Re: [CAD_CAM_EDM_DRO] Thread milling

Hi Drew:
My machine has a dedicated helical interpolation G code for right hand
helices (G12) and left hand helices (G13).
I think the Okuma control just needs a G02 or a G03 with a Z level change in
the same line to do a single helical turn.
I'm not sure about this but I think it needs a counter in the program to
generate multiple turns.
Other controls I have no idea.

Cheers

Marcus

----- Original Message -----
From: Drew Rogge <drew@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, March 29, 2001 12:54 PM
Subject: [CAD_CAM_EDM_DRO] Thread milling


> There was a discussion a while ago about thread milling but after
> talking my cousin into trying it on his CNC machine I realized
> that I don't know if there's a straight forward way of doing it.
> I first thought that all there was to it was to do a couple of
> circular interpolations in XY while ramping down in the Z. Now
> I'm wondering how one programs the arcs with G02/3 while ramping
> the Z with a G01. Is there an easy way to do this or do you have
> to approximate the arcs with a bunch of short lines?
>
> Thanks,
> Drew
>
> --
> Drew Rogge