly from the PC under program control. That way you can
> optimize cutting by controlling the speed of the surface cutting.
>
> As a super-bonus, going in with a digitizer to determine your
> exact cut (and hence re-set the tool dia & tool length offset
> in your tool table), and diving in one last time for that
> 'perfect cut' would be neat.
>
> Thats pretty much it. In summary, if you don't need threading,
> just your standard gcode interpreter running in 2 axis mode
> should work.
>
> Doug Fortune
> http://www.cncKITS.com
>
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