Re: [CAD_CAM_EDM_DRO] Re: Re: I'm impressed - and a GCode question.

Alan, It sound to me you are seeing things that are not there. All the
curves I can see are the result of a intersection of simple bored holes at
90 degrees to each other. Lathe bored or CNC milled, the result will be the
same.

Graham

----- Original Message -----
From: "Alan Rothenbush" <beer@s...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, February 03, 2002 9:16 AM
Subject: [CAD_CAM_EDM_DRO] Re: Re: I'm impressed - and a GCode question.


>
> A dovetail cutter, yes, certainly with extra relief.
>
> A flycutter, yes, again, with appropriate relief.
>
> And both under CNC control. Mind you, the GCode to do such a thing
> escapes me. A LONG series of appropriate G02 commands with SMALL Z
> increments could do it, I suppose. I'd think that there would be some
> decided "staircasing", no matter how fine the Z move.
>
> This brings up another related GCode question. Say you took your
dovetail
> cutter and ground it like so < instead of the standard /_ , with the
> angle now being 60 degrees.
>
> Is it possible to use this cutter in a mill and program the GCode to
> cut a thread ( more than just a single rotation ) all in one go ? I
only
> know of G02/G03 commands, and they're limited to 360 degrees, aren't
they ?
>
> To cut 10 threads, you'd need to tell the G02 command to rotate 3600
> degrees ...
>
> There would also be finish problems as a result of the discontinuous cut,
> but continuous motion. Again, I guess with a SLOWWWW feed rate, this
could
> be minimized.
>
> Still sounds like a job for the lathe, though.
>
> An endmill ( which was the initial "boast" <G> ), is a no.
>
> Alan
>
> >
> >Dovetail cutter. Extra relief ground in if needed.
> >
> >Hope this helps.
> >
> >Ballendo
> >
> >--- In CAD_CAM_EDM_DRO@y..., Alan Rothenbush <beer@s...> wrote:
> >Have a closer look. The insides of the cube are curved. Can't for
> >the life of me figure out how to do that with an endmill and a three
> >axis machine.
> >
> > The cube was almost certainly bored on a CNC lathe, with the boring
> tool
> > taking a curved path as it proceeds through the piece.
>
> --
>
> Alan Rothenbush | The Spartans do not ask the number of the
> Academic Computing Services | enemy, only where they are.
> Simon Fraser University |
> Burnaby, B.C., Canada | Agix of Sparta
>
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