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